Reaction participants Show >> << Hide
- Name help_outline hypotaurine Identifier CHEBI:57853 Charge 0 Formula C2H7NO2S InChIKeyhelp_outline VVIUBCNYACGLLV-UHFFFAOYSA-N SMILEShelp_outline [NH3+]CCS([O-])=O 2D coordinates Mol file for the small molecule Search links Involved in 6 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline pyruvate Identifier CHEBI:15361 (Beilstein: 3587721; CAS: 57-60-3) help_outline Charge -1 Formula C3H3O3 InChIKeyhelp_outline LCTONWCANYUPML-UHFFFAOYSA-M SMILEShelp_outline CC(=O)C([O-])=O 2D coordinates Mol file for the small molecule Search links Involved in 215 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline 2-sulfinoacetaldehyde Identifier CHEBI:142501 Charge -1 Formula C2H3O3S InChIKeyhelp_outline GPIFJZBDHMKDSK-UHFFFAOYSA-M SMILEShelp_outline [H]C(CS([O-])=O)=O 2D coordinates Mol file for the small molecule Search links Involved in 2 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline L-alanine Identifier CHEBI:57972 Charge 0 Formula C3H7NO2 InChIKeyhelp_outline QNAYBMKLOCPYGJ-REOHCLBHSA-N SMILEShelp_outline C[C@H]([NH3+])C([O-])=O 2D coordinates Mol file for the small molecule Search links Involved in 112 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
Cross-references
RHEA:58056 | RHEA:58057 | RHEA:58058 | RHEA:58059 | |
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Reaction direction help_outline | undefined | left-to-right | right-to-left | bidirectional |
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Publications
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Paracoccus denitrificans PD1222 utilizes hypotaurine via transamination followed by spontaneous desulfination to yield acetaldehyde and, finally, acetate for growth.
Felux A.K., Denger K., Weiss M., Cook A.M., Schleheck D.
Hypotaurine (HT; 2-aminoethane-sulfinate) is known to be utilized by bacteria as a sole source of carbon, nitrogen, and energy for growth, as is taurine (2-aminoethane-sulfonate); however, the corresponding HT degradation pathway has remained undefined. Genome-sequenced Paracoccus denitrificans PD ... >> More
Hypotaurine (HT; 2-aminoethane-sulfinate) is known to be utilized by bacteria as a sole source of carbon, nitrogen, and energy for growth, as is taurine (2-aminoethane-sulfonate); however, the corresponding HT degradation pathway has remained undefined. Genome-sequenced Paracoccus denitrificans PD1222 utilized HT (and taurine) quantitatively for heterotrophic growth and released the HT sulfur as sulfite (and sulfate) and HT nitrogen as ammonium. Enzyme assays with cell extracts suggested that an HT-inducible HT:pyruvate aminotransferase (Hpa) catalyzes the deamination of HT in an initial reaction step. Partial purification of the Hpa activity and peptide fingerprinting-mass spectrometry (PF-MS) identified the Hpa candidate gene; it encoded an archetypal taurine:pyruvate aminotransferase (Tpa). The same gene product was identified via differential PAGE and PF-MS, as was the gene of a strongly HT-inducible aldehyde dehydrogenase (Adh). Both genes were overexpressed in Escherichia coli. The overexpressed, purified Hpa/Tpa showed HT:pyruvate-aminotransferase activity. Alanine, acetaldehyde, and sulfite were identified as the reaction products but not sulfinoacetaldehyde; the reaction of Hpa/Tpa with taurine yielded sulfoacetaldehyde, which is stable. The overexpressed, purified Adh oxidized the acetaldehyde generated during the Hpa reaction to acetate in an NAD(+)-dependent reaction. Based on these results, the following degradation pathway for HT in strain PD1222 can be depicted. The identified aminotransferase converts HT to sulfinoacetaldehyde, which desulfinates spontaneously to acetaldehyde and sulfite; the inducible aldehyde dehydrogenase oxidizes acetaldehyde to yield acetate, which is metabolized, and sulfite, which is excreted. << Less
J. Bacteriol. 195:2921-2930(2013) [PubMed] [EuropePMC]
This publication is cited by 1 other entry.