ID D2CNA3_9NOST Unreviewed; 511 AA.
AC D2CNA3;
DT 09-FEB-2010, integrated into UniProtKB/TrEMBL.
DT 09-FEB-2010, sequence version 1.
DT 24-JAN-2024, entry version 29.
DE RecName: Full=Nitrogenase molybdenum-iron protein beta chain {ECO:0000256|ARBA:ARBA00014775, ECO:0000256|RuleBase:RU364127};
DE EC=1.18.6.1 {ECO:0000256|ARBA:ARBA00012773, ECO:0000256|RuleBase:RU364127};
DE AltName: Full=Dinitrogenase {ECO:0000256|RuleBase:RU364127};
GN Name=nifK {ECO:0000313|EMBL:ACA61794.1};
OS Cylindrospermum stagnale PCC 7417.
OC Bacteria; Cyanobacteriota; Cyanophyceae; Nostocales; Nostocaceae;
OC Cylindrospermum.
OX NCBI_TaxID=56107 {ECO:0000313|EMBL:ACA61794.1};
RN [1] {ECO:0000313|EMBL:ACA61794.1}
RP NUCLEOTIDE SEQUENCE.
RC STRAIN=PCC 7417 {ECO:0000313|EMBL:ACA61794.1};
RX PubMed=20640414; DOI=10.1007/s00239-010-9365-8;
RA Hartmann L.S., Barnum S.R.;
RT "Inferring the evolutionary history of Mo-dependent nitrogen fixation from
RT phylogenetic studies of nifK and nifDK.";
RL J. Mol. Evol. 71:70-85(2010).
CC -!- FUNCTION: This molybdenum-iron protein is part of the nitrogenase
CC complex that catalyzes the key enzymatic reactions in nitrogen
CC fixation. {ECO:0000256|ARBA:ARBA00002621,
CC ECO:0000256|RuleBase:RU364127}.
CC -!- CATALYTIC ACTIVITY:
CC Reaction=16 ATP + 16 H2O + N2 + 8 reduced [2Fe-2S]-[ferredoxin] = 16
CC ADP + 6 H(+) + H2 + 2 NH4(+) + 8 oxidized [2Fe-2S]-[ferredoxin] + 16
CC phosphate; Xref=Rhea:RHEA:21448, Rhea:RHEA-COMP:10000, Rhea:RHEA-
CC COMP:10001, ChEBI:CHEBI:15377, ChEBI:CHEBI:15378, ChEBI:CHEBI:17997,
CC ChEBI:CHEBI:18276, ChEBI:CHEBI:28938, ChEBI:CHEBI:30616,
CC ChEBI:CHEBI:33737, ChEBI:CHEBI:33738, ChEBI:CHEBI:43474,
CC ChEBI:CHEBI:456216; EC=1.18.6.1;
CC Evidence={ECO:0000256|ARBA:ARBA00000805,
CC ECO:0000256|RuleBase:RU364127};
CC -!- COFACTOR:
CC Name=[8Fe-7S] cluster; Xref=ChEBI:CHEBI:21143;
CC Evidence={ECO:0000256|RuleBase:RU364127};
CC Note=Binds 1 [8Fe-7S] cluster per heterodimer.
CC {ECO:0000256|RuleBase:RU364127};
CC -!- SUBUNIT: Tetramer of two alpha and two beta chains. Forms complex with
CC the iron protein (nitrogenase component 2).
CC {ECO:0000256|ARBA:ARBA00011462, ECO:0000256|RuleBase:RU364127}.
CC -!- SIMILARITY: Belongs to the NifD/NifK/NifE/NifN family.
CC {ECO:0000256|ARBA:ARBA00011002, ECO:0000256|RuleBase:RU364127}.
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DR EMBL; EU358080; ACA61794.1; -; Genomic_DNA.
DR AlphaFoldDB; D2CNA3; -.
DR GO; GO:0016612; C:molybdenum-iron nitrogenase complex; IEA:InterPro.
DR GO; GO:0005524; F:ATP binding; IEA:UniProtKB-KW.
DR GO; GO:0018697; F:carbonyl sulfide nitrogenase 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:0016163; F:nitrogenase activity; IEA:UniProtKB-EC.
DR GO; GO:0009399; P:nitrogen fixation; IEA:UniProtKB-KW.
DR CDD; cd01974; Nitrogenase_MoFe_beta; 1.
DR Gene3D; 3.40.50.1980; Nitrogenase molybdenum iron protein domain; 3.
DR Gene3D; 1.20.89.10; Nitrogenase Molybdenum-iron Protein, subunit B, domain 4; 1.
DR InterPro; IPR000510; Nase/OxRdtase_comp1.
DR InterPro; IPR000318; Nase_comp1_CS.
DR InterPro; IPR005976; Nase_Mo-Fe_CF_bsu.
DR InterPro; IPR024564; Nase_Mo-Fe_CF_bsu_N.
DR NCBIfam; TIGR01286; nifK; 1.
DR PANTHER; PTHR33712; LIGHT-INDEPENDENT PROTOCHLOROPHYLLIDE REDUCTASE SUBUNIT B; 1.
DR PANTHER; PTHR33712:SF7; LIGHT-INDEPENDENT PROTOCHLOROPHYLLIDE REDUCTASE SUBUNIT B; 1.
DR Pfam; PF11844; DUF3364; 1.
DR Pfam; PF00148; Oxidored_nitro; 1.
DR SUPFAM; SSF53807; Helical backbone' metal receptor; 1.
DR PROSITE; PS00090; NITROGENASE_1_2; 1.
PE 3: Inferred from homology;
KW ATP-binding {ECO:0000256|RuleBase:RU364127};
KW Iron {ECO:0000256|RuleBase:RU364127};
KW Iron-sulfur {ECO:0000256|RuleBase:RU364127};
KW Metal-binding {ECO:0000256|RuleBase:RU364127};
KW Nitrogen fixation {ECO:0000256|ARBA:ARBA00023231,
KW ECO:0000256|RuleBase:RU364127};
KW Nucleotide-binding {ECO:0000256|RuleBase:RU364127};
KW Oxidoreductase {ECO:0000256|RuleBase:RU364127}.
FT DOMAIN 1..55
FT /note="Nitrogenase molybdenum-iron protein beta chain N-
FT terminal"
FT /evidence="ECO:0000259|Pfam:PF11844"
FT DOMAIN 69..489
FT /note="Nitrogenase/oxidoreductase component 1"
FT /evidence="ECO:0000259|Pfam:PF00148"
SQ SEQUENCE 511 AA; 57255 MW; 53331D5C32DC44C9 CRC64;
MPQNPEKIQD HVELFHQPEY QQLFENKKQF ENGHSPEEVQ RVAEWTKSWE YREKNFAREA
LTVNPAKGCQ PLGAIFAAVG FEGTLPFVQG SQGCVAYFRT HLTRHYKEPF SGVSSSMTED
AAVFGGLQNM IDGLANSYTL YKPKMIAVCT TCMAEVIGDD LQAFINNAKS AGSVPQDFPV
PYAHTPSFVG SHITGYDNML KGILSNLTAG KKKATSNGKI NFIPGFDTYV GNNREIKRIA
ALFGFDYTIL ADNSDYLDSP NTGEFDMYPG GTKLEDAADS INAKATIALQ AHSTAKTREY
IAKEWKQPVT VCRPWGIKAT DEFLMKLSEL SGTPIPEELE IERGRAVDAM TDSHSWVHGK
RFAIYGEPDL VYSVVGFMLE MGAEPVHILV NNSNEVFEKE LQAMLDASPF GKSATIWGGK
DLWHMRSLMF TEPVDLLIGN SYGKYLWRDT KTPLVRIGYP IMDRHHLHRY STIGYQGVIN
LLNWIVNTIF DDIDHNTNIP SKTDISFDLI R
//
