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Crystallization of sparingly soluble stress-related proteins from cyanobacteria by controlled urea solublization.

Abstract：

:The phycobilisome photosynthetic antenna complex, found in cyanobacteria and red-algae, interacts with proteins expressed specifically to deal with different forms of physiological stress. Under conditions of nutrient starvation, the NblA protein is required for the process that leads to phycobilisome degradation and bleaching of the cells. HspA, a 16.5 kDa heat shock protein expressed in cyanobacterial cells, has been shown to provide functional stability to the phycobilisome during heat stress. We have cloned the genes encoding for these proteins into bacterial expression vectors in order to determine their three-dimensional structures. The resulting recombinant proteins were found to be sparingly soluble, limiting their usefulness in the performance of crystallization experiments. We have developed a novel protocol that utilizes relatively high concentrations of urea to afford sufficient solubility to the protein. This has lead to the successful growth of diffraction quality crystals of these proteins. Complete data sets collected to 2-2.5A from crystals of both proteins shows that the crystals are stable, and useful for structure determination. A preliminary structure of the NblA shows that denaturation has not occurred and specific protein-protein interactions have been preserved. We believe that this protocol may be a generally advantageous method to obtain well diffracting crystals of sparingly soluble proteins.

journal_name

J Struct Biol

journal_title

Journal of structural biology

authors

Dines M,Sendersky E,Schwarz R,Adir N

doi

10.1016/j.jsb.2006.10.021

subject

Has Abstract

pub_date

2007-04-01 00:00:00

pages

116-21

issue

1

eissn

1047-8477

issn

1095-8657

pii

S1047-8477(06)00328-5

journal_volume

158

pub_type

杂志文章

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