ID CYAS_METAC Reviewed; 416 AA. AC Q8TKU7; DT 23-MAR-2010, integrated into UniProtKB/Swiss-Prot. DT 23-MAR-2010, sequence version 2. DT 29-MAY-2024, entry version 112. DE RecName: Full=Cysteate synthase; DE Short=CS; DE Short=Cya synthase; DE EC=2.5.1.76; GN OrderedLocusNames=MA_3297; OS Methanosarcina acetivorans (strain ATCC 35395 / DSM 2834 / JCM 12185 / OS C2A). OC Archaea; Euryarchaeota; Stenosarchaea group; Methanomicrobia; OC Methanosarcinales; Methanosarcinaceae; Methanosarcina. OX NCBI_TaxID=188937; RN [1] RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA]. RC STRAIN=ATCC 35395 / DSM 2834 / JCM 12185 / C2A; RX PubMed=11932238; DOI=10.1101/gr.223902; RA Galagan J.E., Nusbaum C., Roy A., Endrizzi M.G., Macdonald P., FitzHugh W., RA Calvo S., Engels R., Smirnov S., Atnoor D., Brown A., Allen N., Naylor J., RA Stange-Thomann N., DeArellano K., Johnson R., Linton L., McEwan P., RA McKernan K., Talamas J., Tirrell A., Ye W., Zimmer A., Barber R.D., RA Cann I., Graham D.E., Grahame D.A., Guss A.M., Hedderich R., RA Ingram-Smith C., Kuettner H.C., Krzycki J.A., Leigh J.A., Li W., Liu J., RA Mukhopadhyay B., Reeve J.N., Smith K., Springer T.A., Umayam L.A., RA White O., White R.H., de Macario E.C., Ferry J.G., Jarrell K.F., Jing H., RA Macario A.J.L., Paulsen I.T., Pritchett M., Sowers K.R., Swanson R.V., RA Zinder S.H., Lander E., Metcalf W.W., Birren B.; RT "The genome of Methanosarcina acetivorans reveals extensive metabolic and RT physiological diversity."; RL Genome Res. 12:532-542(2002). RN [2] RP FUNCTION AS A CYSTEATE SYNTHASE, CATALYTIC ACTIVITY, COFACTOR, SUBSTRATE RP SPECIFICITY, KINETIC PARAMETERS, ACTIVITY REGULATION, LACK OF FUNCTION AS A RP THREONINE SYNTHASE, SUBUNIT, AND PATHWAY. RX PubMed=19761441; DOI=10.1042/bj20090999; RA Graham D.E., Taylor S.M., Wolf R.Z., Namboori S.C.; RT "Convergent evolution of coenzyme M biosynthesis in the Methanosarcinales: RT cysteate synthase evolved from an ancestral threonine synthase."; RL Biochem. J. 424:467-478(2009). CC -!- FUNCTION: Specifically catalyzes the beta-elimination of phosphate from CC L-phosphoserine and the beta-addition of sulfite to the dehydroalanine CC intermediate to produce L-cysteate. Does not display threonine synthase CC activity like the paralog protein ThrC. {ECO:0000269|PubMed:19761441}. CC -!- CATALYTIC ACTIVITY: CC Reaction=H(+) + O-phospho-L-serine + sulfite = L-cysteate + phosphate; CC Xref=Rhea:RHEA:26486, ChEBI:CHEBI:15378, ChEBI:CHEBI:17359, CC ChEBI:CHEBI:43474, ChEBI:CHEBI:57524, ChEBI:CHEBI:58090; EC=2.5.1.76; CC Evidence={ECO:0000269|PubMed:19761441}; CC -!- COFACTOR: CC Name=pyridoxal 5'-phosphate; Xref=ChEBI:CHEBI:597326; CC Evidence={ECO:0000269|PubMed:19761441}; CC -!- ACTIVITY REGULATION: Is inhibited by AP3 (DL-2-amino-3- CC phosphonopropionate) and, to a lesser extent, by L-aspartate or AP4 CC (DL-2-amino-4-phosphonobutyrate). Is also inhibited by EDTA in vitro. CC {ECO:0000269|PubMed:19761441}. CC -!- BIOPHYSICOCHEMICAL PROPERTIES: CC Kinetic parameters: CC KM=0.43 mM for O-phospho-L-serine {ECO:0000269|PubMed:19761441}; CC KM=51 uM for sulfite {ECO:0000269|PubMed:19761441}; CC -!- PATHWAY: Cofactor biosynthesis; coenzyme M biosynthesis. CC {ECO:0000269|PubMed:19761441}. CC -!- SUBUNIT: Homotrimer. {ECO:0000269|PubMed:19761441}. CC -!- SIMILARITY: Belongs to the threonine synthase family. Cysteate synthase CC subfamily. {ECO:0000305}. CC -!- SEQUENCE CAUTION: CC Sequence=AAM06667.1; Type=Erroneous initiation; Evidence={ECO:0000305}; CC --------------------------------------------------------------------------- CC Copyrighted by the UniProt Consortium, see https://www.uniprot.org/terms CC Distributed under the Creative Commons Attribution (CC BY 4.0) License CC --------------------------------------------------------------------------- DR EMBL; AE010299; AAM06667.1; ALT_INIT; Genomic_DNA. DR RefSeq; WP_048066469.1; NC_003552.1. DR AlphaFoldDB; Q8TKU7; -. DR SMR; Q8TKU7; -. DR STRING; 188937.MA_3297; -. DR EnsemblBacteria; AAM06667; AAM06667; MA_3297. DR GeneID; 1475190; -. DR KEGG; mac:MA_3297; -. DR HOGENOM; CLU_666687_0_0_2; -. DR InParanoid; Q8TKU7; -. DR OrthoDB; 6371at2157; -. DR PhylomeDB; Q8TKU7; -. DR BioCyc; MetaCyc:MONOMER-15915; -. DR BRENDA; 2.5.1.76; 7224. DR SABIO-RK; Q8TKU7; -. DR UniPathway; UPA00355; -. DR Proteomes; UP000002487; Chromosome. DR GO; GO:0005737; C:cytoplasm; IEA:TreeGrafter. DR GO; GO:0005524; F:ATP binding; IBA:GO_Central. DR GO; GO:0044686; F:cysteate synthase activity; IEA:UniProtKB-UniRule. DR GO; GO:0008721; F:D-serine ammonia-lyase activity; IEA:TreeGrafter. DR GO; GO:0003941; F:L-serine ammonia-lyase activity; IBA:GO_Central. DR GO; GO:0000287; F:magnesium ion binding; IBA:GO_Central. DR GO; GO:0030170; F:pyridoxal phosphate binding; IBA:GO_Central. DR GO; GO:0030378; F:serine racemase activity; IBA:GO_Central. DR GO; GO:0018114; F:threonine racemase activity; IBA:GO_Central. DR GO; GO:0019295; P:coenzyme M biosynthetic process; IEA:UniProtKB-UniRule. DR GO; GO:0070179; P:D-serine biosynthetic process; IBA:GO_Central. DR Gene3D; 3.40.50.1100; -; 2. DR HAMAP; MF_02109; Cya_synthase; 1. DR InterPro; IPR022401; Cysteate_synthase. DR InterPro; IPR001926; TrpB-like_PALP. DR InterPro; IPR036052; TrpB-like_PALP_sf. DR NCBIfam; TIGR03844; cysteate_syn; 1. DR PANTHER; PTHR43050; SERINE / THREONINE RACEMASE FAMILY MEMBER; 1. DR PANTHER; PTHR43050:SF1; SERINE RACEMASE; 1. DR Pfam; PF00291; PALP; 1. DR SUPFAM; SSF53686; Tryptophan synthase beta subunit-like PLP-dependent enzymes; 1. PE 1: Evidence at protein level; KW Coenzyme M biosynthesis; Pyridoxal phosphate; Reference proteome; KW Transferase. FT CHAIN 1..416 FT /note="Cysteate synthase" FT /id="PRO_0000392650" FT BINDING 130 FT /ligand="pyridoxal 5'-phosphate" FT /ligand_id="ChEBI:CHEBI:597326" FT /evidence="ECO:0000250" FT MOD_RES 104 FT /note="N6-(pyridoxal phosphate)lysine" FT /evidence="ECO:0000250" SQ SEQUENCE 416 AA; 45536 MW; DDBB25E58C9ADA3B CRC64; MGRFILKCLK CGREYSQEYR LTCENDDSFL RAEYLEKKLE LRKQPGIGRF HSWLPVQEEL TTEAGPITYK SEALARELGL SNLYIGFSGY WPEKGAFIKT CSFKELEAHP TMQLLKESGG KAIVLASAGN TGRAFAHVSA LTGTDVYIVV PDSGIPKLWL PEEPTDSIHL ISMTPGNDYT DAINLAGRIA KLPGMVPEGG ARNVARREGM GTVMLDAAVT IGKMPDHYFQ AVGSGTGGIS AWEASLRLRE DGRFGSKLPK LQLTQNLPFV PMYNAWQEGR RDIIPEIDMK DAKKRIEETY ATVLTNRAPP YSVTGGLYDA LVDTDGIMYA VSKEEALDAK ALFESLEGID ILPPSAVAAA SLLKAVEAGN VGKDDTILLN IAGGGFKRLK EDFTLFQIEP EITVSNPDVP LEELKL //