2jmg: Difference between revisions

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[[Image:2jmg.jpg|left|200px]]
{{Seed}}
[[Image:2jmg.png|left|200px]]


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{{STRUCTURE_2jmg|  PDB=2jmg  |  SCENE=  }}  
{{STRUCTURE_2jmg|  PDB=2jmg  |  SCENE=  }}  


'''Solution structure of V7R mutant of HIV-1 myristoylated matrix protein'''
===Solution structure of V7R mutant of HIV-1 myristoylated matrix protein===




==Overview==
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During the late phase of human immunodeficiency virus type-1 (HIV-1) replication, newly synthesized retroviral Gag proteins are targeted to lipid raft regions of specific cellular membranes, where they assemble and bud to form new virus particles. Gag binds preferentially to the plasma membrane (PM) of most hematopoietic cell types, a process mediated by interactions between the cellular PM marker phosphatidylinositol-(4,5)-bisphosphate (PI(4,5)P(2)) and Gag's N-terminally myristoylated matrix (MA) domain. We recently demonstrated that PI(4,5)P(2) binds to a conserved cleft on MA and promotes myristate exposure, suggesting a role as both a direct membrane anchor and myristyl switch trigger. Here we show that PI(4,5)P(2) is also capable of binding to MA proteins containing point mutations that inhibit membrane binding in vitro, and in vivo, including V7R, L8A and L8I. However, these mutants do not exhibit PI(4,5)P(2) or concentration-dependent myristate exposure. NMR studies of V7R and L8A MA reveal minor structural changes that appear to be responsible for stabilizing the myristate-sequestered (myr(s)) species and inhibiting exposure. Unexpectedly, the myristyl group of a revertant mutant with normal PM targeting properties (V7R,L21K) is also tightly sequestered and insensitive to PI(4,5)P(2) binding. This mutant binds PI(4,5)P(2) with twofold higher affinity compared with the native protein, suggesting a potential compensatory mechanism for membrane binding.
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{{ABSTRACT_PUBMED_17188710}}


==About this Structure==
==About this Structure==
2JMG is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Human_immunodeficiency_virus_1 Human immunodeficiency virus 1]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2JMG OCA].  
2JMG is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Human_immunodeficiency_virus_1 Human immunodeficiency virus 1]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2JMG OCA].  


==Reference==
==Reference==
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[[Category: Tai, J.]]
[[Category: Tai, J.]]
[[Category: V7r mutant of hiv-1 myristoylated matrix protein]]
[[Category: V7r mutant of hiv-1 myristoylated matrix protein]]
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Revision as of 23:21, 27 July 2008

File:2jmg.png

Template:STRUCTURE 2jmg

Solution structure of V7R mutant of HIV-1 myristoylated matrix protein

Template:ABSTRACT PUBMED 17188710

About this Structure

2JMG is a Single protein structure of sequence from Human immunodeficiency virus 1. Full experimental information is available from OCA.

Reference

Point mutations in the HIV-1 matrix protein turn off the myristyl switch., Saad JS, Loeliger E, Luncsford P, Liriano M, Tai J, Kim A, Miller J, Joshi A, Freed EO, Summers MF, J Mol Biol. 2007 Feb 16;366(2):574-85. Epub 2006 Dec 1. PMID:17188710

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