1iof
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X-RAY CRYSTALLINE STRUCTURES OF PYRROLIDONE CARBOXYL PEPTIDASE FROM A HYPERTHERMOPHILE, PYROCOCCUS FURIOSUS, AND ITS CYS-FREE MUTANT
OverviewOverview
In order to elucidate the mechanism of the thermostability of proteins, from hyperthermophiles, X-ray crystalline structures of pyrrolidone, carboxyl peptidase from a hyperthermophile, Pyrococcus furiosus (PfPCP), and its mutant protein with Ser substituted at Cys142 and Cys188 were, determined at 2.2 and 2.7 A resolution, respectively. The obtained, structures were compared with those previously reported for pyrrolidone, carboxyl peptidases from a hyperthermophilie, Thermococcus litoralis, (TlPCP), and from a mesophile, Bacillus amyloliquefaciens (BaPCP). The, PfPCP structure is a tetramer of four identical subunits similar to that, of the TlPCP and BaPCP. The largest structural changes among the three, PCPs were detected in the C-terminal protrusion, which interacts with that, of another subunit. A comparison of the three structures indicated that, the high stability of PfPCP is caused by increases in hydrophobic, interactions and hydrogen bonds, the formation of an intersubunit ion-pair, network, and improvement to an ideal conformation. On the basis of the, structures of the three proteins, it can be concluded that PfPCP does not, have any special factors responsible for its extremely high stability and, that the conformational structure of PfPCP is superior in its combination, of positive and negative stabilizing factors compared with BaPCP.
About this StructureAbout this Structure
1IOF is a Single protein structure of sequence from Pyrococcus furiosus. Active as Pyroglutamyl-peptidase I, with EC number 3.4.19.3 Full crystallographic information is available from OCA.
ReferenceReference
X-ray crystalline structures of pyrrolidone carboxyl peptidase from a hyperthermophile, Pyrococcus furiosus, and its cys-free mutant., Tanaka H, Chinami M, Mizushima T, Ogasahara K, Ota M, Tsukihara T, Yutani K, J Biochem (Tokyo). 2001 Jul;130(1):107-18. PMID:11432786
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