ISDA: 4HHW

Deposition Date 2012-10-10

Release Date 2012-11-21

Last Version Date 2025-03-26

Entry Detail

PDB ID:

4HHW

Keywords:

ELECTRON TRANSPORT

Title:

Crystal structure of the Pseudomonas aeruginosa azurin, H124NO YOH122

Biological Source:

Source Organism:

Pseudomonas aeruginosa (Taxon ID: 208964)

Host Organism:

Escherichia coli

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

2.00 Å

R-Value Free:

0.28

R-Value Work:

0.22

R-Value Observed:

0.22

Space Group:

P 2 21 21

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Macromolecular Entities

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Azurin
Gene (Uniprot):azu
Mutagens:W68F,Y92F,H103Q,Y128F,K142NIY,T144H
Chain IDs:A, B
Chain Length:128
Number of Molecules:2
Biological Source:Pseudomonas aeruginosa

UniProt ID:P00282 Pfam ID:PF00127

Modified Residue

Compound ID	Chain ID	Parent Comp ID	Details	2D Image
NIY	A	TYR	META-NITRO-TYROSINE

Ligand Molecules

Primary Citation

Electron Flow through Nitrotyrosinate in Pseudomonas aeruginosa Azurin.

Warren, J.J, Herrera, N, Hill, M.G, Winkler, J.R, Gray, H.B.Show

J.Am.Chem.Soc. 135 11151 11158 (2013)

PMID: 23859602 DOI: 10.1021/ja403734n

Abstact

We have designed ruthenium-modified Pseudomonas aeruginosa azurins that incorporate 3-nitrotyrosine (NO2YOH) between Ru(2,2'-bipyridine)2(imidazole)(histidine) and Cu redox centers in electron transfer (ET) pathways. We investigated the structures and reactivities of three different systems: RuH107NO2YOH109, RuH124NO2YOH122, and RuH126NO2YOH122. RuH107NO2YOH109, unlabeled H124NO2YOH122, and unlabeled H126NO2YOH122 were structurally characterized. The pKa's of NO2YOH at positions 122 and 109 are 7.2 and 6.0, respectively. Reduction potentials of 3-nitrotyrosinate (NO2YO(-))-modified azurins were estimated from cyclic and differential pulse voltammetry data: oxidation of NO2YO(-)122 occurs near 1.1 versus NHE; oxidation of NO2YO(-)109 is near 1.2 V. Our analysis of transient optical spectroscopic experiments indicates that hopping via NO2YO(-) enhances Cu(I) oxidation rates over single-step ET by factors of 32 (RuH107NO2YO(-)109), 46 (RuH126NO2YO(-)122), and 13 (RuH124NO2YO(-)122).

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Primary Citation of related structures

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