2pfe
From Proteopedia
(New page: 200px<br /><applet load="2pfe" size="350" color="white" frame="true" align="right" spinBox="true" caption="2pfe, resolution 1.436Å" /> '''Crystal Structure o...) |
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==Overview== | ==Overview== | ||
| - | Obtaining detailed knowledge of folding intermediate and transition state | + | 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. |
==About this Structure== | ==About this Structure== | ||
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==Reference== | ==Reference== | ||
| - | Mesophile versus | + | 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:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=17543987 17543987] |
[[Category: Single protein]] | [[Category: Single protein]] | ||
[[Category: Thermobifida fusca]] | [[Category: Thermobifida fusca]] | ||
| - | [[Category: Agard, D | + | [[Category: Agard, D A.]] |
| - | [[Category: Kelch, B | + | [[Category: Kelch, B A.]] |
[[Category: 2AB]] | [[Category: 2AB]] | ||
[[Category: GOL]] | [[Category: GOL]] | ||
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[[Category: beta-barrels; serine protease; thermophile; kinetic stability; thermostability; protein folding; alpha-lytic protease; folding transition state structure]] | [[Category: beta-barrels; serine protease; thermophile; kinetic stability; thermostability; protein folding; alpha-lytic protease; folding transition state structure]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 18:28:56 2008'' |
Revision as of 16:28, 21 February 2008
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Crystal Structure of Thermobifida fusca Protease A (TFPA)
Overview
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.
About this Structure
2PFE is a Single protein structure of sequence from Thermobifida fusca with , and as ligands. 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 Thu Feb 21 18:28:56 2008
