Structure of PDB 6zu6 Chain A

Receptor sequence

>6zu6A (length=333) Species: 223 (Achromobacter cycloclastes)

VDISTLPRVKVDLVKPPFVHAHDQVAKTGPRVVEFTMTIEEKKLVIDREG
TEIHAMTFNGSVPGPLMVVHENDYVELRLINPDTNTLLHNIDFHAATGAL
GGGALTQVNPGEETTLRFKATKPGVFVYHCAPEGMVPWHVTSGMNGAIMV
LPRDGLKDEKGQPLTYDKIYYVGEQDFYVPKDEAGNYKKYETPGEAYEDA
VKAMRTLTPTHIVFNGAVGALTGDHALTAAVGERVLVVHSQANRDTRPHL
IGGHGDYVWATGKFRNPPDLDQETWLIPGGTAGAAFYTFRQPGVYAYVNH
NLIEAFELGAAGHFKVTGEWNDDLMTSVVKPAS

3D structure

• PDB: 6zu6 Nature of the copper-nitrosyl intermediates of copper nitrite reductases during catalysis.
• Chain: A
• Resolution: 1.15 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): H89 D92 H94 H129 C130 H139 M144 H249 E273 T274 H300
• 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	CU	A	H95 C136 H145 M150	H89 C130 H139 M144
BS02	CU	A	H100 H135	H94 H129
BS03	NO2	A	D98 H100 H135	D92 H94 H129
BS04	NO2	A	W265 T267 K269 N272	W259 T261 K263 N266

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:6zu6, PDBe:6zu6, PDBj:6zu6
• PDBsum: 6zu6
• PubMed: 34094452
• UniProt: P25006|NIR_ACHCY Copper-containing nitrite reductase (Gene Name=nirK)