1s64

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[[Image:1s64.gif|left|200px]]
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{{STRUCTURE_1s64| PDB=1s64 | SCENE= }}
{{STRUCTURE_1s64| PDB=1s64 | SCENE= }}
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'''Rat protein geranylgeranyltransferase type-I complexed with L-778,123 and a sulfate anion'''
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===Rat protein geranylgeranyltransferase type-I complexed with L-778,123 and a sulfate anion===
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==Overview==
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Many signal transduction proteins that control growth, differentiation, and transformation, including Ras GTPase family members, require the covalent attachment of a lipid group by protein farnesyltransferase (FTase) or protein geranylgeranyltransferase type-I (GGTase-I) for proper function and for the transforming activity of oncogenic mutants. FTase inhibitors are a new class of potential cancer therapeutics under evaluation in human clinical trials. Here, we present crystal structures of the clinical candidate L-778,123 complexed with mammalian FTase and complexed with the related GGTase-I enzyme. Although FTase and GGTase-I have very similar active sites, L-778,123 adopts different binding modes in the two enzymes; in FTase, L-778,123 is competitive with the protein substrate, whereas in GGTase-I, L-778,123 is competitive with the lipid substrate and inhibitor binding is synergized by tetrahedral anions. A comparison of these complexes reveals that small differences in protein structure can dramatically affect inhibitor binding and selectivity. These structures should facilitate the design of more specific inhibitors toward FTase or GGTase-I. Finally, the binding of a drug and anion together could be applicable for developing new classes of inhibitors.
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(as it appears on PubMed at http://www.pubmed.gov), where 15248757 is the PubMed ID number.
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{{ABSTRACT_PUBMED_15248757}}
==About this Structure==
==About this Structure==
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[[Category: Protein geranylgeranyltransferase type-i]]
[[Category: Protein geranylgeranyltransferase type-i]]
[[Category: Protein prenylation]]
[[Category: Protein prenylation]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 08:20:57 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 05:43:48 2008''

Revision as of 02:43, 29 July 2008

Image:1s64.png

Template:STRUCTURE 1s64

Rat protein geranylgeranyltransferase type-I complexed with L-778,123 and a sulfate anion

Template:ABSTRACT PUBMED 15248757

About this Structure

1S64 is a Protein complex structure of sequences from Rattus norvegicus. Full crystallographic information is available from OCA.

Reference

Crystallographic analysis reveals that anticancer clinical candidate L-778,123 inhibits protein farnesyltransferase and geranylgeranyltransferase-I by different binding modes., Reid TS, Long SB, Beese LS, Biochemistry. 2004 Jul 20;43(28):9000-8. PMID:15248757

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