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1cc3

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{{STRUCTURE_1cc3| PDB=1cc3 | SCENE= }}
{{STRUCTURE_1cc3| PDB=1cc3 | SCENE= }}
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'''PURPLE CUA CENTER'''
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===PURPLE CUA CENTER===
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==Overview==
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The X-ray structure of an engineered purple CuA center in azurin from Pseudomonas aeruginosa has been determined and refined at 1.65 A resolution. Two independent purple CuA azurin molecules are in the asymmetric unit of a new P21 crystal, and they have nearly identical conformations (rmsd of 0.27 A for backbone atoms). The purple CuA azurin was produced by the loop-engineering strategy, and the resulting overall structure is unperturbed. The insertion of a slightly larger Cu-binding loop into azurin causes the two structural domains of azurin to move away from each other. The high-resolution structure reveals the detailed environment of the delocalized mixed-valence [Cu(1.5).Cu(1.5)] binuclear purple CuA center, which serves as a useful reference model for other native proteins, and provides a firm basis for understanding results from spectroscopic and functional studies of this class of copper center in biology. The two independent Cu-Cu distances of 2.42 and 2.35 A (with respective concomitant adjustments of ligand-Cu distances) are consistent with that (2.39 A) obtained from X-ray absorption spectroscopy with the same molecule, and are among the shortest Cu-Cu bonds observed to date in proteins or inorganic complexes. A comparison of the purple CuA azurin structure with those of other CuA centers reveals an important relationship between the angular position of the two His imidazole rings with respect to the Cu2S2(Cys) core plane and the distance between the Cu and the axial ligand. This relationship strongly suggests that the fine structural variation of different CuA centers can be correlated with the angular positions of the two histidine rings because, from these positions, one can predict the relative axial ligand interactions, which are responsible for modulating the Cu-Cu distance and the electron transfer properties of the CuA centers.
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(as it appears on PubMed at http://www.pubmed.gov), where 10231517 is the PubMed ID number.
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{{ABSTRACT_PUBMED_10231517}}
==About this Structure==
==About this Structure==
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[[Category: Wang, A H.J.]]
[[Category: Wang, A H.J.]]
[[Category: Copper-a]]
[[Category: Copper-a]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 20:32:14 2008''

Revision as of 17:32, 30 June 2008

Image:1cc3.png

Template:STRUCTURE 1cc3

PURPLE CUA CENTER

Template:ABSTRACT PUBMED 10231517

About this Structure

1CC3 is a Single protein structure of sequence from Pseudomonas aeruginosa. Full crystallographic information is available from OCA.

Reference

Structural basis of electron transfer modulation in the purple CuA center., Robinson H, Ang MC, Gao YG, Hay MT, Lu Y, Wang AH, Biochemistry. 1999 May 4;38(18):5677-83. PMID:10231517

Page seeded by OCA on Mon Jun 30 20:32:14 2008

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