2arl
From Proteopedia
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'''The 2.0 angstroms crystal structure of a pocilloporin at pH 3.5: the structural basis for the linkage between color transition and halide binding''' | '''The 2.0 angstroms crystal structure of a pocilloporin at pH 3.5: the structural basis for the linkage between color transition and halide binding''' | ||
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[[Category: Smith, S C.]] | [[Category: Smith, S C.]] | ||
[[Category: Wilmann, P G.]] | [[Category: Wilmann, P G.]] | ||
| - | [[Category: | + | [[Category: Chromophore]] |
| - | [[Category: | + | [[Category: Luminescence]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 19:23:30 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 16:23, 3 May 2008
The 2.0 angstroms crystal structure of a pocilloporin at pH 3.5: the structural basis for the linkage between color transition and halide binding
Overview
The pocilloporin Rtms5 and an engineered variant Rtms5H146S undergo distinct color transitions (from blue to red to yellow to colorless) in a pH-dependent manner. pK(a) values of 4.1 and 3.2 were determined for the blue (absorption lambda(max), 590 nm) to yellow (absorption lambda(max), approximately 453 nm) transitions of Rtms5 and Rtms5H146. The pK(a) for the blue-yellow transition of Rtms5H146S increased by 1.4 U in the presence of 0.1 M KI, whereas the pK(a) for the same transition of Rtms5 was relatively insensitive to added halides. To understand the structural basis for these observations, we have determined to 2.0 angstroms resolution the crystal structure of a yellow form of Rtms5H146S at pH 3.5 in the presence of iodide. Iodide was found occupying a pocket in the structure with a pH of 3.5, forming van der Waals contacts with the tyrosyl moiety of the chromophore. Elsewhere, it was determined that this pocket is occupied by a water molecule in the Rtms5H146S structure (pH 8.0) and by the side chain of histidine 146 in the wild-type Rtms5 structure. Collectively, our data provide an explanation for the observed linkage between color transitions for Rtms5H146S and binding to halides.
About this Structure
2ARL is a Single protein structure of sequence from Montipora efflorescens. Full crystallographic information is available from OCA.
Reference
The 2.0 angstroms crystal structure of a pocilloporin at pH 3.5: the structural basis for the linkage between color transition and halide binding., Wilmann PG, Battad J, Beddoe T, Olsen S, Smith SC, Dove S, Devenish RJ, Rossjohn J, Prescott M, Photochem Photobiol. 2006 Mar-Apr;82(2):359-66. PMID:16613486 Page seeded by OCA on Sat May 3 19:23:30 2008
