The research report should be a detailed narrative explaining the function, biological processes, and localization of the gene product. Citations should be given for all claims.
You should prioritize authoritative reviews and primary scientific literature when conducting research. You can supplement
this with annotations you find in gene/protein databases, but these can be outdated or inaccurate.
We are specifically interested in the primary function of the gene - for enzymes, what reaction is catalyzed, and what is the substrate specificity? For transporters, what is the substrate? For structural proteins or adapters, what is the broader structural role? For signaling molecules, what is the role in the pathway.
We are interested in where in or outside the cell the gene product carries out its function.
We are also interested in the signaling or biochemical pathways in which the gene functions. We are less interested in broad pleiotropic effects, except where these elucidate the precise role.
Include evidence where possible. We are interested in both experimental evidence as well as inference from structure, evolution, or bioinformatic analysis. Precise studies should be prioritized over high-throughput, where available.
Identity verified. The specified human gene LBR encodes lamin B receptor, also called Δ14-sterol reductase LBR. This is the protein studied in the cited human-cell experiments, not the related but distinct sterol reductase TM7SF2. Its architecture matches the supplied ERG4/ERG24-family annotation: a nucleoplasm-facing amino terminus containing Tudor and arginine/serine-rich regions, followed by a multipass, approximately eight-transmembrane-segment carboxyl terminus with sterol-reductase activity. Functional complementation distinguishes its ERG24-like C14-reductase activity from ERG4-like C24-reductase activity. (nikolakaki2017laminbreceptor pages 1-3, olins2010laminbreceptor pages 8-9, tsai2016thelaminb pages 2-5)
LBR has two experimentally supported, separable primary roles: its membrane domain participates in cholesterol biosynthesis by reducing a sterol C14–C15 double bond, while its nucleoplasmic domain connects heterochromatin and the nuclear lamina to the inner nuclear membrane (INM). It is therefore best annotated as both a sterol-metabolic enzyme and a context-dependent nuclear-architecture tether, rather than solely as a lamin-binding structural protein. (tsai2016thelaminb pages 1-2, tsai2016thelaminb pages 18-20, solovei2013lbrandlamin pages 1-4)
The following evidence table separates established functions from less direct recent observations.
| Molecular function | Substrate/partner and site | Best direct evidence and quantitative result | Interpretation / limitations |
|---|---|---|---|
| Sterol C14 reduction — high confidence | NADPH-dependent reduction of the C14=C15 bond in Δ14 sterol intermediates; chiefly at the inner nuclear membrane (INM), with a context-dependent LBR pool in the contiguous ER | Human LBR complemented fungal ERG24/erg-3 C14-reductase defects but not the ERG4 C24-reductase defect. Greenberg-dysplasia fibroblasts accumulated cholesta-8,14-dien-3β-ol and carried a truncating LBR mutation (2010 review) (olins2010laminbreceptor pages 8-9). LBR also co-localized with the ER marker calnexin in fibroblasts and HeLa cells (Clayton et al., 2010) (clayton2010mutationscausinggreenberg pages 6-8). | Strong genetic, complementation and cellular evidence establishes the reaction class. However, these studies do not provide purified-LBR substrate-to-product turnover kinetics for a specific human sterol; substrate breadth and exact physiological flux remain incompletely defined. |
| Cholesterol biosynthesis — high confidence in tested human cells | Δ14 sterol intermediates and NADPH at the INM; related enzyme TM7SF2 resides mainly in the ER | CRISPR LBR-null HeLa cells had approximately 40% less total cholesterol under restrictive conditions, showed near-complete loss of newly synthesized radiolabeled cholesterol, and died or detached by days 5–7; free cholesterol or LDL rescued viability. Wild-type LBR and its isolated reductase domain rescued the defect, whereas endogenous TM7SF2 did not compensate (Tsai et al., 2016) (tsai2016thelaminb pages 5-7, tsai2016thelaminb pages 9-11, tsai2016thelaminb pages 7-9, tsai2016thelaminb pages 2-5). | Establishes LBR as the dominant functional C14 reductase under these human-cell conditions. Earlier mouse genetics suggested greater LBR–TM7SF2 redundancy, so “essential” should not be generalized to every tissue, species or nutrient condition. |
| NADPH binding and disease-variant mechanism — high confidence | NADPH-binding pocket in the membrane-embedded C-terminal sterol-reductase domain | Purified wild-type LBR bound NADPH with a reported dissociation constant of 24.2 mM; Greenberg-associated N547D and R583Q markedly weakened binding and failed to restore cholesterol synthesis. C-terminal disease truncations had 10–15-minute half-lives and underwent ubiquitin–proteasome-dependent degradation (Tsai et al., 2016) (tsai2016thelaminb pages 11-13, tsai2016thelaminb pages 13-16). | Supports defective cofactor binding and protein instability as pathogenic mechanisms, but it is not a complete catalytic-kinetics analysis. The reported millimolar affinity should be interpreted exactly as reported rather than as a turnover constant. |
| Recognition and compaction of heterochromatin — high-confidence biochemistry; context-dependent in vivo | N-terminal Tudor domain, especially W16, recognizes histone H4K20me2 on nucleoplasmic chromatin at the INM; RS and globular regions also contact histones, HP1, MeCP2 and lamin B | Peptide arrays, recombinant-H4 pull-downs and ChIP supported H4K20me2 recognition; W16A abolished selective binding. Tudor-pocket mutants diffused about sevenfold faster than wild-type LBR, and the full nucleoplasmic domain compacted reconstituted chromatin and repressed a reporter (Hirano et al., 2012) (hirano2012laminbreceptor pages 3-5, hirano2012laminbreceptor pages 5-6). | Direct binding and compaction are well supported, but Tudor binding alone does not explain all repression: the entire nucleoplasmic region is required. HP1 and methylated histones also occur away from the nuclear periphery, so binding does not prove universal locus anchoring or silencing. |
| Peripheral heterochromatin tethering and nuclear architecture — high confidence, developmentally conditional | LBR links peripheral heterochromatin to the INM; lamin A/C supplies a later or alternative tether | Loss of both LBR and lamin A/C caused peripheral heterochromatin loss and “inverted” nuclear architecture; ectopic LBR restored peripheral positioning. The study proposed sequential use of LBR early and lamin A/C later during differentiation (Solovei et al., 2013) (nikolakaki2017laminbreceptor pages 3-6, solovei2013lbrandlamin pages 1-4). | LBR is a major architectural tether, not necessarily the sole tether. Cell lineage, differentiation state, lamins and other INM proteins determine whether loss of LBR alone produces a strong phenotype. |
| Granulocyte nuclear segmentation / Pelger–Huët mechanism — moderate-to-high confidence | N-terminal Tudor/RS structural regions interacting with heterochromatin and the lamina at the INM | A mouse 236-bp N-terminal deletion predicted to remove Tudor/RS domains while retaining the transmembrane reductase region reproduced Pelger–Huët-like blood-cell nuclear defects without severe skin or skeletal dysplasia; X-inactivation effects were minor, although homozygous crosses showed approximately 35% perinatal mortality (Young et al., 2021) (young2021deletionoflbr pages 1-2, young2021deletionoflbr pages 2-3). | Supports domain-level separation of nuclear architecture from sterol metabolism, but preserved reductase activity was inferred from retention of the domain rather than established by a complete biochemical assay. Mouse findings do not fully define human genotype–phenotype relationships. |
| Allelic separation of metabolic and structural disease — high confidence | C-terminal reductase variants N547D/R583Q versus truncating alleles affecting broader LBR structure | N547D and R583Q impaired rescue of yeast C14-reductase deficiency. A heterozygous R583Q carrier had normally segmented neutrophils, whereas a carrier of a truncating allele showed Pelger morphology (Clayton et al., 2010) (clayton2010mutationscausinggreenberg pages 3-4, clayton2010mutationscausinggreenberg pages 4-6). | Demonstrates that lethal Greenberg dysplasia can arise from loss of enzymatic activity without an overt heterozygous nuclear-shape phenotype. Dosage, residual activity and protein stability nevertheless complicate simple domain-based predictions. |
| Recent sterol-pathway evidence — moderate and indirect for substrate specificity | 14-Dehydrozymostenol was monitored as a DHCR14-pathway intermediate in human Huh-7 cells | High-dose AY9944 increased 14-dehydrozymostenol, and LBR-, TM7SF2- and EBP-ablated cells were used to exclude upstream-enzyme inhibition as the principal ferroptosis-protective mechanism (Yamada et al., 2024) (yamada2024inhibitionof7dehydrocholesterol pages 4-5). | This peer-reviewed study supports pathway placement but does not directly demonstrate purified human LBR converting 14-dehydrozymostenol into a specific product. It is not definitive substrate-specificity or catalytic-kinetics evidence. |
| Recent nuclear-envelope dynamics — moderate confidence | LBR and nesprin-1 during human neutrophil extracellular-trap formation | Microscopy indicated early LBR disintegration; calcium-dependent calpain-1 degraded nesprin-1, weakening the envelope before later actin collapse (Singh et al., 2024) (singh2024calpain1weakensthe pages 1-2). | Extends LBR biology to dynamic envelope breakdown during NET release but does not redefine its primary enzymatic or chromatin-tethering functions; numerical effect sizes were unavailable in the retrieved excerpt. |
| Exploratory transcriptomic effects — preliminary | Golgi-, ribosome- and nucleolus-associated processes in LBR-depleted human HL-60/S4 myeloid cells | An 8–10-fold LBR mRNA reduction prevented retinoic-acid-induced nuclear lobulation. The analysis identified 638 knockdown-specific downregulated and 696 upregulated genes; approximately 70% of control versus 45% of knockdown nuclei contained more than two nucleoli (Welch et al., bioRxiv, 2024) (welch2024theeffectsof pages 3-6, welch2024theeffectsof pages 25-27, welch2024theeffectsof pages 20-25). | This is an unreviewed preprint using one leukemia-derived cell model. Golgi, ribosome and nucleolar associations are hypothesis-generating and should not yet be annotated as primary LBR molecular functions. |
Table: Direct and recent evidence for the enzymatic and nuclear-architectural functions of human LBR (Q14739), with quantitative findings and explicit limitations. The table distinguishes established molecular functions from indirect or preliminary 2023–2024 observations.
Reaction. LBR is annotated as a sterol Δ14-reductase (EC 1.3.1.70, as specified in the supplied UniProt record). It uses NADPH to reduce the Δ14 double bond of a 3β-hydroxysterol intermediate in the post-lanosterol cholesterol-synthesis pathway. At the reaction-class level, this can be expressed as Δ14-sterol + NADPH + H⁺ → corresponding 14,15-saturated sterol + NADP⁺. The Bloch and Kandutsch–Russell branches each include a C14-reduction step that can be supplied by LBR or TM7SF2; the pathway and their different membrane locations are depicted in Tsai and colleagues’ Figure 1. This is C14, not the C24 or terminal 7-dehydrocholesterol reduction step. (olins2010laminbreceptor pages 8-9, tsai2016thelaminb pages 2-5, tsai2016thelaminb media f8e1e067)
What is established about substrate specificity. Fibroblasts from a fetus with biallelic LBR-associated Greenberg dysplasia accumulated cholesta-8,14-dien-3β-ol, a sterol bearing the relevant Δ14 bond; human LBR also rescued fungal ERG24/erg-3 C14-reductase defects, but did not rescue an ERG4 C24-reductase defect. Together these are strong evidence for the bond and reaction class. They do not, by themselves, constitute a purified-human-LBR experiment measuring conversion of that named sterol into a named product or establish a ranked substrate-specificity series. A 2024 study monitored 14-dehydrozymostenol as a C14-reductase-pathway intermediate and observed its accumulation at higher AY9944 concentrations, but likewise did not demonstrate direct turnover by purified human LBR. Assignments of individual intermediates to LBR should therefore be distinguished from the well-established assignment of Δ14-reductase activity. (olins2010laminbreceptor pages 8-9, yamada2024inhibitionof7dehydrocholesterol pages 4-5)
Human-cell tests establish physiological importance. In CRISPR-edited HeLa cells, LBR loss nearly abolished incorporation of radiolabeled acetate into newly synthesized cholesterol under cholesterol-restrictive conditions. Total cellular cholesterol was approximately 40% lower than in controls; cells became rounded, detached and died over 5–7 days, whereas supplied free cholesterol or LDL rescued growth. Re-expression of full-length LBR or the isolated membrane sterol-reductase domain rescued the cholesterol-dependent growth defect; an amino-terminal construct lacking most of that domain did not. The result localizes the metabolic rescue activity to the reductase region, not the Tudor domain. Similar dependence on LBR was observed after its depletion in additional tested human cells. (tsai2016thelaminb pages 5-7, tsai2016thelaminb pages 9-11, tsai2016thelaminb pages 11-13)
TM7SF2 is an ER-localized, related C14 reductase, whereas LBR concentrates at the INM. Despite expression of TM7SF2 and a sterol-regulatory response, TM7SF2 did not compensate for LBR deletion in those human-cell experiments. Earlier mouse work had suggested greater functional redundancy; the defensible conclusion is that LBR is necessary for efficient cholesterol synthesis in the tested human cells under restricted cholesterol supply, not that TM7SF2 is inactive or LBR indispensable in every tissue and nutritional state. (tsai2016thelaminb pages 7-9, tsai2016thelaminb pages 16-18, tsai2016thelaminb pages 2-5)
There is a useful structure–mechanism link: disease-associated N547D and R583Q map to conserved residues corresponding to a related reductase’s NADPH-binding pocket. Purified wild-type LBR bound NADPH in a spectroscopic assay, whereas both variants had substantially weakened binding and failed to restore de novo cholesterol synthesis in LBR-null cells. The paper reports a wild-type binding Kᴅ of 24.2 mM; this is a reported binding value, not a substrate Kₘ or catalytic turnover rate. Disease-associated carboxyl-terminal truncations instead underwent rapid ubiquitin/proteasome-dependent turnover, with reported protein half-lives of approximately 10–15 minutes. These are complementary routes to loss of cellular enzyme function. (tsai2016thelaminb pages 11-13, tsai2016thelaminb pages 13-16)
LBR is an integral INM protein: its multipass reductase region resides in the membrane, whereas its amino-terminal Tudor/RS-containing region faces the nucleoplasm, where chromatin and lamins are accessible. It is not exclusively nuclear in every cell or condition. Microscopy and fractionation detected an additional ER-associated LBR pool in human fibroblasts and HeLa cells, including colocalization with calnexin. Because the INM is continuous with the ER membrane system, the available evidence establishes an INM site for LBR’s chromatin-facing activity and supports a possible ER contribution to sterol metabolism, but does not quantify precisely how much cholesterol-pathway flux occurs in each membrane. (nikolakaki2017laminbreceptor pages 1-3, tsai2016thelaminb pages 2-5, clayton2010mutationscausinggreenberg pages 6-8)
Molecular contacts. The human LBR Tudor region, approximately residues 1–62, preferentially recognizes histone H4K20me2 in peptide-binding and recombinant-histone experiments. Mutation of the Tudor-pocket residue W16 disrupted selective binding. In HeLa-cell photobleaching experiments, Tudor-region binding mutants moved around seven times faster in the nuclear envelope than wild-type LBR, supporting a role for chromatin engagement in retaining LBR at the rim. The wider nucleoplasmic domain, including RS and other interaction regions, also contacts chromatin-associated proteins such as HP1 and interacts with lamin B. Experiments with reconstituted nucleosomes and a reporter support chromatin compaction and transcriptional repression, but the whole nucleoplasmic region, rather than Tudor recognition alone, was required for the reported repression effect. (nikolakaki2017laminbreceptor pages 6-7, hirano2012laminbreceptor pages 3-5, hirano2012laminbreceptor pages 5-6)
Broader structural role. LBR helps position heterochromatin at the nuclear periphery during development and in particular cell states. In a landmark mouse comparative study, LBR-dependent tethering tended to precede lamin-A/C-dependent tethering during differentiation; loss of both tethers redistributed heterochromatin to the nuclear interior, creating an inverted nuclear arrangement. Expression of LBR could restore peripheral positioning in an appropriate model. The model explains why a single LBR perturbation does not always release all lamina-associated chromatin: tethering is cell-state-dependent and partly replaceable. Moreover, biochemical binding of H4K20me2 or HP1 alone cannot establish that every bound genomic locus is peripherally anchored or transcriptionally silent. (nikolakaki2017laminbreceptor pages 3-6, harr2016histonesandhistone pages 6-7, solovei2013lbrandlamin pages 1-4)
The nuclear-envelope role has a clear myeloid manifestation. Reduced or disrupted LBR is associated with hypolobulated granulocyte nuclei, the defining cellular feature of Pelger–Huët anomaly. In a domain-dissection mouse model, a 236-bp N-terminal Lbr deletion predicted to remove Tudor/RS regions produced Pelger–Huët-like blood-cell morphology without the severe skeletal and skin manifestations of more extensive LBR deficiency. Retention of the membrane enzyme region supports separability of functions, although retention of a domain is not, alone, a complete enzymatic activity assay. That model also showed only minor effects on X-chromosome-inactivation readouts, arguing against annotating LBR as universally essential for that process. (young2021deletionoflbr pages 1-2, young2021deletionoflbr pages 3-6)
Heterozygous disruptive LBR variants can produce Pelger–Huët granulocyte nuclear hyposegmentation; biallelic severe variants can produce Greenberg skeletal dysplasia, involving profound developmental and sterol-pathway abnormalities. However, allelic effects cannot be reduced to a simple “architecture versus metabolism” rule. In a particularly informative family, the heterozygous R583Q reductase-domain carrier had normally segmented neutrophils, whereas a carrier of a truncating allele displayed Pelger morphology. N547D and R583Q impaired rescue of sterol-reductase-deficient yeast, supporting a metabolic defect without an obligatory heterozygous nuclear-shape defect. Separately, patients’ sterol accumulation and human-cell enzyme-domain rescue support the importance of deficient C14 reduction for severe developmental disease; different variants can also change LBR abundance or stability. (olins2010laminbreceptor pages 8-9, tsai2016thelaminb pages 2-5, clayton2010mutationscausinggreenberg pages 3-4, clayton2010mutationscausinggreenberg pages 4-6)
Annotation conclusion. The most defensible molecular description of human Q14739 is an NADPH-dependent sterol C14 reductase of the cholesterol-biosynthesis pathway, embedded predominantly in the inner nuclear membrane, whose nucleoplasmic N terminus also tethers and organizes peripheral heterochromatin. Evidence strongly identifies the reaction class, cofactor, principal cellular consequences and chromatin-binding partners; direct purified-enzyme comparisons of named physiological sterol substrates, compartment-specific reaction flux and the extent of context-specific chromatin repression remain less certain. (tsai2016thelaminb pages 11-13, hirano2012laminbreceptor pages 3-5, clayton2010mutationscausinggreenberg pages 6-8, olins2010laminbreceptor pages 8-9)
References
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