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2pfe

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{{STRUCTURE_2pfe| PDB=2pfe | SCENE= }}
{{STRUCTURE_2pfe| PDB=2pfe | SCENE= }}
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'''Crystal Structure of Thermobifida fusca Protease A (TFPA)'''
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===Crystal Structure of Thermobifida fusca Protease A (TFPA)===
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==Overview==
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Obtaining detailed knowledge of folding intermediate and transition state (TS) structures is critical for understanding protein folding mechanisms. Comparisons between proteins adapted to survive extreme temperatures with their mesophilic homologs are likely to provide valuable information on the interactions relevant to the unfolding transition. For kinetically stable proteins such as alpha-lytic protease (alphaLP) and its family members, their large free energy barrier to unfolding is central to their biological function. To gain new insights into the mechanisms that underlie kinetic stability, we have determined the structure and high temperature unfolding kinetics of a thermophilic homolog, Thermobifida fusca protease A (TFPA). These studies led to the identification of a specific structural element bridging the N and C-terminal domains of the protease (the "domain bridge") proposed to be associated with the enhanced high temperature kinetic stability in TFPA. Mutagenesis experiments exchanging the TFPA domain bridge into alphaLP validate this hypothesis and illustrate key structural details that contribute to TFPA's increased kinetic thermostability. These results lead to an updated model for the unfolding transition state structure for this important class of proteases in which domain bridge undocking and unfolding occurs at or before the TS. The domain bridge appears to be a structural element that can modulate the degree of kinetic stability of the different members of this class of proteases.
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(as it appears on PubMed at http://www.pubmed.gov), where 17543987 is the PubMed ID number.
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{{ABSTRACT_PUBMED_17543987}}
==About this Structure==
==About this Structure==
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[[Category: Thermophile]]
[[Category: Thermophile]]
[[Category: Thermostability]]
[[Category: Thermostability]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 13:00:07 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 20:11:22 2008''

Revision as of 17:11, 28 July 2008

Image:2pfe.png

Template:STRUCTURE 2pfe

Crystal Structure of Thermobifida fusca Protease A (TFPA)

Template:ABSTRACT PUBMED 17543987

About this Structure

2PFE is a Single protein structure of sequence from Thermobifida fusca. Full crystallographic information is available from OCA.

Reference

Mesophile versus thermophile: insights into the structural mechanisms of kinetic stability., Kelch BA, Agard DA, J Mol Biol. 2007 Jul 20;370(4):784-95. Epub 2007 May 10. PMID:17543987

Page seeded by OCA on Mon Jul 28 20:11:22 2008

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