ArgE (PP_5186) is a predicted M20A-family acetylornithine deacetylase (EC 3.5.1.16) that hydrolyzes N-acetyl-L-ornithine to L-ornithine and acetate in the linear acetylated-ornithine route to L-arginine. Direct KT2440 enzymology is unavailable, and its condition-specific contribution relative to the cyclic ArgJ route is unresolved.
| GO Term | Evidence | Action | Reason |
|---|---|---|---|
| GO:0005737 cytoplasm | IEA GO_REF:0000044 | ACCEPT | Summary: The cytoplasm is the inferred compartment of this soluble biosynthetic enzyme. Reason: This location is part of the core metabolic role. It is supported by conserved soluble-enzyme biology and ArgE-specific family assignment; the ARBA location line alone is not treated as evidence. Supporting Evidence: file:PSEPK/argE/argE-uniprot.txt DR NCBIfam; TIGR01892; AcOrn-deacetyl; 1. |
| GO:0006526 L-arginine biosynthetic process | IEA GO_REF:0000120 | ACCEPT | Summary: The enzyme contributes catalytic chemistry to L-arginine biosynthesis. Reason: The enzyme catalyzes a chemical step of the acetylated-ornithine route to arginine, supported by curated reaction and family classification. The native insertion mutant remains prototrophic (PMID31451546), compatible with metabolic redundancy; this does not demonstrate inactivity or identify its compensator. Supporting Evidence: file:PSEPK/argE/argE-uniprot.txt DR NCBIfam; TIGR01892; AcOrn-deacetyl; 1. PMID:31451546 It should be noted that these three mutants do not display arginine auxotrophy |
| GO:0008777 acetylornithine deacetylase activity | IEA GO_REF:0000120 | ACCEPT | Summary: This is the substrate-specific molecular function predicted for ArgE. Reason: EC 3.5.1.16, HAMAP MF_01108, NCBIfam TIGR01892, and the ArgE M20A subfamily agree. This assignment uses curated catalytic/family evidence; it is not a direct purified-enzyme measurement in KT2440. Supporting Evidence: file:PSEPK/argE/argE-uniprot.txt DR NCBIfam; TIGR01892; AcOrn-deacetyl; 1. |
| GO:0016787 hydrolase activity | IEA GO_REF:0000120 | MODIFY | Summary: Refine the true broad annotation to the supported substrate-specific function. Reason: The broad term is biologically compatible with the enzyme; the supported specific activity/process already present in this review is more informative. Breadth alone does not make a claim over-annotated. Proposed replacements: acetylornithine deacetylase activity Supporting Evidence: file:PSEPK/argE/argE-uniprot.txt DR NCBIfam; TIGR01892; AcOrn-deacetyl; 1. |
| GO:0019213 deacetylase activity | IEA GO_REF:0000002 | MODIFY | Summary: Refine the true broad annotation to the supported substrate-specific function. Reason: The broad term is biologically compatible with the enzyme; the supported specific activity/process already present in this review is more informative. Breadth alone does not make a claim over-annotated. Proposed replacements: acetylornithine deacetylase activity Supporting Evidence: file:PSEPK/argE/argE-uniprot.txt DR NCBIfam; TIGR01892; AcOrn-deacetyl; 1. |
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Download this section (compressed HTML)Q: Under which growth conditions does ArgE-mediated hydrolysis contribute measurably relative to ArgJ-mediated acetyl recycling in KT2440?
Suggested experts: microbial arginine metabolism
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