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NRFA_HAEIN
ID   NRFA_HAEIN              Reviewed;         538 AA.
AC   P45017;
DT   01-NOV-1995, integrated into UniProtKB/Swiss-Prot.
DT   01-NOV-1995, sequence version 1.
DT   03-AUG-2022, entry version 151.
DE   RecName: Full=Cytochrome c-552 {ECO:0000255|HAMAP-Rule:MF_01182};
DE            EC=1.7.2.2 {ECO:0000255|HAMAP-Rule:MF_01182};
DE   AltName: Full=Ammonia-forming cytochrome c nitrite reductase {ECO:0000255|HAMAP-Rule:MF_01182};
DE            Short=Cytochrome c nitrite reductase {ECO:0000255|HAMAP-Rule:MF_01182};
DE   Flags: Precursor;
GN   Name=nrfA {ECO:0000255|HAMAP-Rule:MF_01182}; OrderedLocusNames=HI_1069;
OS   Haemophilus influenzae (strain ATCC 51907 / DSM 11121 / KW20 / Rd).
OC   Bacteria; Proteobacteria; Gammaproteobacteria; Pasteurellales;
OC   Pasteurellaceae; Haemophilus.
OX   NCBI_TaxID=71421;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 51907 / DSM 11121 / KW20 / Rd;
RX   PubMed=7542800; DOI=10.1126/science.7542800;
RA   Fleischmann R.D., Adams M.D., White O., Clayton R.A., Kirkness E.F.,
RA   Kerlavage A.R., Bult C.J., Tomb J.-F., Dougherty B.A., Merrick J.M.,
RA   McKenney K., Sutton G.G., FitzHugh W., Fields C.A., Gocayne J.D.,
RA   Scott J.D., Shirley R., Liu L.-I., Glodek A., Kelley J.M., Weidman J.F.,
RA   Phillips C.A., Spriggs T., Hedblom E., Cotton M.D., Utterback T.R.,
RA   Hanna M.C., Nguyen D.T., Saudek D.M., Brandon R.C., Fine L.D.,
RA   Fritchman J.L., Fuhrmann J.L., Geoghagen N.S.M., Gnehm C.L., McDonald L.A.,
RA   Small K.V., Fraser C.M., Smith H.O., Venter J.C.;
RT   "Whole-genome random sequencing and assembly of Haemophilus influenzae
RT   Rd.";
RL   Science 269:496-512(1995).
CC   -!- FUNCTION: Catalyzes the reduction of nitrite to ammonia, consuming six
CC       electrons in the process. {ECO:0000255|HAMAP-Rule:MF_01182}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=6 Fe(III)-[cytochrome c] + 2 H2O + NH4(+) = 6 Fe(II)-
CC         [cytochrome c] + 8 H(+) + nitrite; Xref=Rhea:RHEA:13089, Rhea:RHEA-
CC         COMP:10350, Rhea:RHEA-COMP:14399, ChEBI:CHEBI:15377,
CC         ChEBI:CHEBI:15378, ChEBI:CHEBI:16301, ChEBI:CHEBI:28938,
CC         ChEBI:CHEBI:29033, ChEBI:CHEBI:29034; EC=1.7.2.2;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_01182};
CC   -!- COFACTOR:
CC       Name=Ca(2+); Xref=ChEBI:CHEBI:29108;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_01182};
CC       Note=Binds 1 Ca(2+) ion per monomer. {ECO:0000255|HAMAP-Rule:MF_01182};
CC   -!- COFACTOR:
CC       Name=heme c; Xref=ChEBI:CHEBI:61717;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_01182};
CC       Note=Binds 5 heme c groups covalently per monomer. {ECO:0000255|HAMAP-
CC       Rule:MF_01182};
CC   -!- PATHWAY: Nitrogen metabolism; nitrate reduction (assimilation).
CC       {ECO:0000255|HAMAP-Rule:MF_01182}.
CC   -!- SUBCELLULAR LOCATION: Periplasm {ECO:0000255|HAMAP-Rule:MF_01182}.
CC   -!- SIMILARITY: Belongs to the cytochrome c-552 family. {ECO:0000255|HAMAP-
CC       Rule:MF_01182}.
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DR   EMBL; L42023; AAC22727.1; -; Genomic_DNA.
DR   PIR; C64181; C64181.
DR   RefSeq; NP_439227.3; NC_000907.1.
DR   AlphaFoldDB; P45017; -.
DR   SMR; P45017; -.
DR   STRING; 71421.HI_1069; -.
DR   EnsemblBacteria; AAC22727; AAC22727; HI_1069.
DR   KEGG; hin:HI_1069; -.
DR   PATRIC; fig|71421.8.peg.1113; -.
DR   eggNOG; COG3303; Bacteria.
DR   HOGENOM; CLU_035040_1_0_6; -.
DR   OMA; EMVILWA; -.
DR   PhylomeDB; P45017; -.
DR   BioCyc; HINF71421:G1GJ1-1105-MON; -.
DR   UniPathway; UPA00653; -.
DR   Proteomes; UP000000579; Chromosome.
DR   GO; GO:0030288; C:outer membrane-bounded periplasmic space; IBA:GO_Central.
DR   GO; GO:0005509; F:calcium ion binding; IEA:UniProtKB-UniRule.
DR   GO; GO:0020037; F:heme binding; IBA:GO_Central.
DR   GO; GO:0005506; F:iron ion binding; IEA:UniProtKB-UniRule.
DR   GO; GO:0042279; F:nitrite reductase (cytochrome, ammonia-forming) activity; IBA:GO_Central.
DR   GO; GO:0019645; P:anaerobic electron transport chain; IBA:GO_Central.
DR   GO; GO:0042128; P:nitrate assimilation; IEA:UniProtKB-UniPathway.
DR   CDD; cd00548; NrfA-like; 1.
DR   HAMAP; MF_01182; Cytochrom_C552; 1.
DR   InterPro; IPR003321; Cyt_c552.
DR   InterPro; IPR017570; Cyt_c_NO2Rdtase_formate-dep.
DR   InterPro; IPR036280; Multihaem_cyt_sf.
DR   PANTHER; PTHR30633; PTHR30633; 1.
DR   Pfam; PF02335; Cytochrom_C552; 1.
DR   PIRSF; PIRSF000243; Cyt_c552; 1.
DR   SUPFAM; SSF48695; SSF48695; 1.
DR   TIGRFAMs; TIGR03152; cyto_c552_HCOOH; 1.
DR   PROSITE; PS51008; MULTIHEME_CYTC; 1.
PE   3: Inferred from homology;
KW   Calcium; Electron transport; Heme; Iron; Metal-binding; Oxidoreductase;
KW   Periplasm; Reference proteome; Signal; Transport.
FT   SIGNAL          1..55
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01182"
FT   CHAIN           56..538
FT                   /note="Cytochrome c-552"
FT                   /id="PRO_0000006579"
FT   BINDING         133
FT                   /ligand="heme c"
FT                   /ligand_id="ChEBI:CHEBI:61717"
FT                   /ligand_label="3"
FT                   /ligand_part="Fe"
FT                   /ligand_part_id="ChEBI:CHEBI:18248"
FT                   /note="axial binding residue"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01182"
FT   BINDING         161
FT                   /ligand="heme"
FT                   /ligand_id="ChEBI:CHEBI:30413"
FT                   /ligand_label="1"
FT                   /note="covalent"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01182"
FT   BINDING         164
FT                   /ligand="heme"
FT                   /ligand_id="ChEBI:CHEBI:30413"
FT                   /ligand_label="1"
FT                   /note="covalent"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01182"
FT   BINDING         165
FT                   /ligand="heme"
FT                   /ligand_id="ChEBI:CHEBI:30413"
FT                   /ligand_label="1"
FT                   /ligand_part="Fe"
FT                   /ligand_part_id="ChEBI:CHEBI:18248"
FT                   /note="axial binding residue"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01182"
FT   BINDING         199
FT                   /ligand="heme c"
FT                   /ligand_id="ChEBI:CHEBI:61717"
FT                   /ligand_label="2"
FT                   /note="covalent"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01182"
FT   BINDING         202
FT                   /ligand="heme c"
FT                   /ligand_id="ChEBI:CHEBI:61717"
FT                   /ligand_label="2"
FT                   /note="covalent"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01182"
FT   BINDING         203
FT                   /ligand="heme c"
FT                   /ligand_id="ChEBI:CHEBI:61717"
FT                   /ligand_label="2"
FT                   /ligand_part="Fe"
FT                   /ligand_part_id="ChEBI:CHEBI:18248"
FT                   /note="axial binding residue"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01182"
FT   BINDING         264
FT                   /ligand="heme c"
FT                   /ligand_id="ChEBI:CHEBI:61717"
FT                   /ligand_label="3"
FT                   /note="covalent"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01182"
FT   BINDING         267
FT                   /ligand="heme c"
FT                   /ligand_id="ChEBI:CHEBI:61717"
FT                   /ligand_label="3"
FT                   /note="covalent"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01182"
FT   BINDING         268
FT                   /ligand="heme c"
FT                   /ligand_id="ChEBI:CHEBI:61717"
FT                   /ligand_label="3"
FT                   /ligand_part="Fe"
FT                   /ligand_part_id="ChEBI:CHEBI:18248"
FT                   /note="axial binding residue"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01182"
FT   BINDING         270
FT                   /ligand="Ca(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29108"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01182"
FT   BINDING         271
FT                   /ligand="Ca(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29108"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01182"
FT   BINDING         271
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01182"
FT   BINDING         316
FT                   /ligand="Ca(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29108"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01182"
FT   BINDING         318
FT                   /ligand="Ca(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29108"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01182"
FT   BINDING         319
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01182"
FT   BINDING         330
FT                   /ligand="heme c"
FT                   /ligand_id="ChEBI:CHEBI:61717"
FT                   /ligand_label="5"
FT                   /ligand_part="Fe"
FT                   /ligand_part_id="ChEBI:CHEBI:18248"
FT                   /note="axial binding residue"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01182"
FT   BINDING         337
FT                   /ligand="heme c"
FT                   /ligand_id="ChEBI:CHEBI:61717"
FT                   /ligand_label="4"
FT                   /note="covalent"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01182"
FT   BINDING         340
FT                   /ligand="heme c"
FT                   /ligand_id="ChEBI:CHEBI:61717"
FT                   /ligand_label="4"
FT                   /note="covalent"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01182"
FT   BINDING         341
FT                   /ligand="heme c"
FT                   /ligand_id="ChEBI:CHEBI:61717"
FT                   /ligand_label="4"
FT                   /ligand_part="Fe"
FT                   /ligand_part_id="ChEBI:CHEBI:18248"
FT                   /note="axial binding residue"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01182"
FT   BINDING         356
FT                   /ligand="heme c"
FT                   /ligand_id="ChEBI:CHEBI:61717"
FT                   /ligand_label="2"
FT                   /ligand_part="Fe"
FT                   /ligand_part_id="ChEBI:CHEBI:18248"
FT                   /note="axial binding residue"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01182"
FT   BINDING         369
FT                   /ligand="heme c"
FT                   /ligand_id="ChEBI:CHEBI:61717"
FT                   /ligand_label="5"
FT                   /note="covalent"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01182"
FT   BINDING         372
FT                   /ligand="heme c"
FT                   /ligand_id="ChEBI:CHEBI:61717"
FT                   /ligand_label="5"
FT                   /note="covalent"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01182"
FT   BINDING         373
FT                   /ligand="heme c"
FT                   /ligand_id="ChEBI:CHEBI:61717"
FT                   /ligand_label="5"
FT                   /ligand_part="Fe"
FT                   /ligand_part_id="ChEBI:CHEBI:18248"
FT                   /note="axial binding residue"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01182"
FT   BINDING         448
FT                   /ligand="heme c"
FT                   /ligand_id="ChEBI:CHEBI:61717"
FT                   /ligand_label="4"
FT                   /ligand_part="Fe"
FT                   /ligand_part_id="ChEBI:CHEBI:18248"
FT                   /note="axial binding residue"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01182"
SQ   SEQUENCE   538 AA;  60400 MW;  48E64B46F2FB9CBB CRC64;
     MKIYLRFVWI LIIILNFLLN LFITTNGVII VNAFKKSLIV AASFASLSLF NSATAELVYK
     PLEQPVEPAK PDLKIESVNE KFAEKYPNQY NSWRSTANGD GENIIYADEE NPRLIVLWGG
     YAFAKEYNAP RGHFYAVTDV RNILRTGAPK TANDGPQAMA CWTCKGPDVP RLIAEWGEKD
     YFNAKWAKGG PEIVNSIGCA DCHDTTSKDF AEGKPALRIA RPHVLRALDA LEKATAEKDK
     AEGRPHNNLS FNTAARTEKR AEICANCHVE YYFAGDIKQV TFPWDNGQTV DDIEKYYDDI
     GFTDWTHSLS KAPMLKAQHP DFEIWSLGMH GKNGVTCVDC HMPKVQGADG KVYTDHQIQN
     PFEAFDSTCA NCHDQSKEKL RDIVTSRKKE VKDVMGRLED QVVKAHFEAK EAWDAGATKK
     EMEAALMDIR HAQWRWDYTA ASHGGHMHAP EVVLRVLASG LDKVADARTK LAVILTKHGV
     KTPVQIPDIS TADKAWKVMG IDIEKERKAK EEFLKTVVPQ WEQQAREKGL LVDPPAQK
 
 
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