HSD3B7

UniProt ID: Q9H2F3
Organism: Homo sapiens
Review Status: INITIALIZED
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Gene Description

HSD3B7 (3 beta-hydroxysteroid dehydrogenase type 7; 3-beta-hydroxy-Delta(5)-C27-steroid oxidoreductase, EC 1.1.1.181) catalyzes the second committed step of bile-acid biosynthesis. Acting on the 7-alpha-hydroxylated sterols generated by CYP7A1/CYP7B1, it oxidizes the 3-beta-hydroxyl group and isomerizes the Delta5 double bond, converting 7-alpha-hydroxycholesterol (and related 7-alpha-hydroxy-oxysterols such as 7-alpha,25-, 7-alpha,26- and 7-alpha,24-triols) to the corresponding 3-oxo-Delta4 intermediates, e.g. 7-alpha-hydroxy-4-cholesten-3-one. A single such enzyme feeds all known pathways of bile-acid synthesis. It is specific for C27 bile-acid-precursor sterols and does not metabolize the C19/C21 steroids handled by the steroidogenic paralogs HSD3B1/HSD3B2 (with which it shares only ~34% identity). HSD3B7 is a multi-pass endoplasmic-reticulum-membrane (microsomal) enzyme expressed predominantly in liver. Loss-of-function mutations cause congenital bile acid synthesis defect type 1 (CBAS1), presenting as neonatal cholestasis, progressive liver disease and fat-soluble-vitamin malabsorption. By acting on the oxysterol 7-alpha,25-dihydroxycholesterol, the enzyme also contributes to turnover of the EBI2/GPR183 ligand that positions lymphocytes in lymphoid tissue.

Existing Annotations Review

GO Term Evidence Action Reason
GO:0016616 oxidoreductase activity, acting on the CH-OH group of donors, NAD or NADP as acceptor
IBA
GO_REF:0000033
MODIFY
Summary: Broad phylogenetically-inferred molecular-function term correctly placing HSD3B7 as an NAD(P)-dependent dehydrogenase acting on a CH-OH group. This is accurate but general; the specific activity is the 3-beta-hydroxy-Delta5-steroid dehydrogenase reaction on 7-alpha-hydroxylated C27 sterols.
Reason: The IBA term is correct at the family level but too general for a gene with a demonstrated specific catalytic activity. Retain the parent but propose the specific dehydrogenase terms already supported by experiment (GO:0003854, GO:0047016) as the core molecular function.
Propagation Review
Root cause: TERM SCOPING PROBLEM
Failure modes: GRANULARITY MISMATCH
Sources checked:
PANTHER:PTN000041225 · 3-beta-HSD family node (GO_Central IBA) SUPPORTS TRANSFER
Family-level IBA correctly assigns the general NAD(P)-dependent CH-OH dehydrogenase activity, but HSD3B7 has a demonstrated more specific 3-beta-hydroxy-Delta5-C27-steroid dehydrogenase activity (PMID:11067870).
Supporting Evidence:
file:human/HSD3B7/HSD3B7-uniprot.txt
HSD VII is active
GO:0005789 endoplasmic reticulum membrane
IEA
GO_REF:0000044
ACCEPT
Summary: HSD3B7 is a multi-pass endoplasmic reticulum membrane (microsomal) protein; this UniProt SubCellular-mapping IEA correctly captures the primary localization.
Reason: The ER membrane localization is directly stated in UniProt (SUBCELLULAR LOCATION) and consistent with the microsomal enzyme described in PMID:11067870 and with the two predicted transmembrane helices. This is a core aspect of the annotation.
Supporting Evidence:
file:human/HSD3B7/HSD3B7-uniprot.txt
Endoplasmic reticulum membrane; Multi-pass
GO:0006694 steroid biosynthetic process
IEA
GO_REF:0000120
MODIFY
Summary: Broad biosynthetic-process term. HSD3B7 participates in steroid (sterol/bile-acid) biosynthesis, so the term is not wrong, but the specific and better-supported process is bile acid biosynthesis (GO:0006699).
Reason: Bile-acid precursors are C27 sterols and the enzyme is specific for the bile-acid pathway; the more informative process term GO:0006699 is preferred. The broad steroid-biosynthesis term is retained conceptually but should be specialized.
Proposed replacements: bile acid biosynthetic process
Supporting Evidence:
file:human/HSD3B7/HSD3B7-uniprot.txt
Lipid metabolism; steroid biosynthesis
GO:0016616 oxidoreductase activity, acting on the CH-OH group of donors, NAD or NADP as acceptor
IEA
GO_REF:0000120
MODIFY
Summary: Same broad dehydrogenase molecular-function term as the IBA annotation, here from InterPro/ARBA. Correct but general.
Reason: Correct family-level assignment (NAD(P)-dependent CH-OH oxidoreductase), but a more specific term is warranted given the demonstrated 3-beta-hydroxy-Delta5-steroid dehydrogenase activity. Propose the specific MF terms.
Supporting Evidence:
file:human/HSD3B7/HSD3B7-uniprot.txt
HSD VII is active
GO:0047016 cholest-5-ene-3-beta,7-alpha-diol 3-beta-dehydrogenase activity
IEA
GO_REF:0000120
ACCEPT
Summary: Specific molecular-function term (EC 1.1.1.181) for the 3-beta-dehydrogenation of the 7-alpha-hydroxylated sterol cholest-5-ene-3-beta,7-alpha-diol (7-alpha-hydroxycholesterol). This is the demonstrated activity of HSD3B7 and is the core function; here inferred electronically but corroborated by experiment (PMID:11067870).
Reason: This is exactly the biochemically characterized activity of HSD3B7 acting on 7-alpha-hydroxycholesterol, matching the UniProt catalytic-activity entry (Rhea:11896, EC 1.1.1.181). Accept as a core molecular function.
Supporting Evidence:
PMID:11067870
active against four 7alpha-hydroxylated sterols
GO:0005515 protein binding
IPI
PMID:25416956
A proteome-scale map of the human interactome network.
MARK AS OVER ANNOTATED
Summary: Generic protein-binding annotation from a proteome-scale (HuRI/CCSB) binary interactome screen. The partner (SPRY2, O43597) is not part of a functionally characterized HSD3B7 complex, and the bare protein-binding term is uninformative about the enzyme's molecular function.
Reason: High-throughput interactome hits assigned only the uninformative GO:0005515 term. Per curation guidance, bare protein binding does not describe HSD3B7's catalytic function; this is retained as an over-annotation rather than removed, since the interaction data itself is experimental.
Supporting Evidence:
PMID:25416956
A proteome-scale map of the human interactome network
GO:0005515 protein binding
IPI
PMID:32296183
A reference map of the human binary protein interactome.
MARK AS OVER ANNOTATED
Summary: Generic protein-binding annotations from the HuRI binary interactome map, covering many heterogeneous partners (keratin-associated proteins, transcription factors, etc.). None represent a defined functional HSD3B7 complex, and the term is uninformative about molecular function.
Reason: These are large-scale yeast-two-hybrid/binary-screen hits annotated only to the bare GO:0005515 term. Not informative for HSD3B7's dehydrogenase function; marked as over-annotated per policy rather than removed.
Supporting Evidence:
PMID:32296183
A reference map of the human binary protein interactome
GO:0035754 B cell chemotaxis
IEA
GO_REF:0000107
KEEP AS NON CORE
Summary: Biological-process annotation transferred by Ensembl Compara from the mouse ortholog (Q9EQC1), reflecting HSD3B7's role in degrading the oxysterol 7-alpha,25-dihydroxycholesterol, an EBI2/GPR183 ligand that positions B cells in lymphoid tissue.
Reason: This is a genuine but downstream/physiological consequence inferred from the mouse ortholog, not HSD3B7's core catalytic role in bile-acid synthesis. The human enzyme does act on 7-alpha,25-OHC in vitro (UniProt catalytic activity Rhea:47156), supporting relevance, but the process is peripheral and evidence is by-similarity; keep as non-core.
Supporting Evidence:
file:human/HSD3B7/HSD3B7-uniprot.txt
Plays a key role in cell positioning and
GO:0006699 bile acid biosynthetic process
TAS
Reactome:R-HSA-193368
ACCEPT
Summary: HSD3B7 catalyzes the second step of the classic (neutral) bile-acid pathway via 7-alpha-hydroxycholesterol; Reactome annotates its participation in bile acid biosynthesis. This is a core biological process for HSD3B7.
Reason: Bile acid biosynthesis is the central, disease-defining role of HSD3B7, established biochemically and genetically (PMID:11067870). Accept as core.
Supporting Evidence:
PMID:11067870
a single C(27) 3beta-HSD enzyme can participate in all known pathways of bile acid synthesis
GO:0006699 bile acid biosynthetic process
TAS
Reactome:R-HSA-193775
ACCEPT
Summary: Participation in bile-acid/bile-salt synthesis via the 24-hydroxycholesterol (acidic/alternative) branch; HSD3B7 performs the 3-beta-dehydrogenation/isomerization step on the 7-alpha-hydroxylated 24-hydroxy sterol. Core bile-acid process annotation.
Reason: Duplicate of the core bile-acid biosynthetic process annotation, from a different Reactome pathway branch. Correct and core; the enzyme acts across all bile-acid pathway branches.
Supporting Evidence:
PMID:11067870
a single C(27) 3beta-HSD enzyme can participate in all known pathways of bile acid synthesis
GO:0006699 bile acid biosynthetic process
TAS
Reactome:R-HSA-193807
ACCEPT
Summary: Participation in bile-acid/bile-salt synthesis via the 27-hydroxycholesterol branch. HSD3B7 acts on the 7-alpha-hydroxylated 27-hydroxy sterol. Core bile-acid process annotation.
Reason: Duplicate of the core bile-acid biosynthetic process annotation from another Reactome branch. Consistent with the enzyme's broad substrate range across bile-acid pathways.
Supporting Evidence:
PMID:11067870
a single C(27) 3beta-HSD enzyme can participate in all known pathways of bile acid synthesis
GO:0003854 3-beta-hydroxy-Delta5-steroid dehydrogenase (NAD+) activity
TAS
Reactome:R-HSA-192097
ACCEPT
Summary: Core molecular function - NAD+-dependent 3-beta-hydroxy-Delta5-steroid dehydrogenase (with associated isomerase activity). Reactome R-HSA-192097 describes HSD3B7 oxidizing/isomerizing 7-alpha-hydroxycholesterol to 4-cholesten-7-alpha-ol-3-one.
Reason: This is the defining catalytic activity of HSD3B7, supported by biochemistry (PMID:11067870) and by the Reactome reaction. Accept as a core molecular function.
Supporting Evidence:
Reactome:R-HSA-192097
catalyzed by HSD3B7 (3 beta-hydroxysteroid dehydrogenase type 7) in the endoplasmic reticulum membrane
GO:0003854 3-beta-hydroxy-Delta5-steroid dehydrogenase (NAD+) activity
TAS
Reactome:R-HSA-193789
ACCEPT
Summary: Same core 3-beta-hydroxy-Delta5-steroid dehydrogenase activity, annotated from the Reactome reaction on cholest-5-ene-3beta,7alpha,24(S)-triol (the 24-hydroxy branch substrate).
Reason: Duplicate core molecular-function annotation from another Reactome reaction; correct and central to HSD3B7 function.
Supporting Evidence:
Reactome:R-HSA-193789
catalyzed by HSD3B7 (3 beta-hydroxysteroid dehydrogenase type 7) in the endoplasmic reticulum membrane
GO:0003854 3-beta-hydroxy-Delta5-steroid dehydrogenase (NAD+) activity
TAS
Reactome:R-HSA-193816
ACCEPT
Summary: Same core 3-beta-hydroxy-Delta5-steroid dehydrogenase activity, annotated from the Reactome reaction on cholest-5-ene-3beta,7alpha,27-triol (the 27-hydroxy branch substrate).
Reason: Duplicate core molecular-function annotation from another Reactome reaction; correct and central to HSD3B7 function.
Supporting Evidence:
Reactome:R-HSA-193816
in a reaction catalyzed by HSD3B7 (3 beta-hydroxysteroid dehydrogenase type 7) in the endoplasmic reticulum membrane
GO:0005811 lipid droplet
IDA
GO_REF:0000052
KEEP AS NON CORE
Summary: Immunofluorescence-based (HPA) localization to lipid droplets. HSD3B7's mechanistically-supported and primary compartment is the ER membrane; a lipid-droplet signal is plausible for an ER-associated lipid-metabolizing enzyme but is secondary.
Reason: The IDA/HPA lipid-droplet signal is a real immunolocalization observation but is not the primary functional compartment (ER membrane, multi-pass). Lipid droplets are ER-derived and this may reflect ER continuity; retain as non-core rather than treat as a core localization.
Supporting Evidence:
file:human/HSD3B7/HSD3B7-uniprot.txt
Endoplasmic reticulum membrane; Multi-pass
GO:0047016 cholest-5-ene-3-beta,7-alpha-diol 3-beta-dehydrogenase activity
EXP
PMID:11067870
The bile acid synthetic gene 3beta-hydroxy-Delta(5)-C(27)-st...
ACCEPT
Summary: Experimentally demonstrated activity - the expression-cloned C27 3beta-HSD acts on 7-alpha-hydroxylated sterols (cholest-5-ene-3-beta,7-alpha-diol, i.e. 7-alpha-hydroxycholesterol), catalyzing the 3-beta-dehydrogenation (EC 1.1.1.181). This is the specific, disease-relevant core molecular function.
Reason: Direct experimental evidence (transfection/activity assay) for this exact specific activity in the defining paper. Core molecular function.
Supporting Evidence:
PMID:11067870
active against four 7alpha-hydroxylated sterols
GO:0035754 B cell chemotaxis
ISS
GO_REF:0000024
KEEP AS NON CORE
Summary: Sequence-similarity transfer from the mouse ortholog (Q9EQC1) of the role in lymphocyte positioning via degradation of the EBI2/GPR183 ligand 7-alpha,25-dihydroxycholesterol.
Reason: Same physiological role as the Ensembl IEA annotation, here as manual ISS from mouse. Genuine but peripheral relative to HSD3B7's core bile-acid catalytic function, and inferred by similarity; keep as non-core.
Supporting Evidence:
file:human/HSD3B7/HSD3B7-uniprot.txt
Plays a key role in cell positioning and
GO:0047016 cholest-5-ene-3-beta,7-alpha-diol 3-beta-dehydrogenase activity
ISS
GO_REF:0000024
ACCEPT
Summary: Sequence-similarity transfer (from mouse Q9EQC1) of the specific 3-beta-dehydrogenase activity on 7-alpha-hydroxycholesterol. Corroborates the experimentally-established human activity.
Reason: The specific MF is independently demonstrated experimentally for the human enzyme (PMID:11067870); the ISS transfer is consistent and correct. Accept as core molecular function.
Supporting Evidence:
PMID:11067870
active against four 7alpha-hydroxylated sterols
GO:0005789 endoplasmic reticulum membrane
TAS
Reactome:R-HSA-192097
ACCEPT
Summary: ER-membrane localization asserted by Reactome for the HSD3B7-catalyzed reaction. Consistent with UniProt (multi-pass ER membrane) and the microsomal enzyme described in PMID:11067870. Core localization.
Reason: Correct and core; matches the authoritative UniProt subcellular location and the biochemistry (microsomal fraction).
Supporting Evidence:
Reactome:R-HSA-192097
catalyzed by HSD3B7 (3 beta-hydroxysteroid dehydrogenase type 7) in the endoplasmic reticulum membrane
GO:0005789 endoplasmic reticulum membrane
TAS
Reactome:R-HSA-193789
ACCEPT
Summary: Duplicate ER-membrane localization from another Reactome reaction for HSD3B7. Core localization.
Reason: Correct and core; consistent with UniProt subcellular location.
Supporting Evidence:
Reactome:R-HSA-193789
catalyzed by HSD3B7 (3 beta-hydroxysteroid dehydrogenase type 7) in the endoplasmic reticulum membrane
GO:0005789 endoplasmic reticulum membrane
TAS
Reactome:R-HSA-193816
ACCEPT
Summary: Duplicate ER-membrane localization from another Reactome reaction for HSD3B7. Core localization.
Reason: Correct and core; consistent with UniProt subcellular location.
Supporting Evidence:
Reactome:R-HSA-193816
in a reaction catalyzed by HSD3B7 (3 beta-hydroxysteroid dehydrogenase type 7) in the endoplasmic reticulum membrane
GO:0003854 3-beta-hydroxy-Delta5-steroid dehydrogenase (NAD+) activity
NAS
PMID:11067870
The bile acid synthetic gene 3beta-hydroxy-Delta(5)-C(27)-st...
ACCEPT
Summary: Non-traceable-author-statement assignment of the general 3-beta-hydroxy-Delta5-steroid dehydrogenase (NAD+) activity, sourced to the defining paper. Consistent with the experimentally-established specific activity.
Reason: The core dehydrogenase molecular function is well supported by the same paper's experiments (PMID:11067870). Accept.
Supporting Evidence:
PMID:11067870
active against four 7alpha-hydroxylated sterols
GO:0006699 bile acid biosynthetic process
TAS
PMID:11067870
The bile acid synthetic gene 3beta-hydroxy-Delta(5)-C(27)-st...
ACCEPT
Summary: The defining paper establishes HSD3B7's central role in bile-acid biosynthesis; TAS annotation of the core biological process. Loss of activity causes a bile-acid synthesis defect (CBAS1).
Reason: Central, disease-defining biological process supported directly by PMID:11067870. Accept as core.
Supporting Evidence:
PMID:11067870
establish the central role of C(27) 3beta-HSD in the biosynthesis of bile acids

Core Functions

NAD+-dependent 3-beta-hydroxy-Delta5-steroid dehydrogenase/isomerase that oxidizes the 3-beta-hydroxyl and isomerizes the Delta5 double bond of 7-alpha-hydroxylated C27 sterols (e.g. 7-alpha-hydroxycholesterol -> 7-alpha-hydroxy-4-cholesten-3-one), the second step of bile-acid biosynthesis.

Supporting Evidence:

Specific 3-beta-dehydrogenation of the 7-alpha-hydroxylated sterol cholest-5-ene-3-beta,7-alpha-diol (7-alpha-hydroxycholesterol), EC 1.1.1.181, the biochemically demonstrated bile-acid-precursor-specific activity of HSD3B7.

Supporting Evidence:

References

Manual transfer of experimentally-verified manual GO annotation data to orthologs by curator judgment of sequence similarity
Annotation inferences using phylogenetic trees
Gene Ontology annotation based on UniProtKB/Swiss-Prot Subcellular Location vocabulary mapping, accompanied by conservative changes to GO terms applied by UniProt
Gene Ontology annotation based on curation of immunofluorescence data
Automatic transfer of experimentally verified manual GO annotation data to orthologs using Ensembl Compara
Combined Automated Annotation using Multiple IEA Methods
file:human/HSD3B7/HSD3B7-uniprot.txt
UniProtKB Q9H2F3 (3BHS7_HUMAN) - 3 beta-hydroxysteroid dehydrogenase type 7
The bile acid synthetic gene 3beta-hydroxy-Delta(5)-C(27)-steroid oxidoreductase is mutated in progressive intrahepatic cholestasis.
A proteome-scale map of the human interactome network.
A reference map of the human binary protein interactome.
Reactome:R-HSA-192097
7alpha-hydroxycholesterol is oxidized and isomerized to 4-cholesten-7alpha-ol-3-one
Reactome:R-HSA-193368
Synthesis of bile acids and bile salts via 7alpha-hydroxycholesterol
Reactome:R-HSA-193775
Synthesis of bile acids and bile salts via 24-hydroxycholesterol
Reactome:R-HSA-193789
Cholest-5-ene-3beta,7alpha,24(S)-triol is oxidized and isomerized to 4-cholesten-7alpha,24(S)-diol-3-one
Reactome:R-HSA-193807
Synthesis of bile acids and bile salts via 27-hydroxycholesterol
Reactome:R-HSA-193816
Cholest-5-ene-3beta,7alpha,27-triol is oxidized and isomerized to 4-cholesten-7alpha,27-diol-3-one

📚 Additional Documentation

Notes

(HSD3B7-notes.md)

HSD3B7 (Q9H2F3) review notes

Human 3 beta-hydroxysteroid dehydrogenase type 7 / 3-beta-hydroxy-Delta(5)-C27-steroid
oxidoreductase (C27 3beta-HSD). EC 1.1.1.181. HGNC:18324. Chromosome 16p11.2-12.

Established biology (provenance)

  • Second enzyme of bile-acid biosynthesis. Acts on the 7alpha-hydroxylated sterols
    produced by CYP7A1/CYP7B1, oxidising the 3-beta-hydroxyl and isomerising the Delta5
    double bond so that 7alpha-hydroxycholesterol -> 7alpha-hydroxy-4-cholesten-3-one
    (a 3-oxo-Delta4 intermediate). Confirmed in vivo by loss-of-function disease
    [PMID:11067870 abstract, "a single C(27) 3beta-HSD enzyme can participate in all known
    pathways of bile acid synthesis"; Reactome R-HSA-192097 "7alpha-hydroxycholesterol and
    NAD+ react to form 4-cholesten-7alpha-ol-3-one, NADH, and H+, in a reaction catalyzed by
    HSD3B7"].
  • Substrate specificity is C27 bile-acid precursors, not steroidogenic C19/C21 steroids.
    Active against four 7alpha-hydroxylated sterols; does not metabolise C19/21 steroids
    [PMID:11067870, "active against four 7alpha-hydroxylated sterols"; "The expressed enzyme
    did not metabolize several different C(19/21) steroids as substrates"; UniProt Q9H2F3
    "HSD VII is active against four 7-alpha-hydroxylated sterols. Does not metabolize several
    different C(19/21) steroids as substrates"]. This distinguishes it from the steroidogenic
    paralogs HSD3B1/HSD3B2 (which it shares only 34% identity with).
  • Localisation: endoplasmic reticulum membrane, multi-pass. [UniProt Q9H2F3 SUBCELLULAR
    LOCATION "Endoplasmic reticulum membrane; Multi-pass membrane protein"; two predicted TM
    helices 289-309, 311-331; PMID:11067870 "microsomal"]. HPA reports a lipid-droplet IF
    signal (GO:0005811, IDA); ER is the primary, mechanistically-supported compartment.
  • Disease. Congenital bile acid synthesis defect type 1 (CBAS1, MIM:607765): neonatal
    cholestasis, progressive liver disease, fat-soluble-vitamin malabsorption
    [PMID:11067870; PMID:12679481, characterised loss-of-activity variant E147K].
  • B-cell / lymphocyte positioning (by similarity). Mouse ortholog Q9EQC1 degrades the
    EBI2/GPR183 ligand 7alpha,25-dihydroxycholesterol, shaping lymphoid chemotaxis gradients;
    human enzyme also acts on 7alpha,25-OHC in vitro (Rhea:RHEA:47156 in UniProt). The
    "B cell chemotaxis" (GO:0035754) annotations are transferred from mouse (ISS/IEA), a
    physiological consequence rather than the molecular function.

Molecular function / pathway ids (verified in local go.db)

  • GO:0003854 3-beta-hydroxy-Delta5-steroid dehydrogenase (NAD+) activity — core MF (GOA TAS Reactome; UniProt NAS).
  • GO:0047016 cholest-5-ene-3-beta,7-alpha-diol 3-beta-dehydrogenase activity (EC 1.1.1.181) — specific MF (GOA EXP PMID:11067870).
  • GO:0006699 bile acid biosynthetic process — core BP.
  • GO:0005789 endoplasmic reticulum membrane — core CC.
  • GO:0006694 steroid biosynthetic process — parent BP (IEA, retain as broad/non-core).
  • GO:0016616 oxidoreductase acting on CH-OH, NAD/NADP acceptor — parent MF (IBA/IEA).

Annotation judgments

  • Bare protein binding (GO:0005515) IPIs from the two high-throughput interactome maps
    (PMID:25416956 HuRI/CCSB; PMID:32296183 HuRI) are uninformative for function ->
    MARK_AS_OVER_ANNOTATED (not REMOVE, per policy; experimental HT screens, not verifiable
    as functional).
  • B cell chemotaxis (GO:0035754) ISS/IEA from mouse -> KEEP_AS_NON_CORE (real physiology,
    not HSD3B7's core catalytic role; transferred, not directly demonstrated in human).
  • lipid droplet (GO:0005811) IDA/HPA -> KEEP_AS_NON_CORE (IF localisation; ER membrane is
    the mechanistically-supported primary compartment).

📄 View Raw YAML

id: Q9H2F3
gene_symbol: HSD3B7
product_type: PROTEIN
status: INITIALIZED
taxon:
  id: NCBITaxon:9606
  label: Homo sapiens
description: HSD3B7 (3 beta-hydroxysteroid dehydrogenase type 7; 3-beta-hydroxy-Delta(5)-C27-steroid
  oxidoreductase, EC 1.1.1.181) catalyzes the second committed step of bile-acid biosynthesis.
  Acting on the 7-alpha-hydroxylated sterols generated by CYP7A1/CYP7B1, it oxidizes the
  3-beta-hydroxyl group and isomerizes the Delta5 double bond, converting 7-alpha-hydroxycholesterol
  (and related 7-alpha-hydroxy-oxysterols such as 7-alpha,25-, 7-alpha,26- and 7-alpha,24-triols)
  to the corresponding 3-oxo-Delta4 intermediates, e.g. 7-alpha-hydroxy-4-cholesten-3-one.
  A single such enzyme feeds all known pathways of bile-acid synthesis. It is specific for
  C27 bile-acid-precursor sterols and does not metabolize the C19/C21 steroids handled by
  the steroidogenic paralogs HSD3B1/HSD3B2 (with which it shares only ~34% identity). HSD3B7
  is a multi-pass endoplasmic-reticulum-membrane (microsomal) enzyme expressed predominantly
  in liver. Loss-of-function mutations cause congenital bile acid synthesis defect type 1
  (CBAS1), presenting as neonatal cholestasis, progressive liver disease and fat-soluble-vitamin
  malabsorption. By acting on the oxysterol 7-alpha,25-dihydroxycholesterol, the enzyme also
  contributes to turnover of the EBI2/GPR183 ligand that positions lymphocytes in lymphoid
  tissue.
alternative_products:
- name: '1'
  id: Q9H2F3-1
- name: '2'
  id: Q9H2F3-2
  sequence_note: VSP_042658
existing_annotations:
- term:
    id: GO:0016616
    label: oxidoreductase activity, acting on the CH-OH group of donors, NAD or NADP
      as acceptor
  evidence_type: IBA
  original_reference_id: GO_REF:0000033
  qualifier: enables
  review:
    summary: Broad phylogenetically-inferred molecular-function term correctly placing
      HSD3B7 as an NAD(P)-dependent dehydrogenase acting on a CH-OH group. This is
      accurate but general; the specific activity is the 3-beta-hydroxy-Delta5-steroid
      dehydrogenase reaction on 7-alpha-hydroxylated C27 sterols.
    action: MODIFY
    reason: The IBA term is correct at the family level but too general for a gene
      with a demonstrated specific catalytic activity. Retain the parent but propose
      the specific dehydrogenase terms already supported by experiment (GO:0003854,
      GO:0047016) as the core molecular function.
    proposed_replacement_terms:
    - id: GO:0003854
      label: 3-beta-hydroxy-Delta5-steroid dehydrogenase (NAD+) activity
    - id: GO:0047016
      label: cholest-5-ene-3-beta,7-alpha-diol 3-beta-dehydrogenase activity
    propagation_review:
      root_cause: TERM_SCOPING_PROBLEM
      failure_modes:
      - GRANULARITY_MISMATCH
      source_entities:
      - source_id: PANTHER:PTN000041225
        source_label: 3-beta-HSD family node (GO_Central IBA)
        source_status: SUPPORTS_TRANSFER
        comment: Family-level IBA correctly assigns the general NAD(P)-dependent CH-OH
          dehydrogenase activity, but HSD3B7 has a demonstrated more specific
          3-beta-hydroxy-Delta5-C27-steroid dehydrogenase activity (PMID:11067870).
    supported_by:
    - reference_id: file:human/HSD3B7/HSD3B7-uniprot.txt
      supporting_text: HSD VII is active
- term:
    id: GO:0005789
    label: endoplasmic reticulum membrane
  evidence_type: IEA
  original_reference_id: GO_REF:0000044
  qualifier: located_in
  review:
    summary: HSD3B7 is a multi-pass endoplasmic reticulum membrane (microsomal) protein;
      this UniProt SubCellular-mapping IEA correctly captures the primary localization.
    action: ACCEPT
    reason: The ER membrane localization is directly stated in UniProt (SUBCELLULAR
      LOCATION) and consistent with the microsomal enzyme described in PMID:11067870
      and with the two predicted transmembrane helices. This is a core aspect of the
      annotation.
    supported_by:
    - reference_id: file:human/HSD3B7/HSD3B7-uniprot.txt
      supporting_text: 'Endoplasmic reticulum membrane; Multi-pass'
- term:
    id: GO:0006694
    label: steroid biosynthetic process
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  qualifier: involved_in
  review:
    summary: Broad biosynthetic-process term. HSD3B7 participates in steroid (sterol/bile-acid)
      biosynthesis, so the term is not wrong, but the specific and better-supported
      process is bile acid biosynthesis (GO:0006699).
    action: MODIFY
    reason: Bile-acid precursors are C27 sterols and the enzyme is specific for the
      bile-acid pathway; the more informative process term GO:0006699 is preferred.
      The broad steroid-biosynthesis term is retained conceptually but should be specialized.
    proposed_replacement_terms:
    - id: GO:0006699
      label: bile acid biosynthetic process
    supported_by:
    - reference_id: file:human/HSD3B7/HSD3B7-uniprot.txt
      supporting_text: 'Lipid metabolism; steroid biosynthesis'
- term:
    id: GO:0016616
    label: oxidoreductase activity, acting on the CH-OH group of donors, NAD or NADP
      as acceptor
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  qualifier: enables
  review:
    summary: Same broad dehydrogenase molecular-function term as the IBA annotation,
      here from InterPro/ARBA. Correct but general.
    action: MODIFY
    reason: Correct family-level assignment (NAD(P)-dependent CH-OH oxidoreductase),
      but a more specific term is warranted given the demonstrated 3-beta-hydroxy-Delta5-steroid
      dehydrogenase activity. Propose the specific MF terms.
    proposed_replacement_terms:
    - id: GO:0003854
      label: 3-beta-hydroxy-Delta5-steroid dehydrogenase (NAD+) activity
    - id: GO:0047016
      label: cholest-5-ene-3-beta,7-alpha-diol 3-beta-dehydrogenase activity
    supported_by:
    - reference_id: file:human/HSD3B7/HSD3B7-uniprot.txt
      supporting_text: HSD VII is active
- term:
    id: GO:0047016
    label: cholest-5-ene-3-beta,7-alpha-diol 3-beta-dehydrogenase activity
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  qualifier: enables
  review:
    summary: Specific molecular-function term (EC 1.1.1.181) for the 3-beta-dehydrogenation
      of the 7-alpha-hydroxylated sterol cholest-5-ene-3-beta,7-alpha-diol (7-alpha-hydroxycholesterol).
      This is the demonstrated activity of HSD3B7 and is the core function; here inferred
      electronically but corroborated by experiment (PMID:11067870).
    action: ACCEPT
    reason: This is exactly the biochemically characterized activity of HSD3B7 acting
      on 7-alpha-hydroxycholesterol, matching the UniProt catalytic-activity entry (Rhea:11896,
      EC 1.1.1.181). Accept as a core molecular function.
    supported_by:
    - reference_id: PMID:11067870
      supporting_text: active against four 7alpha-hydroxylated sterols
- term:
    id: GO:0005515
    label: protein binding
  evidence_type: IPI
  original_reference_id: PMID:25416956
  qualifier: enables
  review:
    summary: Generic protein-binding annotation from a proteome-scale (HuRI/CCSB) binary
      interactome screen. The partner (SPRY2, O43597) is not part of a functionally
      characterized HSD3B7 complex, and the bare protein-binding term is uninformative
      about the enzyme's molecular function.
    action: MARK_AS_OVER_ANNOTATED
    reason: High-throughput interactome hits assigned only the uninformative GO:0005515
      term. Per curation guidance, bare protein binding does not describe HSD3B7's
      catalytic function; this is retained as an over-annotation rather than removed,
      since the interaction data itself is experimental.
    supported_by:
    - reference_id: PMID:25416956
      supporting_text: A proteome-scale map of the human interactome network
- term:
    id: GO:0005515
    label: protein binding
  evidence_type: IPI
  original_reference_id: PMID:32296183
  qualifier: enables
  review:
    summary: Generic protein-binding annotations from the HuRI binary interactome map,
      covering many heterogeneous partners (keratin-associated proteins, transcription
      factors, etc.). None represent a defined functional HSD3B7 complex, and the term
      is uninformative about molecular function.
    action: MARK_AS_OVER_ANNOTATED
    reason: These are large-scale yeast-two-hybrid/binary-screen hits annotated only
      to the bare GO:0005515 term. Not informative for HSD3B7's dehydrogenase function;
      marked as over-annotated per policy rather than removed.
    supported_by:
    - reference_id: PMID:32296183
      supporting_text: A reference map of the human binary protein interactome
- term:
    id: GO:0035754
    label: B cell chemotaxis
  evidence_type: IEA
  original_reference_id: GO_REF:0000107
  qualifier: involved_in
  review:
    summary: Biological-process annotation transferred by Ensembl Compara from the
      mouse ortholog (Q9EQC1), reflecting HSD3B7's role in degrading the oxysterol
      7-alpha,25-dihydroxycholesterol, an EBI2/GPR183 ligand that positions B cells
      in lymphoid tissue.
    action: KEEP_AS_NON_CORE
    reason: This is a genuine but downstream/physiological consequence inferred from
      the mouse ortholog, not HSD3B7's core catalytic role in bile-acid synthesis.
      The human enzyme does act on 7-alpha,25-OHC in vitro (UniProt catalytic activity
      Rhea:47156), supporting relevance, but the process is peripheral and evidence
      is by-similarity; keep as non-core.
    supported_by:
    - reference_id: file:human/HSD3B7/HSD3B7-uniprot.txt
      supporting_text: Plays a key role in cell positioning and
- term:
    id: GO:0006699
    label: bile acid biosynthetic process
  evidence_type: TAS
  original_reference_id: Reactome:R-HSA-193368
  qualifier: involved_in
  review:
    summary: HSD3B7 catalyzes the second step of the classic (neutral) bile-acid pathway
      via 7-alpha-hydroxycholesterol; Reactome annotates its participation in bile
      acid biosynthesis. This is a core biological process for HSD3B7.
    action: ACCEPT
    reason: Bile acid biosynthesis is the central, disease-defining role of HSD3B7,
      established biochemically and genetically (PMID:11067870). Accept as core.
    supported_by:
    - reference_id: PMID:11067870
      supporting_text: a single C(27) 3beta-HSD enzyme can
        participate in all known pathways of bile acid synthesis
- term:
    id: GO:0006699
    label: bile acid biosynthetic process
  evidence_type: TAS
  original_reference_id: Reactome:R-HSA-193775
  qualifier: involved_in
  review:
    summary: Participation in bile-acid/bile-salt synthesis via the 24-hydroxycholesterol
      (acidic/alternative) branch; HSD3B7 performs the 3-beta-dehydrogenation/isomerization
      step on the 7-alpha-hydroxylated 24-hydroxy sterol. Core bile-acid process annotation.
    action: ACCEPT
    reason: Duplicate of the core bile-acid biosynthetic process annotation, from a
      different Reactome pathway branch. Correct and core; the enzyme acts across all
      bile-acid pathway branches.
    supported_by:
    - reference_id: PMID:11067870
      supporting_text: a single C(27) 3beta-HSD enzyme can
        participate in all known pathways of bile acid synthesis
- term:
    id: GO:0006699
    label: bile acid biosynthetic process
  evidence_type: TAS
  original_reference_id: Reactome:R-HSA-193807
  qualifier: involved_in
  review:
    summary: Participation in bile-acid/bile-salt synthesis via the 27-hydroxycholesterol
      branch. HSD3B7 acts on the 7-alpha-hydroxylated 27-hydroxy sterol. Core bile-acid
      process annotation.
    action: ACCEPT
    reason: Duplicate of the core bile-acid biosynthetic process annotation from another
      Reactome branch. Consistent with the enzyme's broad substrate range across
      bile-acid pathways.
    supported_by:
    - reference_id: PMID:11067870
      supporting_text: a single C(27) 3beta-HSD enzyme can
        participate in all known pathways of bile acid synthesis
- term:
    id: GO:0003854
    label: 3-beta-hydroxy-Delta5-steroid dehydrogenase (NAD+) activity
  evidence_type: TAS
  original_reference_id: Reactome:R-HSA-192097
  qualifier: enables
  review:
    summary: Core molecular function - NAD+-dependent 3-beta-hydroxy-Delta5-steroid
      dehydrogenase (with associated isomerase activity). Reactome R-HSA-192097 describes
      HSD3B7 oxidizing/isomerizing 7-alpha-hydroxycholesterol to 4-cholesten-7-alpha-ol-3-one.
    action: ACCEPT
    reason: This is the defining catalytic activity of HSD3B7, supported by biochemistry
      (PMID:11067870) and by the Reactome reaction. Accept as a core molecular function.
    supported_by:
    - reference_id: Reactome:R-HSA-192097
      supporting_text: catalyzed by HSD3B7 (3 beta-hydroxysteroid
        dehydrogenase type 7) in the endoplasmic reticulum membrane
- term:
    id: GO:0003854
    label: 3-beta-hydroxy-Delta5-steroid dehydrogenase (NAD+) activity
  evidence_type: TAS
  original_reference_id: Reactome:R-HSA-193789
  qualifier: enables
  review:
    summary: Same core 3-beta-hydroxy-Delta5-steroid dehydrogenase activity, annotated
      from the Reactome reaction on cholest-5-ene-3beta,7alpha,24(S)-triol (the 24-hydroxy
      branch substrate).
    action: ACCEPT
    reason: Duplicate core molecular-function annotation from another Reactome reaction;
      correct and central to HSD3B7 function.
    supported_by:
    - reference_id: Reactome:R-HSA-193789
      supporting_text: catalyzed by HSD3B7 (3 beta-hydroxysteroid dehydrogenase type 7)
        in the endoplasmic reticulum membrane
- term:
    id: GO:0003854
    label: 3-beta-hydroxy-Delta5-steroid dehydrogenase (NAD+) activity
  evidence_type: TAS
  original_reference_id: Reactome:R-HSA-193816
  qualifier: enables
  review:
    summary: Same core 3-beta-hydroxy-Delta5-steroid dehydrogenase activity, annotated
      from the Reactome reaction on cholest-5-ene-3beta,7alpha,27-triol (the 27-hydroxy
      branch substrate).
    action: ACCEPT
    reason: Duplicate core molecular-function annotation from another Reactome reaction;
      correct and central to HSD3B7 function.
    supported_by:
    - reference_id: Reactome:R-HSA-193816
      supporting_text: in a reaction catalyzed by HSD3B7 (3 beta-hydroxysteroid
        dehydrogenase type 7) in the endoplasmic reticulum membrane
- term:
    id: GO:0005811
    label: lipid droplet
  evidence_type: IDA
  original_reference_id: GO_REF:0000052
  qualifier: located_in
  review:
    summary: Immunofluorescence-based (HPA) localization to lipid droplets. HSD3B7's
      mechanistically-supported and primary compartment is the ER membrane; a lipid-droplet
      signal is plausible for an ER-associated lipid-metabolizing enzyme but is secondary.
    action: KEEP_AS_NON_CORE
    reason: The IDA/HPA lipid-droplet signal is a real immunolocalization observation
      but is not the primary functional compartment (ER membrane, multi-pass). Lipid
      droplets are ER-derived and this may reflect ER continuity; retain as non-core
      rather than treat as a core localization.
    supported_by:
    - reference_id: file:human/HSD3B7/HSD3B7-uniprot.txt
      supporting_text: 'Endoplasmic reticulum membrane; Multi-pass'
- term:
    id: GO:0047016
    label: cholest-5-ene-3-beta,7-alpha-diol 3-beta-dehydrogenase activity
  evidence_type: EXP
  original_reference_id: PMID:11067870
  qualifier: enables
  review:
    summary: Experimentally demonstrated activity - the expression-cloned C27 3beta-HSD
      acts on 7-alpha-hydroxylated sterols (cholest-5-ene-3-beta,7-alpha-diol, i.e.
      7-alpha-hydroxycholesterol), catalyzing the 3-beta-dehydrogenation (EC 1.1.1.181).
      This is the specific, disease-relevant core molecular function.
    action: ACCEPT
    reason: Direct experimental evidence (transfection/activity assay) for this exact
      specific activity in the defining paper. Core molecular function.
    supported_by:
    - reference_id: PMID:11067870
      supporting_text: active against four 7alpha-hydroxylated sterols
- term:
    id: GO:0035754
    label: B cell chemotaxis
  evidence_type: ISS
  original_reference_id: GO_REF:0000024
  qualifier: involved_in
  review:
    summary: Sequence-similarity transfer from the mouse ortholog (Q9EQC1) of the role
      in lymphocyte positioning via degradation of the EBI2/GPR183 ligand 7-alpha,25-dihydroxycholesterol.
    action: KEEP_AS_NON_CORE
    reason: Same physiological role as the Ensembl IEA annotation, here as manual ISS
      from mouse. Genuine but peripheral relative to HSD3B7's core bile-acid catalytic
      function, and inferred by similarity; keep as non-core.
    supported_by:
    - reference_id: file:human/HSD3B7/HSD3B7-uniprot.txt
      supporting_text: Plays a key role in cell positioning and
- term:
    id: GO:0047016
    label: cholest-5-ene-3-beta,7-alpha-diol 3-beta-dehydrogenase activity
  evidence_type: ISS
  original_reference_id: GO_REF:0000024
  qualifier: enables
  review:
    summary: Sequence-similarity transfer (from mouse Q9EQC1) of the specific 3-beta-dehydrogenase
      activity on 7-alpha-hydroxycholesterol. Corroborates the experimentally-established
      human activity.
    action: ACCEPT
    reason: The specific MF is independently demonstrated experimentally for the human
      enzyme (PMID:11067870); the ISS transfer is consistent and correct. Accept as
      core molecular function.
    supported_by:
    - reference_id: PMID:11067870
      supporting_text: active against four 7alpha-hydroxylated sterols
- term:
    id: GO:0005789
    label: endoplasmic reticulum membrane
  evidence_type: TAS
  original_reference_id: Reactome:R-HSA-192097
  qualifier: located_in
  review:
    summary: ER-membrane localization asserted by Reactome for the HSD3B7-catalyzed
      reaction. Consistent with UniProt (multi-pass ER membrane) and the microsomal
      enzyme described in PMID:11067870. Core localization.
    action: ACCEPT
    reason: Correct and core; matches the authoritative UniProt subcellular location
      and the biochemistry (microsomal fraction).
    supported_by:
    - reference_id: Reactome:R-HSA-192097
      supporting_text: catalyzed by HSD3B7 (3 beta-hydroxysteroid
        dehydrogenase type 7) in the endoplasmic reticulum membrane
- term:
    id: GO:0005789
    label: endoplasmic reticulum membrane
  evidence_type: TAS
  original_reference_id: Reactome:R-HSA-193789
  qualifier: located_in
  review:
    summary: Duplicate ER-membrane localization from another Reactome reaction for
      HSD3B7. Core localization.
    action: ACCEPT
    reason: Correct and core; consistent with UniProt subcellular location.
    supported_by:
    - reference_id: Reactome:R-HSA-193789
      supporting_text: catalyzed by HSD3B7 (3 beta-hydroxysteroid dehydrogenase type 7)
        in the endoplasmic reticulum membrane
- term:
    id: GO:0005789
    label: endoplasmic reticulum membrane
  evidence_type: TAS
  original_reference_id: Reactome:R-HSA-193816
  qualifier: located_in
  review:
    summary: Duplicate ER-membrane localization from another Reactome reaction for
      HSD3B7. Core localization.
    action: ACCEPT
    reason: Correct and core; consistent with UniProt subcellular location.
    supported_by:
    - reference_id: Reactome:R-HSA-193816
      supporting_text: in a reaction catalyzed by HSD3B7 (3 beta-hydroxysteroid dehydrogenase type 7)
        in the endoplasmic reticulum membrane
- term:
    id: GO:0003854
    label: 3-beta-hydroxy-Delta5-steroid dehydrogenase (NAD+) activity
  evidence_type: NAS
  original_reference_id: PMID:11067870
  qualifier: enables
  review:
    summary: Non-traceable-author-statement assignment of the general 3-beta-hydroxy-Delta5-steroid
      dehydrogenase (NAD+) activity, sourced to the defining paper. Consistent with
      the experimentally-established specific activity.
    action: ACCEPT
    reason: The core dehydrogenase molecular function is well supported by the same
      paper's experiments (PMID:11067870). Accept.
    supported_by:
    - reference_id: PMID:11067870
      supporting_text: active against four 7alpha-hydroxylated sterols
- term:
    id: GO:0006699
    label: bile acid biosynthetic process
  evidence_type: TAS
  original_reference_id: PMID:11067870
  qualifier: involved_in
  review:
    summary: The defining paper establishes HSD3B7's central role in bile-acid biosynthesis;
      TAS annotation of the core biological process. Loss of activity causes a bile-acid
      synthesis defect (CBAS1).
    action: ACCEPT
    reason: Central, disease-defining biological process supported directly by PMID:11067870.
      Accept as core.
    supported_by:
    - reference_id: PMID:11067870
      supporting_text: establish the central role of C(27) 3beta-HSD in the
        biosynthesis of bile acids
core_functions:
- description: NAD+-dependent 3-beta-hydroxy-Delta5-steroid dehydrogenase/isomerase that
    oxidizes the 3-beta-hydroxyl and isomerizes the Delta5 double bond of 7-alpha-hydroxylated
    C27 sterols (e.g. 7-alpha-hydroxycholesterol -> 7-alpha-hydroxy-4-cholesten-3-one),
    the second step of bile-acid biosynthesis.
  molecular_function:
    id: GO:0003854
    label: 3-beta-hydroxy-Delta5-steroid dehydrogenase (NAD+) activity
  directly_involved_in:
  - id: GO:0006699
    label: bile acid biosynthetic process
  locations:
  - id: GO:0005789
    label: endoplasmic reticulum membrane
  supported_by:
  - reference_id: PMID:11067870
    supporting_text: active against four 7alpha-hydroxylated sterols
- description: Specific 3-beta-dehydrogenation of the 7-alpha-hydroxylated sterol
    cholest-5-ene-3-beta,7-alpha-diol (7-alpha-hydroxycholesterol), EC 1.1.1.181,
    the biochemically demonstrated bile-acid-precursor-specific activity of HSD3B7.
  molecular_function:
    id: GO:0047016
    label: cholest-5-ene-3-beta,7-alpha-diol 3-beta-dehydrogenase activity
  directly_involved_in:
  - id: GO:0006699
    label: bile acid biosynthetic process
  locations:
  - id: GO:0005789
    label: endoplasmic reticulum membrane
  supported_by:
  - reference_id: PMID:11067870
    supporting_text: active against four 7alpha-hydroxylated sterols
references:
- id: GO_REF:0000024
  title: Manual transfer of experimentally-verified manual GO annotation data to orthologs
    by curator judgment of sequence similarity
  findings: []
- id: GO_REF:0000033
  title: Annotation inferences using phylogenetic trees
  findings: []
- id: GO_REF:0000044
  title: Gene Ontology annotation based on UniProtKB/Swiss-Prot Subcellular Location
    vocabulary mapping, accompanied by conservative changes to GO terms applied by
    UniProt
  findings: []
- id: GO_REF:0000052
  title: Gene Ontology annotation based on curation of immunofluorescence data
  findings: []
- id: GO_REF:0000107
  title: Automatic transfer of experimentally verified manual GO annotation data to
    orthologs using Ensembl Compara
  findings: []
- id: GO_REF:0000120
  title: Combined Automated Annotation using Multiple IEA Methods
  findings: []
- id: file:human/HSD3B7/HSD3B7-uniprot.txt
  title: UniProtKB Q9H2F3 (3BHS7_HUMAN) - 3 beta-hydroxysteroid dehydrogenase type 7
  findings: []
- id: PMID:11067870
  title: The bile acid synthetic gene 3beta-hydroxy-Delta(5)-C(27)-steroid oxidoreductase
    is mutated in progressive intrahepatic cholestasis.
  findings: []
  reference_review:
    relevance: HIGH
    correctness: VERIFIED
    review_notes: PubMed-verified defining paper; expression cloning shows the C27
      3beta-HSD acts on four 7-alpha-hydroxylated sterols, does not metabolize C19/21
      steroids, and that loss of activity causes neonatal cholestasis. Abstract-only
      in cache (full_text_available false); quotes taken verbatim from the abstract.
- id: PMID:25416956
  title: A proteome-scale map of the human interactome network.
  findings: []
  reference_review:
    relevance: LOW
    correctness: VERIFIED
    review_notes: High-throughput interactome map (HuRI/CCSB); source of bare protein-binding
      IPI. Correctly cited but uninformative for HSD3B7's molecular function.
- id: PMID:32296183
  title: A reference map of the human binary protein interactome.
  findings: []
  reference_review:
    relevance: LOW
    correctness: VERIFIED
    review_notes: HuRI binary interactome map; source of numerous bare protein-binding
      IPIs. Correctly cited but uninformative for HSD3B7's molecular function.
- id: Reactome:R-HSA-192097
  title: 7alpha-hydroxycholesterol is oxidized and isomerized to 4-cholesten-7alpha-ol-3-one
  findings: []
- id: Reactome:R-HSA-193368
  title: Synthesis of bile acids and bile salts via 7alpha-hydroxycholesterol
  findings: []
- id: Reactome:R-HSA-193775
  title: Synthesis of bile acids and bile salts via 24-hydroxycholesterol
  findings: []
- id: Reactome:R-HSA-193789
  title: Cholest-5-ene-3beta,7alpha,24(S)-triol is oxidized and isomerized to 4-cholesten-7alpha,24(S)-diol-3-one
  findings: []
- id: Reactome:R-HSA-193807
  title: Synthesis of bile acids and bile salts via 27-hydroxycholesterol
  findings: []
- id: Reactome:R-HSA-193816
  title: Cholest-5-ene-3beta,7alpha,27-triol is oxidized and isomerized to 4-cholesten-7alpha,27-diol-3-one
  findings: []