1m9x
From Proteopedia
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==Overview== | ==Overview== | ||
| - | Cyclophilins constitute a ubiquitous protein family whose functions | + | Cyclophilins constitute a ubiquitous protein family whose functions include protein folding, transport and signaling. They possess both sequence-specific binding and proline cis-trans isomerase activities, as exemplified by the interaction between cyclophilin A (CypA) and the HIV-1 CA protein. Here, we report crystal structures of CypA in complex with HIV-1 CA protein variants that bind preferentially with the substrate proline residue in either the cis or the trans conformation. Cis- and trans-Pro substrates are accommodated within the enzyme active site by rearrangement of their N-terminal residues and with minimal distortions in the path of the main chain. CypA Arg55 guanidinium group probably facilitates catalysis by anchoring the substrate proline oxygen and stabilizing sp3 hybridization of the proline nitrogen in the transition state. |
==About this Structure== | ==About this Structure== | ||
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[[Category: Peptidylprolyl isomerase]] | [[Category: Peptidylprolyl isomerase]] | ||
[[Category: Protein complex]] | [[Category: Protein complex]] | ||
| - | [[Category: Hill, C | + | [[Category: Hill, C P.]] |
| - | [[Category: Howard, B | + | [[Category: Howard, B R.]] |
[[Category: Li, S.]] | [[Category: Li, S.]] | ||
| - | [[Category: Sundquist, W | + | [[Category: Sundquist, W I.]] |
| - | [[Category: Vajdos, F | + | [[Category: Vajdos, F F.]] |
[[Category: capsid]] | [[Category: capsid]] | ||
[[Category: cyclophilin a]] | [[Category: cyclophilin a]] | ||
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[[Category: rotamase]] | [[Category: rotamase]] | ||
| - | ''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 13:53:02 2008'' |
Revision as of 11:53, 21 February 2008
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X-ray crystal structure of Cyclophilin A/HIV-1 CA N-terminal domain (1-146) M-type H87A,A88M,G89A Complex.
Overview
Cyclophilins constitute a ubiquitous protein family whose functions include protein folding, transport and signaling. They possess both sequence-specific binding and proline cis-trans isomerase activities, as exemplified by the interaction between cyclophilin A (CypA) and the HIV-1 CA protein. Here, we report crystal structures of CypA in complex with HIV-1 CA protein variants that bind preferentially with the substrate proline residue in either the cis or the trans conformation. Cis- and trans-Pro substrates are accommodated within the enzyme active site by rearrangement of their N-terminal residues and with minimal distortions in the path of the main chain. CypA Arg55 guanidinium group probably facilitates catalysis by anchoring the substrate proline oxygen and stabilizing sp3 hybridization of the proline nitrogen in the transition state.
About this Structure
1M9X is a Protein complex structure of sequences from Homo sapiens and Human immunodeficiency virus 1. Active as Peptidylprolyl isomerase, with EC number 5.2.1.8 Full crystallographic information is available from OCA.
Reference
Structural insights into the catalytic mechanism of cyclophilin A., Howard BR, Vajdos FF, Li S, Sundquist WI, Hill CP, Nat Struct Biol. 2003 Jun;10(6):475-81. PMID:12730686
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