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4azu

From Proteopedia

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[[Image:4azu.gif|left|200px]]
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{{STRUCTURE_4azu| PDB=4azu | SCENE= }}
{{STRUCTURE_4azu| PDB=4azu | SCENE= }}
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'''CRYSTAL STRUCTURE ANALYSIS OF OXIDIZED PSEUDOMONAS AERUGINOSA AZURIN AT PH 5.5 AND PH 9.0. A PH-INDUCED CONFORMATIONAL TRANSITION INVOLVES A PEPTIDE BOND FLIP'''
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===CRYSTAL STRUCTURE ANALYSIS OF OXIDIZED PSEUDOMONAS AERUGINOSA AZURIN AT PH 5.5 AND PH 9.0. A PH-INDUCED CONFORMATIONAL TRANSITION INVOLVES A PEPTIDE BOND FLIP===
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==Overview==
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The X-ray crystal structure of recombinant wild-type azurin from Pseudomonas aeruginosa was determined by difference Fourier techniques using phases derived from the structure of the mutant His35Leu. Two data sets were collected from a single crystal of oxidized azurin soaked in mother liquor buffered at pH 5.5 and pH 9.0, respectively. Both data sets extend to 1.93 A resolution. The two pH forms were refined independently to crystallographic R-factors of 17.6% (pH 5.5) and 17.5% (pH 9.0). The conformational transition previously attributed to the protonation/deprotonation of residue His35 (pKa(red) = 7.3, pKa(ox) = 6.2), which lies in a crevice of the protein close to the copper binding site, involves a concomitant Pro36-Gly37 main-chain peptide bond flip. At the lower pH, the protonated imidazole N delta 1 of His35 forms a strong hydrogen bond with the carbonyl oxygen from Pro36, while at alkaline pH the deprotonated N delta 1 acts as an acceptor of a weak hydrogen bond from HN Gly37. The structure of the remainder of the azurin molecule, including the copper binding site, is not significantly affected by this transition.
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{{ABSTRACT_PUBMED_1942029}}
==About this Structure==
==About this Structure==
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[[Category: Messerschmidt, A.]]
[[Category: Messerschmidt, A.]]
[[Category: Nar, H.]]
[[Category: Nar, H.]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Jul 3 13:29:14 2008''

Revision as of 10:29, 3 July 2008

Image:4azu.png

Template:STRUCTURE 4azu

CRYSTAL STRUCTURE ANALYSIS OF OXIDIZED PSEUDOMONAS AERUGINOSA AZURIN AT PH 5.5 AND PH 9.0. A PH-INDUCED CONFORMATIONAL TRANSITION INVOLVES A PEPTIDE BOND FLIP

Template:ABSTRACT PUBMED 1942029

About this Structure

4AZU is a Single protein structure of sequence from Pseudomonas aeruginosa. Full crystallographic information is available from OCA.

Reference

Crystal structure analysis of oxidized Pseudomonas aeruginosa azurin at pH 5.5 and pH 9.0. A pH-induced conformational transition involves a peptide bond flip., Nar H, Messerschmidt A, Huber R, van de Kamp M, Canters GW, J Mol Biol. 1991 Oct 5;221(3):765-72. PMID:1942029

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