A1 Journal article – refereed
A monomeric TIM-barrel structure from Pyrococcus furiosus is optimized for extreme temperatures




List of Authors: Repo H, Oeemig JS, Djupsjobacka J, Iwai H, Heikinheimo P
Publisher: WILEY-BLACKWELL
Publication year: 2012
Journal: Acta Crystallographica Section D: Biological Crystallography
Journal name in source: ACTA CRYSTALLOGRAPHICA SECTION D-BIOLOGICAL CRYSTALLOGRAPHY
Journal acronym: ACTA CRYSTALLOGR D
Volume number: 68
Number of pages: 9
ISSN: 0907-4449

Abstract
The structure of phosphoribosyl anthranilate isomerase (TrpF) from the hyperthermophilic archaeon Pyrococcus furiosus (PfTrpF) has been determined at 1.75 angstrom resolution. The PfTrpF structure has a monomeric TIM-barrel fold which differs from the dimeric structures of two other known thermophilic TrpF proteins. A comparison of the PfTrpF structure with the two known bacterial thermophilic TrpF structures and the structure of a related mesophilic protein from Escherichia coli (EcTrpF) is presented. The thermophilic TrpF structures contain a higher proportion of ion pairs and charged residues compared with the mesophilic EcTrpF. These residues contribute to the closure of the central barrel and the stabilization of the barrel and the surrounding alpha-helices. In the monomeric PfTrpF conserved structural water molecules are mostly absent; instead, the structural waters are replaced by direct side-chain-main-chain interactions. As a consequence of these combined mechanisms, the P. furiosus enzyme is a thermodynamically stable and entropically optimized monomeric TIM-barrel enzyme which defines a good framework for further protein engineering for industrial applications.


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Last updated on 2019-13-06 at 11:44