ID   A0A249KSC4_9ACTN        Unreviewed;       308 AA.
AC   A0A249KSC4;
DT   20-DEC-2017, integrated into UniProtKB/TrEMBL.
DT   20-DEC-2017, sequence version 1.
DT   27-MAR-2024, entry version 27.
DE   RecName: Full=Cysteine synthase {ECO:0000256|ARBA:ARBA00012681, ECO:0000256|RuleBase:RU003985};
DE            EC=2.5.1.47 {ECO:0000256|ARBA:ARBA00012681, ECO:0000256|RuleBase:RU003985};
GN   ORFNames=A7sIIA15_02040 {ECO:0000313|EMBL:ASY19676.1};
OS   Candidatus Planktophila vernalis.
OC   Bacteria; Actinomycetota; Actinomycetes; Candidatus Nanopelagicales;
OC   Candidatus Nanopelagicaceae; Planktophila.
OX   NCBI_TaxID=1884907 {ECO:0000313|EMBL:ASY19676.1, ECO:0000313|Proteomes:UP000217186};
RN   [1] {ECO:0000313|EMBL:ASY19676.1, ECO:0000313|Proteomes:UP000217186}
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=MMS-IIA-15 {ECO:0000313|EMBL:ASY19676.1};
RA   Neuenschwander S.M., Salcher M., Ghai R., Pernthaler J.;
RT   "High microdiversification within the ubiquitous acI lineage of
RT   Actinobacteria.";
RL   Submitted (JUL-2016) to the EMBL/GenBank/DDBJ databases.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=hydrogen sulfide + O-acetyl-L-serine = acetate + L-cysteine;
CC         Xref=Rhea:RHEA:14829, ChEBI:CHEBI:29919, ChEBI:CHEBI:30089,
CC         ChEBI:CHEBI:35235, ChEBI:CHEBI:58340; EC=2.5.1.47;
CC         Evidence={ECO:0000256|ARBA:ARBA00000298,
CC         ECO:0000256|RuleBase:RU003985};
CC   -!- COFACTOR:
CC       Name=pyridoxal 5'-phosphate; Xref=ChEBI:CHEBI:597326;
CC         Evidence={ECO:0000256|ARBA:ARBA00001933,
CC         ECO:0000256|PIRSR:PIRSR605856-50, ECO:0000256|RuleBase:RU003985};
CC   -!- SIMILARITY: Belongs to the cysteine synthase/cystathionine beta-
CC       synthase family. {ECO:0000256|ARBA:ARBA00007103,
CC       ECO:0000256|RuleBase:RU003985}.
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DR   EMBL; CP016776; ASY19676.1; -; Genomic_DNA.
DR   AlphaFoldDB; A0A249KSC4; -.
DR   KEGG; pvn:A7sIIA15_02040; -.
DR   OrthoDB; 5176350at2; -.
DR   Proteomes; UP000217186; Chromosome.
DR   GO; GO:0004124; F:cysteine synthase activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0006535; P:cysteine biosynthetic process from serine; IEA:UniProtKB-UniRule.
DR   CDD; cd01561; CBS_like; 1.
DR   Gene3D; 3.40.50.1100; -; 2.
DR   InterPro; IPR005856; Cys_synth.
DR   InterPro; IPR005859; CysK.
DR   InterPro; IPR001216; P-phosphate_BS.
DR   InterPro; IPR001926; TrpB-like_PALP.
DR   InterPro; IPR036052; TrpB-like_PALP_sf.
DR   NCBIfam; TIGR01139; cysK; 1.
DR   NCBIfam; TIGR01136; cysKM; 1.
DR   PANTHER; PTHR10314; CYSTATHIONINE BETA-SYNTHASE; 1.
DR   PANTHER; PTHR10314:SF253; CYSTEINE SYNTHASE 1; 1.
DR   Pfam; PF00291; PALP; 1.
DR   SUPFAM; SSF53686; Tryptophan synthase beta subunit-like PLP-dependent enzymes; 1.
DR   PROSITE; PS00901; CYS_SYNTHASE; 1.
PE   3: Inferred from homology;
KW   Amino-acid biosynthesis {ECO:0000256|RuleBase:RU003985};
KW   Cysteine biosynthesis {ECO:0000256|ARBA:ARBA00023192,
KW   ECO:0000256|RuleBase:RU003985};
KW   Pyridoxal phosphate {ECO:0000256|ARBA:ARBA00022898,
KW   ECO:0000256|PIRSR:PIRSR605856-50};
KW   Reference proteome {ECO:0000313|Proteomes:UP000217186};
KW   Transferase {ECO:0000256|ARBA:ARBA00022679, ECO:0000256|RuleBase:RU003985}.
FT   DOMAIN          8..290
FT                   /note="Tryptophan synthase beta chain-like PALP"
FT                   /evidence="ECO:0000259|Pfam:PF00291"
FT   BINDING         74
FT                   /ligand="pyridoxal 5'-phosphate"
FT                   /ligand_id="ChEBI:CHEBI:597326"
FT                   /evidence="ECO:0000256|PIRSR:PIRSR605856-50"
FT   BINDING         176..180
FT                   /ligand="pyridoxal 5'-phosphate"
FT                   /ligand_id="ChEBI:CHEBI:597326"
FT                   /evidence="ECO:0000256|PIRSR:PIRSR605856-50"
FT   BINDING         264
FT                   /ligand="pyridoxal 5'-phosphate"
FT                   /ligand_id="ChEBI:CHEBI:597326"
FT                   /evidence="ECO:0000256|PIRSR:PIRSR605856-50"
FT   MOD_RES         44
FT                   /note="N6-(pyridoxal phosphate)lysine"
FT                   /evidence="ECO:0000256|PIRSR:PIRSR605856-51"
SQ   SEQUENCE   308 AA;  32311 MW;  8A890F97D0EC14DA CRC64;
     MKLYNSITEI FGNTPLLRIN KITDGAAGNV YAKLEFYNPT SSVKDRLGVA MIDAAEASGE
     LKPGGTIVEA TSGNTGIAVA MVAAARGYKA IMTMPESVSK ERRKLIRAYG AELVLTPAAE
     GMKGAVAAAE KLAESGAVLV RQFENQAGPE IHYKTTGAEI WRDLDGKVDA FVSGIGTGGT
     ITGTGRYLKE KNPAIKVFGV EPAASPILNG GEPGPHPIQG IGANFIPNVL DRTVYDEVLD
     ATAADAIKYA RRAGAEEGFL AGISSGATLW AASEIAKRPE FAGKNIVVIC ASNGERYLST
     VLYEDLVD
//