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1e2m

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{{STRUCTURE_1e2m| PDB=1e2m | SCENE= }}
{{STRUCTURE_1e2m| PDB=1e2m | SCENE= }}
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'''HPT + HMTT'''
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===HPT + HMTT===
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==Overview==
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The structure of Herpes simplex virus type 1 thymidine kinase (TK(HSV1)) is known at high resolution in complex with a series of ligands and exhibits important structural similarities to the nucleoside monophosphate (NMP) kinase family, which are known to show large conformational changes upon binding of substrates. The effect of substrate binding on the conformation and structural stability of TK(HSV1), measured by thermal denaturation experiments, far-UV circular dichroism (CD) and fluorescence is described, and the results indicate that the conformation of the ligand-free TK(HSV1) is less ordered and less stable compared to the ligated enzyme. Furthermore, two crystal structures of TK(HSV1) in complex with two new ligands, HPT and HMTT, refined to 2.2 A are presented. Although TK(HSV1):HPT does not exhibit any significant deviations from the model of TK(HSV1):dT, the TK(HSV1):HMTT complex displays a unique conformationally altered active site resulting in a lowered thermal stability of this complex. Moreover, we show that binding affinity and binding mode of the ligand correlate with thermal stability of the complex. We use this correlation to propose a method to estimate binding constants for new TK(HSV1)substrates using thermal denaturation measurements monitored by CD spectroscopy. The kinetic and structural results of both test substrates HPT and HMTT show that the CD thermal denaturation system is very sensitive to conformational changes caused by unusual binding of a substrate analog.
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{{ABSTRACT_PUBMED_11266595}}
==About this Structure==
==About this Structure==
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[[Category: Vogt, J.]]
[[Category: Vogt, J.]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 00:02:44 2008''

Revision as of 21:02, 30 June 2008

Image:1e2m.png

Template:STRUCTURE 1e2m

HPT + HMTT

Template:ABSTRACT PUBMED 11266595

About this Structure

1E2M is a Single protein structure of sequence from Human herpesvirus 1. Full crystallographic information is available from OCA.

Reference

The effect of substrate binding on the conformation and structural stability of Herpes simplex virus type 1 thymidine kinase., Wurth C, Kessler U, Vogt J, Schulz GE, Folkers G, Scapozza L, Protein Sci. 2001 Jan;10(1):63-73. PMID:11266595

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