1WA1: Crystal Structure Of H313q Mutant Of Alcaligenes Xylosoxidans Nitrite Reductase

Dissimilatory nitrite reductase catalyses the reduction of nitrite to nitric oxide within the key biological process of denitrification. We present biochemical and structural results on two key mutants, one postulated to be important for the interaction with the partner protein and the other for substrate entry. Trp138, adjacent to one of the type-1 Cu ligands, is one of the residues surrounding a small depression speculated to be important in complex formation with the physiological redox partners, azurin I and II. Our data reveal that the Trp138His mutant is fully active using methyl viologen as an artificial electron donor, but there is a large decrease in activity using azurin I. These observations together with its crystal structure at a high resolution of 1.6 A confirm the importance of Trp138 in electron transfer and thus in productive interaction with azurin. A "hydrophobic pocket" on the protein surface has been identified as the channel through which nitrite may be guided to the catalytic type-2 Cu site. Glu133 and His313 at the opening of the pocket are conserved among most blue and green copper nitrite reductases (CuNiRs). The failure to soak the substrate into our high-resolution crystal form of native and mutant CuNiRs has been linked to the observation of an extraneous poly(ethylene glycol) (PEG) molecule interacting with His313. We present the crystal structure of His313Gln and the substrate-bound mutant at high resolutions of 1.65 and 1.72 A, respectively. The observation of the substrate-bound structure for the His313Gln mutant and inhibitory studies with PEG establishes the role of the hydrophobic pocket as the port of substrate entry.
PDB ID: 1WA1Download
MMDB ID: 51882
PDB Deposition Date: 2004/10/22
Updated in MMDB: 2012/12
Experimental Method:
x-ray diffraction
Resolution: 1.65  Å
Source Organism:
Similar Structures:
Biological Unit for 1WA1: trimeric; determined by author and by software (PQS)
Molecular Components in 1WA1
Label Count Molecule
Proteins (3 molecules)
Dissimilatory Copper-containing Nitrite Reductase
Molecule annotation
Chemicals (15 molecules)
* Click molecule labels to explore molecular sequence information.

Citing MMDB