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2ptj

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[[Image:2ptj.gif|left|200px]]
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[[Image:2ptj.png|left|200px]]
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{{STRUCTURE_2ptj| PDB=2ptj | SCENE= }}
{{STRUCTURE_2ptj| PDB=2ptj | SCENE= }}
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'''Crystal Structure of F169R p38 Kinase'''
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===Crystal Structure of F169R p38 Kinase===
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==Overview==
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In order to study the role of Phe169 in p38alpha MAP kinase structure and function, wild-type p38alpha and five p38alpha DFG motif mutants were examined in vitro for phosphorylation by MKK6, kinase activity toward ATF2 substrate, thermal stability, and X-ray crystal structure. All six p38alpha variants were efficiently phosphorylated by MKK6. However, only one activated p38alpha mutant (F169Y) possessed measurable kinase activity (1% compared to wild-type). The loss of kinase activity among the DFG mutants may result from an inability to correctly position Asp168 in the activated form of p38alpha. Two mutations significantly increased the thermal stability of p38alpha (F169A DeltaTm = 1.3 degrees C and D168G DeltaTm = 3.8 degrees C), and two mutations significantly decreased the stability of p38alpha (F169R DeltaTm = -3.2 degrees C and F169G DeltaTm = -4.7 degrees C). Interestingly, X-ray crystal structures of two thermally destabilized p38alpha-F169R and p38alpha-F169G mutants revealed a DFG-OUT conformation in the absence of an inhibitor molecule. This DFG-OUT conformation, termed alpha-DFG-OUT, is different from the ones previously identified in p38alpha crystal structures with bound inhibitors and postulated from high-temperature molecular dynamics simulations. Taken together, these results indicate that Phe169 is optimized for p38alpha functional activity and structural dynamics, rather than for structural stability. The alpha-DFG-OUT conformation observed for p38alpha-F169R and p38alpha-F169G may represent a naturally occurring intermediate state of p38alpha that provides access for binding of allosteric inhibitors. A model of the local forces driving the DFG IN-OUT transition in p38alpha is proposed.
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(as it appears on PubMed at http://www.pubmed.gov), where 17441692 is the PubMed ID number.
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{{ABSTRACT_PUBMED_17441692}}
==About this Structure==
==About this Structure==
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[[Category: Springman, E B.]]
[[Category: Springman, E B.]]
[[Category: Protein kinase]]
[[Category: Protein kinase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 13:46:51 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 18:30:45 2008''

Revision as of 15:30, 27 July 2008

Image:2ptj.png

Template:STRUCTURE 2ptj

Crystal Structure of F169R p38 Kinase

Template:ABSTRACT PUBMED 17441692

About this Structure

2PTJ is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Mutagenesis of p38alpha MAP kinase establishes key roles of Phe169 in function and structural dynamics and reveals a novel DFG-OUT state., Bukhtiyarova M, Karpusas M, Northrop K, Namboodiri HV, Springman EB, Biochemistry. 2007 May 15;46(19):5687-96. Epub 2007 Apr 19. PMID:17441692

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