1ioi

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[[Image:1ioi.gif|left|200px]]
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{{STRUCTURE_1ioi| PDB=1ioi | SCENE= }}
{{STRUCTURE_1ioi| PDB=1ioi | SCENE= }}
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'''x-ray crystalline structures of pyrrolidone carboxyl peptidase from a hyperthermophile, pyrococcus furiosus, and its cys-free mutant'''
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===x-ray crystalline structures of pyrrolidone carboxyl peptidase from a hyperthermophile, pyrococcus furiosus, and its cys-free mutant===
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==Overview==
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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.
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(as it appears on PubMed at http://www.pubmed.gov), where 11432786 is the PubMed ID number.
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{{ABSTRACT_PUBMED_11432786}}
==About this Structure==
==About this Structure==
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[[Category: Pyrococcus furiosus]]
[[Category: Pyrococcus furiosus]]
[[Category: Pyroglutamyl-peptidase i]]
[[Category: Pyroglutamyl-peptidase i]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 13:41:53 2008''

Revision as of 10:41, 1 July 2008

Image:1ioi.png

Template:STRUCTURE 1ioi

x-ray crystalline structures of pyrrolidone carboxyl peptidase from a hyperthermophile, pyrococcus furiosus, and its cys-free mutant

Template:ABSTRACT PUBMED 11432786

About this Structure

1IOI is a Single protein structure of sequence from Pyrococcus furiosus. Full crystallographic information is available from OCA.

Reference

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. 2001 Jul;130(1):107-18. PMID:11432786

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