ID   NIFK_AZOBR     STANDARD;      PRT;   521 AA.
AC   P25314;
DT   01-MAY-1992 (Rel. 22, Created)
DT   01-MAY-1992 (Rel. 22, Last sequence update)
DT   25-OCT-2004 (Rel. 45, Last annotation update)
DE   Nitrogenase molybdenum-iron protein beta chain (EC 1.18.6.1)
DE   (Nitrogenase component I) (Dinitrogenase).
GN   Name=nifK;
OS   Azospirillum brasilense.
OC   Bacteria; Proteobacteria; Alphaproteobacteria; Rhodospirillales;
OC   Rhodospirillaceae; Azospirillum.
OX   NCBI_TaxID=192;
RN   [1]
RP   NUCLEOTIDE SEQUENCE.
RX   MEDLINE=92370074; PubMed=1823284;
RA   Passaglia L.M.P., Nunes C.P., Zaha A., Schrank I.S.;
RT   "The nifHDK operon in the free-living nitrogen-fixing bacteria
RT   Azospirillum brasilense sequentially comprises genes H, D, K, an 353
RT   bp orf and gene Y.";
RL   Braz. J. Med. Biol. Res. 24:649-675(1991).
CC   -!- FUNCTION: The key enzymatic reactions in nitrogen fixation are
CC       catalyzed by the nitrogenase complex, which has 2 components: the
CC       iron protein and the molybdenum-iron protein.
CC   -!- CATALYTIC ACTIVITY: 3 reduced ferredoxin + 6 H(+) + N(2) + n ATP =
CC       3 oxidized ferredoxin + 2 NH(3) + n ADP + n phosphate.
CC   -!- SUBUNIT: Tetramer of two alpha and two beta chains that binds 30-
CC       32 Fe, 2 Mo, and inorganic sulfur.
CC   -!- SIMILARITY: Belongs to the nifD/nifK/nifE/nifN family.
CC   --------------------------------------------------------------------------
CC   This Swiss-Prot entry is copyright. It is produced through a collaboration
CC   between  the Swiss Institute of Bioinformatics  and the  EMBL outstation -
CC   the European Bioinformatics Institute.  There are no  restrictions on  its
CC   use as long as its content is in no way modified and this statement is not
CC   removed.
CC   --------------------------------------------------------------------------
DR   EMBL; M64344; AAB02344.1; -.
DR   PIR; S27475; S27475.
DR   HSSP; P07329; 1M1N.
DR   InterPro; IPR005976; NifK.
DR   InterPro; IPR000318; Nitrognse_comp1.
DR   InterPro; IPR000510; Oxred_nitrognse1.
DR   Pfam; PF00148; Oxidored_nitro; 1.
DR   TIGRFAMs; TIGR01286; nifK; 1.
DR   PROSITE; PS00699; NITROGENASE_1_1; 1.
DR   PROSITE; PS00090; NITROGENASE_1_2; 1.
KW   Iron-sulfur; Molybdenum; Nitrogen fixation; Oxidoreductase.
SQ   SEQUENCE   521 AA;  58216 MW;  4056110ED573DBA4 CRC64;
     MSMSHPVSQS ADKVIDHFTL FRQPEYKELF ERKKTEFEYG PTPTKEVARV SAWTKTEEYK
     EKNLPVEAVV INPTKACQPI GAMLAAQGFE GTLPFVHGSQ GCVSYYRTHL TRHFKEPNSA
     VSSSMTEDAA VFGGLNNMID GLQRYALYKP KMIAVLTTCM AEVIGDDLSG FINNAKNKES
     VPADFPVPFA HTPAFVGSHI VGYDNMIKGV LTHFWGTSEN FDTPKNETIN LIPGFDGFAV
     GNNRELKRIA GLFGIQMTIL SDVSDNFDTP ADGEYRMYDG GTPLEATKEA VHAKATISMQ
     EYCTPQSLQF IKREGPAGRQ AYNYPMGVTG TDELLMKLAE LSGKPSRGVK LERGRLVDAI
     ADSHTHLHGK RFAVYGDPDF CLGMSKFLME LGAEPVHILS TSGSKKWEKQ VQKVLDACRS
     ASSGKAYGAK DLWHLRSLVF TDKVDYIIGN SYGKYLERDT KIPLIRLTYP IFDRHHHHRY
     PTWGYQGALN VLVRILDRIF EDMDANTNIV GETDYSFDLV R
//