Structure of PDB 1l9q Chain B

Receptor sequence

>1l9qB (length=336) Species: 511 (Alcaligenes faecalis)

ATAAEIAALPRQKVELVDPPFVHAHSQVAEGGPKVVEFTMVIEEKKIVID
DAGTEVHAMAFNGTVPGPLMVVHQDDYLELTLINPETNTLMHNIDFHAAT
GALGGGGLTEINPGEKTILRFKATKPGVFVYHCAPPGMVPWHVVSGMNGA
IMVLPREGLHDGKGKALTYDKIYYVGEQDFYVPRDENGKYKKYEAPGDAY
EDTVKVMRTLTPTHVVFNGAVGALTGDKAMTAAVGEKVLIVHSQANRDTR
PHLLGGHGDYVWATGKFNTPPDVDQETWFIPGGAAGAAFYTFQQPGIYAY
VNHNLIEAFELGAAAHFKVTGEWNDDLMTSVLAPSG

3D structure

• PDB: 1l9q Directing the mode of nitrite binding to a copper-containing nitrite reductase from Alcaligenes faecalis S-6: Characterization of an active site isoleucine
• Chain: B
• Resolution: 1.7 Å

Enzymatic activity

• Catalytic site (original residue number in PDB): H95 D98 H100 H135 C136 H145 M150 H255 E279 T280 H306
• Catalytic site (residue number reindexed from 1): H92 D95 H97 H132 C133 H142 M147 H252 E276 T277 H303
• Enzyme Commision number: 1.7.2.1: nitrite reductase (NO-forming).

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	NO2	B	H255 L257 H306	H252 L254 H303
BS02	CU	B	H95 C136 H145 M150	H92 C133 H142 M147
BS03	CU	B	H100 H135	H97 H132
BS04	NO2	B	D98 H100 H135	D95 H97 H132

Gene Ontology

Molecular Function

• GO:0005507 copper ion binding
• GO:0016491 oxidoreductase activity
• GO:0046872 metal ion binding
• GO:0050421 nitrite reductase (NO-forming) activity

Biological Process

• GO:0019333 denitrification pathway
• GO:0042128 nitrate assimilation

Cellular Component

• GO:0042597 periplasmic space

External links

• PDB: RCSB:1l9q, PDBe:1l9q, PDBj:1l9q
• PDBsum: 1l9q
• PubMed: 12538888
• UniProt: P38501|NIR_ALCFA Copper-containing nitrite reductase (Gene Name=nirK)