ID   NIFS_RHOCA              Reviewed;         384 AA.
AC   Q07177;
DT   01-OCT-1994, integrated into UniProtKB/Swiss-Prot.
DT   01-OCT-1994, sequence version 1.
DT   03-AUG-2022, entry version 82.
DE   RecName: Full=Cysteine desulfurase {ECO:0000250|UniProtKB:P05341};
DE            EC=2.8.1.7 {ECO:0000250|UniProtKB:P05341};
DE   AltName: Full=Nitrogenase metalloclusters biosynthesis protein NifS {ECO:0000250|UniProtKB:P05341};
GN   Name=nifS {ECO:0000250|UniProtKB:P05341};
OS   Rhodobacter capsulatus (Rhodopseudomonas capsulata).
OC   Bacteria; Proteobacteria; Alphaproteobacteria; Rhodobacterales;
OC   Rhodobacteraceae; Rhodobacter.
OX   NCBI_TaxID=1061;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RC   STRAIN=ATCC 33303 / B10;
RX   PubMed=8492805; DOI=10.1007/bf00291996;
RA   Masepohl B., Angermueller S., Hennecke S., Huebner P., Moreno-Vivian C.,
RA   Klipp W.;
RT   "Nucleotide sequence and genetic analysis of the Rhodobacter capsulatus
RT   ORF6-nifUI SVW gene region: possible role of NifW in homocitrate
RT   processing.";
RL   Mol. Gen. Genet. 238:369-382(1993).
CC   -!- FUNCTION: Catalyzes the removal of elemental sulfur atoms from cysteine
CC       to produce alanine. Seems to participate in the biosynthesis of the
CC       nitrogenase metalloclusters by providing the inorganic sulfur required
CC       for the Fe-S core formation. {ECO:0000250|UniProtKB:P05341}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=[sulfur carrier]-H + L-cysteine = [sulfur carrier]-SH + L-
CC         alanine; Xref=Rhea:RHEA:43892, Rhea:RHEA-COMP:14737, Rhea:RHEA-
CC         COMP:14739, ChEBI:CHEBI:29917, ChEBI:CHEBI:35235, ChEBI:CHEBI:57972,
CC         ChEBI:CHEBI:64428; EC=2.8.1.7;
CC         Evidence={ECO:0000250|UniProtKB:P05341};
CC   -!- COFACTOR:
CC       Name=pyridoxal 5'-phosphate; Xref=ChEBI:CHEBI:597326;
CC         Evidence={ECO:0000250|UniProtKB:P05341};
CC   -!- SUBUNIT: Homodimer. {ECO:0000250|UniProtKB:P05341}.
CC   -!- SIMILARITY: Belongs to the class-V pyridoxal-phosphate-dependent
CC       aminotransferase family. NifS/IscS subfamily. {ECO:0000305}.
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DR   EMBL; X68444; CAA48487.1; -; Genomic_DNA.
DR   PIR; S34816; S34816.
DR   AlphaFoldDB; Q07177; -.
DR   SMR; Q07177; -.
DR   GO; GO:0031071; F:cysteine desulfurase activity; IEA:UniProtKB-EC.
DR   GO; GO:0051536; F:iron-sulfur cluster binding; IEA:UniProtKB-KW.
DR   GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-KW.
DR   GO; GO:0009399; P:nitrogen fixation; IEA:UniProtKB-KW.
DR   Gene3D; 3.40.640.10; -; 1.
DR   Gene3D; 3.90.1150.10; -; 1.
DR   InterPro; IPR000192; Aminotrans_V_dom.
DR   InterPro; IPR020578; Aminotrans_V_PyrdxlP_BS.
DR   InterPro; IPR016454; Cysteine_dSase.
DR   InterPro; IPR015424; PyrdxlP-dep_Trfase.
DR   InterPro; IPR015421; PyrdxlP-dep_Trfase_major.
DR   InterPro; IPR015422; PyrdxlP-dep_Trfase_small.
DR   Pfam; PF00266; Aminotran_5; 1.
DR   PIRSF; PIRSF005572; NifS; 1.
DR   SUPFAM; SSF53383; SSF53383; 1.
DR   PROSITE; PS00595; AA_TRANSFER_CLASS_5; 1.
PE   3: Inferred from homology;
KW   Iron; Iron-sulfur; Metal-binding; Nitrogen fixation; Pyridoxal phosphate;
KW   Transferase.
FT   CHAIN           1..384
FT                   /note="Cysteine desulfurase"
FT                   /id="PRO_0000150258"
FT   ACT_SITE        325
FT                   /note="Cysteine persulfide intermediate"
FT                   /evidence="ECO:0000250|UniProtKB:P05341"
FT   BINDING         74..75
FT                   /ligand="pyridoxal 5'-phosphate"
FT                   /ligand_id="ChEBI:CHEBI:597326"
FT                   /evidence="ECO:0000250|UniProtKB:P0A6B9"
FT   BINDING         154
FT                   /ligand="pyridoxal 5'-phosphate"
FT                   /ligand_id="ChEBI:CHEBI:597326"
FT                   /evidence="ECO:0000250|UniProtKB:O29689"
FT   BINDING         180
FT                   /ligand="pyridoxal 5'-phosphate"
FT                   /ligand_id="ChEBI:CHEBI:597326"
FT                   /evidence="ECO:0000250|UniProtKB:P0A6B9"
FT   BINDING         200..202
FT                   /ligand="pyridoxal 5'-phosphate"
FT                   /ligand_id="ChEBI:CHEBI:597326"
FT                   /evidence="ECO:0000250|UniProtKB:P0A6B9"
FT   BINDING         238
FT                   /ligand="pyridoxal 5'-phosphate"
FT                   /ligand_id="ChEBI:CHEBI:597326"
FT                   /evidence="ECO:0000250|UniProtKB:P0A6B9"
FT   BINDING         325
FT                   /ligand="[2Fe-2S] cluster"
FT                   /ligand_id="ChEBI:CHEBI:190135"
FT                   /note="via persulfide group"
FT                   /evidence="ECO:0000250|UniProtKB:O29689"
FT   MOD_RES         203
FT                   /note="N6-(pyridoxal phosphate)lysine"
FT                   /evidence="ECO:0000250|UniProtKB:P0A6B9"
SQ   SEQUENCE   384 AA;  40282 MW;  C2C4A282D80A8391 CRC64;
     MTQPAIYLDN NATTRVFPEV VAAMLPYFTE HFGNASSGHG FGAQAGLGLR KARLAVAALI
     GAASEQEILF TSGGTEANTT AIRSALAVQD GRREIIISAV EHPAILMLAA DLEKTEGVRV
     HRIPVDHLGR LDLAAYRAAL SDRVAVASIM WANNRYDLPV PQLAAEAHAA GALFHTDAVQ
     AVGKLPMSLA DTEIDMLSLS GHKFHGPKGV GALYLRKGVA FRPLLRGGKQ ERGRRAGTEN
     VPALVGMGLA AEIVAARMAA DLSRIATLRD WLESGILALG GCQRLGDPAN RLANTCTLAF
     DRIDSEAVLT KLARAGIAIS TGSACASGAM EPSHVTRAMA VPFTAAHGVV RFSLSADTTA
     AELSRVLAIL PEILAELRPV PVTA