PhnWX 2-aminoethylphosphonate degradation

A reusable two-reaction bacterial pathway that degrades 2-aminoethylphosphonate through phosphonoacetaldehyde. PhnW first transfers the amino group to pyruvate, producing L-alanine and phosphonoacetaldehyde. PhnX then hydrolytically cleaves the carbon-phosphorus bond, yielding acetaldehyde and inorganic phosphate. Transport of 2-aminoethylphosphonate and downstream acetaldehyde metabolism are outside the module boundary.

MODULE:2_aminoethylphosphonate_degradationCOMPLETEMetabolic Pathwaymodules/2_aminoethylphosphonate_degradation.yaml
organic phosphonate catabolic processGO:0019700
GO:0019700
organic phosphonate catabolic process
The GO process term supplies the pathway-level biological boundary.
file:PSEPK/phnW/phnW-uniprot.txt
UniProtKB entry for PSEPK PhnW
Q88KT0 supplies a reviewed PSEPK exemplar for the 2-aminoethylphosphonate:pyruvate transaminase reaction.
file:PSEPK/phnX/phnX-uniprot.txt
UniProtKB entry for PSEPK PhnX
Q88KT1 supplies a reviewed PSEPK exemplar for phosphonoacetaldehyde hydrolysis to acetaldehyde and phosphate.
file:projects/P_PUTIDA/deep-research/PSEPK__2-aminoethylphosphonate-degradation-by-phnwx__ppu00440-deep-research-openscientist.md
OpenScientist PSEPK PhnWX pathway satisfiability research
Provider-generated species/pathway research supports the narrow two-step module boundary, confirms that both reactions are covered in KT2440, and distinguishes the uncertain uptake and regulatory context from the core pathway.
PMID:37836707
The Microbial Degradation of Natural and Anthropogenic Phosphonates.
The PhnWX route is distinct from PhnWAY and occurs beyond Pseudomonas; the review surveys bacterial pathway distribution and lineage-dependent regulation.
The PhnWX pathway was initially described in Bacillus cereus
PMID:12107130
The 2-aminoethylphosphonate-specific transaminase of the 2-aminoethylphosphonate degradation pathway.
Purified Salmonella PhnW catalyzes AEP/pyruvate transamination to phosphonoacetaldehyde and L-alanine. This supplies direct evidence for the first step, separately from inference for KT2440.
catalyzes the reversible reaction of AEP and pyruvate to form phosphonoacetaldehyde (P-Ald) and L-alanine (L-Ala).
PMID:9649311
Insights into the mechanism of catalysis by the P-C bond-cleaving enzyme phosphonoacetaldehyde hydrolase derived from gene sequence analysis and mutagenesis.
Recombinant Salmonella and Bacillus phosphonatases establish hydrolytic C-P cleavage and a shared catalytic mechanism across the two bacterial lineages.
Phosphonoacetaldehyde hydrolase (phosphonatase) catalyzes the hydrolysis of phosphonoacetaldehyde to acetaldehyde and inorganic phosphate. In this study, the genes encoding phosphonatase in Bacillus cereus and in Salmonella typhimurium were cloned for high- level expression in Escherichia coli. The kinetic properties of the purified, recombinant phosphonatases were determined. The Schiff base mechanism known to operate in the B. cereus enzyme was verified for the S. typhimurium enzyme by phosphonoacetaldehyde-sodium borohydride- induced inactivation and by site-directed mutagenesis of the catalytic lysine 53.
PMID:37876809
Deciphering the role of recurrent FAD-dependent enzymes in bacterial phosphonate catabolism.
Some bacterial pathways generate phosphonoacetaldehyde through a FAD-dependent oxidoreductase instead of PhnW. Thus a PhnX homolog alone does not establish this PhnWX module.
they surrogate the role of PhnW in organisms that do not possess the transaminase

The bacterial taxonomic envelope covers the sampled Bacillota (Bacillus cereus) and Pseudomonadota (Salmonella typhimurium and Pseudomonas putida), without asserting universal pathway retention. Each step has a narrow verified PANTHER subfamily and representatives from both phyla. Salmonella PhnW and Salmonella/Bacillus PhnX provide direct biochemical anchors; the KT2440 proteins and Bacillus PhnW remain distinguished as homology-supported exemplars. Q8RLU1 is a probable fragment with a sequence caution, not an experimentally established intact Bacillus PhnW. Neither phosphate-starvation regulation nor a particular transporter is a defining component: regulatory wiring differs among studied strains. PhnWAY, oxidative AEP deamination and broad-substrate C-P lyase routes remain outside this two-reaction PhnWX boundary. PbfD-mediated PAA formation explains why phnX presence alone is insufficient to infer PhnWX. The KT2440-specific experimental and regulatory gaps below remain open.

3Nodes
2Parts
0Variant Sets
0Variants
2Annotons
1Connections

Derived QC

Recommended-field compliance

100.0% recommended fields populated

All recommended fields populated.

Module deep research

✗ none found

No MODULE:2_aminoethylphosphonate_degradation deep-research report alongside the module YAML.

Leaf nodes lacking representative members

✓ every leaf node grounds to a representative protein.

Template conformance

✓ every declared conforms_to bundle matches its template motif.

Function consistency and core coverage

6 gene-function check(s) reflected in core functions · 0 conflict(s) · 0 evidence or coverage gap(s) (8 comparison(s))

Retained noncore functions are reported separately; they do not require promotion to core functions. Support from representative genes does not establish conservation across the whole family. Missing reviews or identifiers leave a claim unverified.

AnnotonParticipantFunctionAssessment
phnw_activity phnW (PSEPK)
UniProtKB:Q88KT0
Family Representative 		2-aminoethylphosphonate:pyruvate transaminase activity
GO:0047304 		Core Supported
The GO molecular function is reflected in core_functions (exact term or a reviewed subclass).
phnw_activity phnW (SALTY)
UniProtKB:P96060
Family Representative 		2-aminoethylphosphonate:pyruvate transaminase activity
GO:0047304 		Core Supported
The GO molecular function is reflected in core_functions (exact term or a reviewed subclass).
phnw_activity phnW (BACCE)
UniProtKB:Q8RLU1
Family Representative 		2-aminoethylphosphonate:pyruvate transaminase activity
GO:0047304 		Core Supported
The GO molecular function is reflected in core_functions (exact term or a reviewed subclass).
phnx_activity phnX (PSEPK)
UniProtKB:Q88KT1
Family Representative 		phosphonoacetaldehyde hydrolase activity
GO:0050194 		Core Supported
The GO molecular function is reflected in core_functions (exact term or a reviewed subclass).
phnx_activity phnX (SALTY)
UniProtKB:Q7ZAP3
Family Representative 		phosphonoacetaldehyde hydrolase activity
GO:0050194 		Core Supported
The GO molecular function is reflected in core_functions (exact term or a reviewed subclass).
phnx_activity phnX (BACCE)
UniProtKB:O31156
Family Representative 		phosphonoacetaldehyde hydrolase activity
GO:0050194 		Core Supported
The GO molecular function is reflected in core_functions (exact term or a reviewed subclass).
phnw_activity PhnW 2-aminoethylphosphonate transaminase subfamily
PANTHER:PTHR42778:SF1
Family 		2-aminoethylphosphonate:pyruvate transaminase activity
GO:0047304 		Family Supported
Family review supports GO:0047304 FAMILY_WIDE. Established biochemically for the reference member (purified recombinant Salmonella PhnW) and assigned to the other members by the PhnW-specific HAMAP rule. The family is a single subfamily with no evidence of a diverged branch, so the activity is safe to transfer to intact members. It should not be transferred to truncated sequences without checking that the PLP lysine and the dimer interface are present.
phnx_activity PhnX phosphonoacetaldehyde hydrolase subfamily
PANTHER:PTHR43434:SF19
Family 		phosphonoacetaldehyde hydrolase activity
GO:0050194 		Family Supported
Family review supports GO:0050194 for PANTHER:PTHR43434:SF19. The C-P bond hydrolase reaction, with its cap-domain Schiff-base lysine, is specific to the PhnX subfamily.

Gene-review completeness (6/6 grounded genes reviewed)

6 complete review(s) · 2 with deep research · 0 missing review · 4 reviewed but lacking deep research

Gene Review Complete Deep research
phnW P96060 ✓ ✓ ✗
phnW Q88KT0 ✓ ✓ ✓
phnW Q8RLU1 ✓ ✓ ✗
phnX O31156 ✓ ✓ ✗
phnX Q7ZAP3 ✓ ✓ ✗
phnX Q88KT1 ✓ ✓ ✓

Details

Context
Bacteria with a PhnWX degradation routeNCBITaxon:2
PMID:37836707
The Microbial Degradation of Natural and Anthropogenic Phosphonates.
The PhnWX route is distinct from PhnWAY and occurs beyond Pseudomonas; the review surveys bacterial pathway distribution and lineage-dependent regulation.
The PhnWX pathway was initially described in Bacillus cereus
PMID:9649311
Insights into the mechanism of catalysis by the P-C bond-cleaving enzyme phosphonoacetaldehyde hydrolase derived from gene sequence analysis and mutagenesis.
Cloning and recombinant characterization in Bacillus and Salmonella provide biochemical anchors from two bacterial lineages.
the genes encoding phosphonatase in Bacillus cereus and in Salmonella typhimurium were cloned

Bacteria is the narrowest shared taxonomic scope of the Bacillota and Pseudomonadota exemplars. Homolog presence alone does not establish a full PhnWX route; both reaction roles must be supported. This is not an inferred ancestral-state or universal bacterial-presence claim.

PhnWX 2-aminoethylphosphonate degradationMetabolic Pathway2_aminoethylphosphonate_degradation
organic phosphonate catabolic processGO:0019700
Context
Bacteria with a PhnWX degradation routeNCBITaxon:2
PMID:37836707
The Microbial Degradation of Natural and Anthropogenic Phosphonates.
The PhnWX route is distinct from PhnWAY and occurs beyond Pseudomonas; the review surveys bacterial pathway distribution and lineage-dependent regulation.
The PhnWX pathway was initially described in Bacillus cereus
PMID:9649311
Insights into the mechanism of catalysis by the P-C bond-cleaving enzyme phosphonoacetaldehyde hydrolase derived from gene sequence analysis and mutagenesis.
Cloning and recombinant characterization in Bacillus and Salmonella provide biochemical anchors from two bacterial lineages.
the genes encoding phosphonatase in Bacillus cereus and in Salmonella typhimurium were cloned

Bacteria is the narrowest shared taxonomic scope of the Bacillota and Pseudomonadota exemplars. Homolog presence alone does not establish a full PhnWX route; both reaction roles must be supported. This is not an inferred ancestral-state or universal bacterial-presence claim.

Connections

PhnW-generated phosphonoacetaldehyde is the direct substrate of PhnX.
PMID:37836707
The Microbial Degradation of Natural and Anthropogenic Phosphonates.
Section 3.1 identifies phosphonoacetaldehyde as the product passed from PhnW to PhnX; PhnWAY shares the first reaction but replaces the second.
subsequent to the PhnW reaction
PMID:12107130
The 2-aminoethylphosphonate-specific transaminase of the 2-aminoethylphosphonate degradation pathway.
Purified Salmonella PhnW catalyzes AEP/pyruvate transamination to phosphonoacetaldehyde and L-alanine. This supplies direct evidence for the first step, separately from inference for KT2440.
catalyzes the reversible reaction of AEP and pyruvate to form phosphonoacetaldehyde (P-Ald) and L-alanine (L-Ala).
PMID:9649311
Insights into the mechanism of catalysis by the P-C bond-cleaving enzyme phosphonoacetaldehyde hydrolase derived from gene sequence analysis and mutagenesis.
Recombinant Salmonella and Bacillus phosphonatases establish hydrolytic C-P cleavage and a shared catalytic mechanism across the two bacterial lineages.
Phosphonoacetaldehyde hydrolase (phosphonatase) catalyzes the hydrolysis of phosphonoacetaldehyde to acetaldehyde and inorganic phosphate. In this study, the genes encoding phosphonatase in Bacillus cereus and in Salmonella typhimurium were cloned for high-level expression in Escherichia coli. The kinetic properties of the purified, recombinant phosphonatases were determined. The Schiff base mechanism known to operate in the B. cereus enzyme was verified for the S. typhimurium enzyme by phosphonoacetaldehyde-sodium borohydride-induced inactivation and by site-directed mutagenesis of the catalytic lysine 53.
Part 1: phosphonoacetaldehyde formation
2-aminoethylphosphonate transaminationReactionaep_transamination

Annotons

PhnW 2-aminoethylphosphonate:pyruvate transaminase
phnw_activity
Participant: Family: PhnW 2-aminoethylphosphonate transaminase subfamily
Family:
PhnW 2-aminoethylphosphonate transaminase subfamilyPANTHER:PTHR42778:SF1
Representative Members: phnW (PSEPK)UniProtKB:Q88KT0 phnW (SALTY)UniProtKB:P96060 phnW (BACCE)UniProtKB:Q8RLU1
Required Function:
2-aminoethylphosphonate:pyruvate transaminase activityGO:0047304

Function

2-aminoethylphosphonate:pyruvate transaminase activityGO:0047304
Substrates: 2-aminoethylphosphonate pyruvate
Products: phosphonoacetaldehyde L-alanine

Processes

organic phosphonate catabolic processGO:0019700

Produces the phosphonoacetaldehyde substrate required by PhnX.

PMID:12107130
The 2-aminoethylphosphonate-specific transaminase of the 2-aminoethylphosphonate degradation pathway.
Purified Salmonella PhnW catalyzes AEP/pyruvate transamination to phosphonoacetaldehyde and L-alanine. This supplies direct evidence for the first step, separately from inference for KT2440.
catalyzes the reversible reaction of AEP and pyruvate to form phosphonoacetaldehyde (P-Ald) and L-alanine (L-Ala).
PMID:37836707
The Microbial Degradation of Natural and Anthropogenic Phosphonates.
Section 3.1 places this activity in the ordered PhnWX route and distinguishes the alternative PhnWAY route.
Part 2: carbon-phosphorus bond cleavage
Phosphonoacetaldehyde hydrolysisReactionphosphonoacetaldehyde_hydrolysis

Annotons

PhnX phosphonoacetaldehyde hydrolase
phnx_activity
Participant: Family: PhnX phosphonoacetaldehyde hydrolase subfamily
Family:
PhnX phosphonoacetaldehyde hydrolase subfamilyPANTHER:PTHR43434:SF19
Representative Members: phnX (PSEPK)UniProtKB:Q88KT1 phnX (SALTY)UniProtKB:Q7ZAP3 phnX (BACCE)UniProtKB:O31156
Required Function:
phosphonoacetaldehyde hydrolase activityGO:0050194

Function

phosphonoacetaldehyde hydrolase activityGO:0050194
Substrates: phosphonoacetaldehyde water
Products: acetaldehyde phosphate

Processes

organic phosphonate catabolic processGO:0019700

Releases inorganic phosphate and acetaldehyde from phosphonoacetaldehyde.

PMID:9649311
Insights into the mechanism of catalysis by the P-C bond-cleaving enzyme phosphonoacetaldehyde hydrolase derived from gene sequence analysis and mutagenesis.
Recombinant Salmonella and Bacillus phosphonatases establish hydrolytic C-P cleavage and a shared catalytic mechanism across the two bacterial lineages.
Phosphonoacetaldehyde hydrolase (phosphonatase) catalyzes the hydrolysis of phosphonoacetaldehyde to acetaldehyde and inorganic phosphate. In this study, the genes encoding phosphonatase in Bacillus cereus and in Salmonella typhimurium were cloned for high-level expression in Escherichia coli. The kinetic properties of the purified, recombinant phosphonatases were determined. The Schiff base mechanism known to operate in the B. cereus enzyme was verified for the S. typhimurium enzyme by phosphonoacetaldehyde-sodium borohydride-induced inactivation and by site-directed mutagenesis of the catalytic lysine 53.
PMID:37836707
The Microbial Degradation of Natural and Anthropogenic Phosphonates.
Section 3.1 places this activity in the ordered PhnWX route and distinguishes the alternative PhnWAY route.