2bs7: Difference between revisions

Since the introduction of structural genomics, the protein has been, recognized as the most important variable in crystallization. Recent, strategies to modify a protein to improve crystal quality have included, rationally engineered point mutations, truncations, deletions and fusions., Five naturally occurring variants, differing in 1-18 amino acids, of the, 177-residue lectin domain of the F17G fimbrial adhesin were expressed and, purified in identical ways. For four out of the five variants crystals, were obtained, mostly in non-isomorphous space groups, with diffraction, limits ranging between 2.4 and 1.1 A resolution. A comparative analysis of, the crystal-packing contacts revealed that the variable amino acids are, often involved in lattice contacts and a single amino-acid substitution, can suffice to radically change crystal packing. A statistical approach, proved reliable to estimate the compatibilities of the variant sequences, with the observed crystal forms. In conclusion, natural variation, universally present within prokaryotic species, is a valuable genetic, resource that can be favourably employed to enhance the crystallization, success rate with considerably less effort than other strategies.

2BS7 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli] with CBS as [http://en.wikipedia.org/wiki/ligand ligand]. Structure known Active Site: AC1. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=2BS7 OCA].  

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