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1h92

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[[Image:1h92.gif|left|200px]]
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{{STRUCTURE_1h92| PDB=1h92 | SCENE= }}
{{STRUCTURE_1h92| PDB=1h92 | SCENE= }}
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'''SH3 DOMAIN OF HUMAN LCK TYROSINE KINASE'''
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===SH3 DOMAIN OF HUMAN LCK TYROSINE KINASE===
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==Overview==
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Herpesvirus saimiri codes for a tyrosine kinase interacting protein (Tip) that interacts with both the SH3 domain and the kinase domain of the T-cell-specific tyrosine kinase Lck via two separate motifs. The activation of Lck by Tip is considered as a key event in the transformation of human T-lymphocytes during herpesviral infection. We investigated the interaction of proline-rich Tip peptides with the LckSH3 domain starting with the structural characterization of the unbound interaction partners. The solution structure of the LckSH3 was determined by heteronuclear multidimensional nuclear magnetic resonance (NMR) spectroscopy using 44 residual dipolar couplings in addition to the conventional experimental restraints. Circular dichroism spectroscopy proved that the polyproline helix of Tip is already formed prior to SH3 binding and is conformationally stable. NMR titration experiments point out three major regions of the Tip-Lck interaction comprising the RT loop, the n-src loop, and a helical turn preceding the last strand of the beta-sheet. Further changes of the chemical shifts were observed for the N- and C-terminal beta-strands of the SH3 domain, indicating additional contacts outside the proline-rich segment or subtle structural rearrangements transmitted from the binding site of the proline helix. Fluorescence spectroscopy shows that Tip binds to the SH3 domains of several Src kinases (Lck, Hck, Lyn, Src, Fyn, Yes), exhibiting the highest affinities for Lyn, Hck, and Lck.
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{{ABSTRACT_PUBMED_11955060}}
==About this Structure==
==About this Structure==
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1H92 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1H92 OCA].
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1H92 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1H92 OCA].
==Reference==
==Reference==
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[[Category: Signal transduction]]
[[Category: Signal transduction]]
[[Category: Tyrosine kinase]]
[[Category: Tyrosine kinase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 06:53:28 2008''

Revision as of 03:53, 1 July 2008

Image:1h92.png

Template:STRUCTURE 1h92

SH3 DOMAIN OF HUMAN LCK TYROSINE KINASE

Template:ABSTRACT PUBMED 11955060

About this Structure

1H92 is a Single protein structure of sequence from Homo sapiens. Full experimental information is available from OCA.

Reference

Structural investigation of the binding of a herpesviral protein to the SH3 domain of tyrosine kinase Lck., Schweimer K, Hoffmann S, Bauer F, Friedrich U, Kardinal C, Feller SM, Biesinger B, Sticht H, Biochemistry. 2002 Apr 23;41(16):5120-30. PMID:11955060

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