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ISCS_BUCAP
ID   ISCS_BUCAP              Reviewed;         404 AA.
AC   O51886;
DT   30-MAY-2000, integrated into UniProtKB/Swiss-Prot.
DT   01-JUN-1998, sequence version 1.
DT   03-AUG-2022, entry version 130.
DE   RecName: Full=Cysteine desulfurase IscS {ECO:0000255|HAMAP-Rule:MF_00331};
DE            EC=2.8.1.7 {ECO:0000255|HAMAP-Rule:MF_00331};
GN   Name=iscS {ECO:0000255|HAMAP-Rule:MF_00331}; Synonyms=nifS;
GN   OrderedLocusNames=BUsg_577;
OS   Buchnera aphidicola subsp. Schizaphis graminum (strain Sg).
OC   Bacteria; Proteobacteria; Gammaproteobacteria; Enterobacterales;
OC   Erwiniaceae; Buchnera.
OX   NCBI_TaxID=198804;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX   PubMed=9516544; DOI=10.1007/pl00006760;
RA   Clark M.A., Baumann L., Baumann P.;
RT   "Sequence analysis of a 34.7-kb DNA segment from the genome of Buchnera
RT   aphidicola (endosymbiont of aphids) containing groEL, dnaA, the atp operon,
RT   gidA, and rho.";
RL   Curr. Microbiol. 36:158-163(1998).
RN   [2]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=Sg;
RX   PubMed=12089438; DOI=10.1126/science.1071278;
RA   Tamas I., Klasson L., Canbaeck B., Naeslund A.K., Eriksson A.-S.,
RA   Wernegreen J.J., Sandstroem J.P., Moran N.A., Andersson S.G.E.;
RT   "50 million years of genomic stasis in endosymbiotic bacteria.";
RL   Science 296:2376-2379(2002).
CC   -!- FUNCTION: Master enzyme that delivers sulfur to a number of partners
CC       involved in Fe-S cluster assembly, tRNA modification or cofactor
CC       biosynthesis. Catalyzes the removal of elemental sulfur atoms from
CC       cysteine to produce alanine. Functions as a sulfur delivery protein for
CC       Fe-S cluster synthesis onto IscU, an Fe-S scaffold assembly protein, as
CC       well as other S acceptor proteins. {ECO:0000255|HAMAP-Rule:MF_00331}.
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; Evidence={ECO:0000255|HAMAP-
CC         Rule:MF_00331};
CC   -!- COFACTOR:
CC       Name=pyridoxal 5'-phosphate; Xref=ChEBI:CHEBI:597326;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_00331};
CC   -!- PATHWAY: Cofactor biosynthesis; iron-sulfur cluster biosynthesis.
CC       {ECO:0000255|HAMAP-Rule:MF_00331}.
CC   -!- SUBUNIT: Homodimer. Forms a heterotetramer with IscU, interacts with
CC       other sulfur acceptors. {ECO:0000255|HAMAP-Rule:MF_00331}.
CC   -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000255|HAMAP-Rule:MF_00331}.
CC   -!- SIMILARITY: Belongs to the class-V pyridoxal-phosphate-dependent
CC       aminotransferase family. NifS/IscS subfamily. {ECO:0000255|HAMAP-
CC       Rule:MF_00331}.
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DR   EMBL; AF008210; AAC38124.1; -; Genomic_DNA.
DR   EMBL; AE013218; AAM68111.1; -; Genomic_DNA.
DR   RefSeq; WP_011054077.1; NC_004061.1.
DR   AlphaFoldDB; O51886; -.
DR   SMR; O51886; -.
DR   STRING; 198804.BUsg_577; -.
DR   EnsemblBacteria; AAM68111; AAM68111; BUsg_577.
DR   KEGG; bas:BUsg_577; -.
DR   eggNOG; COG1104; Bacteria.
DR   HOGENOM; CLU_003433_0_2_6; -.
DR   OMA; APHIINF; -.
DR   OrthoDB; 839689at2; -.
DR   UniPathway; UPA00266; -.
DR   Proteomes; UP000000416; Chromosome.
DR   GO; GO:0005737; C:cytoplasm; IEA:UniProtKB-SubCell.
DR   GO; GO:0051537; F:2 iron, 2 sulfur cluster binding; IEA:UniProtKB-UniRule.
DR   GO; GO:0031071; F:cysteine desulfurase activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-KW.
DR   GO; GO:0030170; F:pyridoxal phosphate binding; IEA:UniProtKB-UniRule.
DR   GO; GO:0044571; P:[2Fe-2S] cluster assembly; IEA:UniProtKB-UniRule.
DR   Gene3D; 3.40.640.10; -; 1.
DR   Gene3D; 3.90.1150.10; -; 1.
DR   HAMAP; MF_00331; Cys_desulf_IscS; 1.
DR   InterPro; IPR000192; Aminotrans_V_dom.
DR   InterPro; IPR020578; Aminotrans_V_PyrdxlP_BS.
DR   InterPro; IPR010240; Cys_deSase_IscS.
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   PANTHER; PTHR11601:SF34; PTHR11601:SF34; 1.
DR   Pfam; PF00266; Aminotran_5; 1.
DR   PIRSF; PIRSF005572; NifS; 1.
DR   SUPFAM; SSF53383; SSF53383; 1.
DR   TIGRFAMs; TIGR02006; IscS; 1.
DR   PROSITE; PS00595; AA_TRANSFER_CLASS_5; 1.
PE   3: Inferred from homology;
KW   2Fe-2S; Cytoplasm; Iron; Iron-sulfur; Metal-binding; Pyridoxal phosphate;
KW   Transferase.
FT   CHAIN           1..404
FT                   /note="Cysteine desulfurase IscS"
FT                   /id="PRO_0000150262"
FT   ACT_SITE        328
FT                   /note="Cysteine persulfide intermediate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00331"
FT   BINDING         75..76
FT                   /ligand="pyridoxal 5'-phosphate"
FT                   /ligand_id="ChEBI:CHEBI:597326"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00331"
FT   BINDING         155
FT                   /ligand="pyridoxal 5'-phosphate"
FT                   /ligand_id="ChEBI:CHEBI:597326"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00331"
FT   BINDING         183
FT                   /ligand="pyridoxal 5'-phosphate"
FT                   /ligand_id="ChEBI:CHEBI:597326"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00331"
FT   BINDING         203..205
FT                   /ligand="pyridoxal 5'-phosphate"
FT                   /ligand_id="ChEBI:CHEBI:597326"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00331"
FT   BINDING         243
FT                   /ligand="pyridoxal 5'-phosphate"
FT                   /ligand_id="ChEBI:CHEBI:597326"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00331"
FT   BINDING         328
FT                   /ligand="[2Fe-2S] cluster"
FT                   /ligand_id="ChEBI:CHEBI:190135"
FT                   /ligand_note="ligand shared with IscU"
FT                   /note="via persulfide group"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00331"
FT   MOD_RES         206
FT                   /note="N6-(pyridoxal phosphate)lysine"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00331"
SQ   SEQUENCE   404 AA;  45144 MW;  3D1F46C7E71BB1E4 CRC64;
     MKNPIYLDYA ATTPVEFKVA KKMMNYLTID GIFGNPASRS HKFGWEAEEV IDIARNEISE
     LIGSDSREIV FTSGATEANN LAIKGIAFFH RKKGNHIITS KTEHKSVLDA CRYLESVGFS
     VTYLTPKNNG IIDLNDLKKN INKNTILVSI MHVNNETGII QDITNISKIC RSHDIFFHVD
     ATQSVGKIAI NLKNLFVDLM SFSAHKIYGP KGIGGLYVRR KPRVRLSALS HGGGHERGMR
     AGTLPVHQIV GMGESFKLAR KKINDDFIHL TNLRNDLWNG IKNIEEVYLN SDLKQGAPHI
     LNVSFNYIEG ESLIMALKDL AISSGSACTS SSLEPSYVLR ALGIKDELAH SSIRFSIGRF
     TTKEEIQHTV KSVHKSIHRL RALSPLWEMF KSGVDLNSIE WDHT
 
 
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