ID A0A1A8XTL8_9PROT Unreviewed; 522 AA.
AC A0A1A8XTL8;
DT 05-OCT-2016, integrated into UniProtKB/TrEMBL.
DT 05-OCT-2016, sequence version 1.
DT 24-JAN-2024, entry version 26.
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:SBT07872.1};
GN ORFNames=ACCAA_50109 {ECO:0000313|EMBL:SBT07872.1};
OS Candidatus Accumulibacter aalborgensis.
OC Bacteria; Pseudomonadota; Betaproteobacteria; Candidatus Accumulibacter.
OX NCBI_TaxID=1860102 {ECO:0000313|EMBL:SBT07872.1, ECO:0000313|Proteomes:UP000199169};
RN [1] {ECO:0000313|EMBL:SBT07872.1, ECO:0000313|Proteomes:UP000199169}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=3 {ECO:0000313|EMBL:SBT07872.1};
RA Kjaerup R.B., Dalgaard T.S., Juul-Madsen H.R.;
RL Submitted (JUN-2016) to the EMBL/GenBank/DDBJ databases.
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:RU004021}.
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DR EMBL; FLQX01000127; SBT07872.1; -; Genomic_DNA.
DR AlphaFoldDB; A0A1A8XTL8; -.
DR STRING; 1860102.ACCAA_50109; -.
DR Proteomes; UP000199169; Unassembled WGS sequence.
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; PS00699; NITROGENASE_1_1; 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:RU004021};
KW Nucleotide-binding {ECO:0000256|RuleBase:RU364127};
KW Oxidoreductase {ECO:0000256|RuleBase:RU364127,
KW ECO:0000313|EMBL:SBT07872.1};
KW Reference proteome {ECO:0000313|Proteomes:UP000199169}.
FT DOMAIN 2..55
FT /note="Nitrogenase molybdenum-iron protein beta chain N-
FT terminal"
FT /evidence="ECO:0000259|Pfam:PF11844"
FT DOMAIN 69..500
FT /note="Nitrogenase/oxidoreductase component 1"
FT /evidence="ECO:0000259|Pfam:PF00148"
SQ SEQUENCE 522 AA; 59154 MW; 0495AB2DC3915762 CRC64;
MQTAEKIKPC YPLFGDDDYR KSLTDKRELF EEGHSADKVR ETFLWTTTLE YQELNFKRQA
LTVDPAKACQ PLGAVLCASG FHKTLPYVHG SQGCVAYFRT YFNRHFREPC SCVSDSMTED
AAVFGGQKNM YDGLANAKAI YKPEMIAVST TCMAEVIGDD LNAFINNTKK EGHIPQEFPV
PFAHTPSFVG SHTTGWDNML EGIIRSFTLN TMADKKVGAN GKINIIPGFE TYLGNYRVIK
RMLDEMDVAY TFLCDPSEVF DTPTDGEFRM YAGGTTQDEI KDAPNALTTL LLQPTQLEKS
KKFIENTWNQ EIPKLNIPMG VDWTDEFLMK VSEVTGKEIP ESLAKERGRC MDLIADSHAW
LHGKKFALYG DPDFVLGMVK ILLEVGAEPT HIVCHNAHKR WGKVVEKLLE TSPFGVNGKV
YTGCDLWHMR SLCFTDKPDF LIGNSYGKYI QRDTRYKGEE FEVPLIRLGF PIFDRHHLHR
QTTLGYEGMM SIVTQLTNAV LEQLDRETIG MATTDYNFDL VR
//
