Structure of PDB 1qgu Chain B

Receptor sequence

>1qguB (length=519) Species: 573 (Klebsiella pneumoniae)

SQTIDKINSCYPLFEQDEYQELFRNKRQLEEAHDAQRVQEVFAWTTTAEY
EALNFRREALTVDPAKACQPLGAVLCSLGFANTLPYVHGSQGCVAYFRTY
FNRHFKEPIACVSDSMTEDAAVFGGNNNMNLGLQNASALYKPEIIAVSTT
CMAEVIGDDLQAFIANAKKDGFVDSSIAVPHAHTPSFIGSHVTGWDNMFE
GFAKTFTADYQGQPGKLPKLNLVTGFETYLGNFRVLKRMMEQMAVPCSLL
SDPSEVLDTPADGHYRMYSGGTTQQEMKEAPDAIDTLLLQPWQLLKSKKV
VQEMWNQPATEVAIPLGLAATDELLMTVSQLSGKPIADALTLERGRLVDM
MLDSHTWLHGKKFGLYGDPDFVMGLTRFLLELGCEPTVILSHNANKRWQK
AMNKMLDASPYGRDSEVFINCDLWHFRSLMFTRQPDFMIGNSYGKFIQRD
TLAKGKAFEVPLIRLGFPLFDRHHLHRQTTWGYEGAMNIVTTLVNAVLEK
LDSDTSQLGKTDYSFDLVR

3D structure

• PDB: 1qgu New insights into structure-function relationships in nitrogenase: A 1.6 A resolution X-ray crystallographic study of Klebsiella pneumoniae MoFe-protein.
• Chain: B
• Resolution: 1.6 Å

Enzymatic activity

• Catalytic site (original residue number in PDB): C151 V155
• Catalytic site (residue number reindexed from 1): C151 V155
• Enzyme Commision number: 1.18.6.1: nitrogenase.

Interaction with ligand

Site #	Ligand	Ligand chain	Binding residues on receptor (original residue number in PDB)	Binding residues on receptor (residue number reindexed from 1)	Binding affinity
BS01	CLF	B	C68 S90 G92 C93 Y96 T150 C151 S186	C68 S90 G92 C93 Y96 T150 C151 S186
BS02	MG	B	D349 D353	D349 D353
BS03	MG	B	K106 E107	K106 E107

Gene Ontology

Molecular Function

• GO:0005524 ATP binding
• GO:0016163 nitrogenase activity
• GO:0016491 oxidoreductase activity
• GO:0046872 metal ion binding
• GO:0051536 iron-sulfur cluster binding

Biological Process

• GO:0009399 nitrogen fixation

Cellular Component

• GO:0016612 molybdenum-iron nitrogenase complex

External links

• PDB: RCSB:1qgu, PDBe:1qgu, PDBj:1qgu
• PDBsum: 1qgu
• PubMed: 10525412
• UniProt: P09772|NIFK_KLEPN Nitrogenase molybdenum-iron protein beta chain (Gene Name=nifK)