2g70

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{{STRUCTURE_2g70| PDB=2g70 | SCENE= }}
{{STRUCTURE_2g70| PDB=2g70 | SCENE= }}
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'''Structure of human PNMT in complex with inhibitor 3-hydroxymethyl-7-nitro-THIQ and AdoMet (SAM)'''
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===Structure of human PNMT in complex with inhibitor 3-hydroxymethyl-7-nitro-THIQ and AdoMet (SAM)===
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==Overview==
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Shape complementarity is a fundamental principle of inhibitor design. Here we show that an enzyme for which the crystal structure has been determined (phenylethanolamine N-methyltransferase, PNMT) conceals a cryptic binding site. This site is revealed upon binding of inhibitors that are double the size of the physiological substrate. These large inhibitors are not predicted to bind in that they protrude through the accessible surface calculated from a PNMT/7-aminosulfonyl-1,2,3,4-tetrahydroisoquinoline (SK&amp;F 29661) crystal structure, yet they are potent inhibitors of PNMT. We determined structures of the enzyme complexed with large inhibitors and found that the volume of the active site increases by 140 A3 upon binding. Changes in active site size and shape are brought about by unfavorable side chain conformations and rigid body helix motions. The energetic cost is modest, estimated at 2-3 kcal/mol from mutational analyses. Our findings further underline the importance of protein flexibility in structure-based inhibitor design studies.
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{{ABSTRACT_PUBMED_17845018}}
==About this Structure==
==About this Structure==
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[[Category: Tyndall, J D.A.]]
[[Category: Tyndall, J D.A.]]
[[Category: Methyltransferase]]
[[Category: Methyltransferase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 04:45:46 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 19:08:38 2008''

Revision as of 16:08, 27 July 2008

Image:2g70.png

Template:STRUCTURE 2g70

Structure of human PNMT in complex with inhibitor 3-hydroxymethyl-7-nitro-THIQ and AdoMet (SAM)

Template:ABSTRACT PUBMED 17845018

About this Structure

2G70 is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Enzyme adaptation to inhibitor binding: a cryptic binding site in phenylethanolamine N-methyltransferase., Gee CL, Drinkwater N, Tyndall JD, Grunewald GL, Wu Q, McLeish MJ, Martin JL, J Med Chem. 2007 Oct 4;50(20):4845-53. Epub 2007 Sep 11. PMID:17845018

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