BARC/PUB/2014/1654

 
 

Crystallization and preliminary X-ray crystallographic analysis of an artificial molten-globular-like triosephosphate isomerase protein of mixed phylogenetic origin

 
     
 
Author(s)

Goyal, V. D.; Yadav, P.; Kumar, A.; Ghosh, B.; Makde, R. D.
(HP&SRPD)

Source

Acta Crystallographica-F, 2014. Vol. 70: pp. 1521-1525

ABSTRACT

A bioinformatics-based protein-engineering approach called consensus design led to the construction of a chimeric triosephosphate isomerase (TIM) protein called ccTIM (curated consensus TIM) which is as active as Saccharomyces cerevisiae TIM despite sharing only 58% sequence identity with it. The aminoacid sequence of this novel protein is as identical to native sequences from eukaryotes as to those from prokaryotes and shares some biophysical traits with a molten globular protein. Solving its crystal structure would help in understanding the physical implications of its bioinformatics-based sequence. In this report, the ccTIM protein was successfully crystallized using the microbatch-under-oil method and a full X-ray diffraction data set was collected to 2.2 Å resolution using a synchrotron-radiation source. The crystals belonged to space group C2221, with unit-cell parameters a = 107.97, b= 187.21, c=288.22 Å. Matthews coefficient calculations indicated the presence of six dimmers in the asymmetric unit, with an approximate solvent content of 46.2%.

 
 
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