1wr5

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[[Image:1wr5.gif|left|200px]]
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{{STRUCTURE_1wr5| PDB=1wr5 | SCENE= }}
{{STRUCTURE_1wr5| PDB=1wr5 | SCENE= }}
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'''Three dimensional Structure of the E41K mutant of Tetraheme Cytochrome c3 from Desulfovibrio vulgaris Miyazaki F'''
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===Three dimensional Structure of the E41K mutant of Tetraheme Cytochrome c3 from Desulfovibrio vulgaris Miyazaki F===
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==Overview==
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Tyrosine 43 is positioned parallel to the fifth heme axial ligand, His34, of heme 1 in the tetraheme cytochrome c(3). The replacement of tyrosine with leucine increased the redox potential of heme 1 by 44 and 35 mV at the first and last reduction steps, respectively; its effects on the other hemes are small. In contrast, the Y43F mutation hardly changed the potentials. It shows that the aromatic ring at this position contributes to lowering the redox potential of heme 1 locally, although this cannot be the major contribution to the extremely low redox potentials of cytochrome c(3). Furthermore, temperature-dependent line-width broadening in partially reduced samples established that the aromatic ring at position 43 participates in the control of the kinetics of intramolecular electron transfer. The rate of reduction of Y43L cytochrome c(3) by 5-deazariboflavin semiquinone under partially reduced conditions was significantly different from that of the wild type in the last stage of the reduction, supporting the involvement of Tyr43 in regulation of reduction kinetics. The mutation of Y43L, however, did not induce a significant change in the crystal structure.
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(as it appears on PubMed at http://www.pubmed.gov), where 14581238 is the PubMed ID number.
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{{ABSTRACT_PUBMED_14581238}}
==About this Structure==
==About this Structure==
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[[Category: High resolution x-ray structure]]
[[Category: High resolution x-ray structure]]
[[Category: Tetraheme cytochrome c3]]
[[Category: Tetraheme cytochrome c3]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 14:02:30 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 06:55:09 2008''

Revision as of 03:55, 29 July 2008

Image:1wr5.png

Template:STRUCTURE 1wr5

Three dimensional Structure of the E41K mutant of Tetraheme Cytochrome c3 from Desulfovibrio vulgaris Miyazaki F

Template:ABSTRACT PUBMED 14581238

About this Structure

1WR5 is a Single protein structure of sequence from Desulfovibrio vulgaris. Full crystallographic information is available from OCA.

Reference

Role of the aromatic ring of Tyr43 in tetraheme cytochrome c(3) from Desulfovibrio vulgaris Miyazaki F., Ozawa K, Takayama Y, Yasukawa F, Ohmura T, Cusanovich MA, Tomimoto Y, Ogata H, Higuchi Y, Akutsu H, Biophys J. 2003 Nov;85(5):3367-74. PMID:14581238

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