1KZP image
Entry Detail
PDB ID:
1KZP
Title:
PROTEIN FARNESYLTRANSFERASE COMPLEXED WITH A FARNESYLATED K-RAS4B PEPTIDE PRODUCT
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2002-02-07
Release Date:
2002-10-16
Method Details:
Experimental Method:
Resolution:
2.10 Å
R-Value Free:
0.20
R-Value Work:
0.16
R-Value Observed:
0.16
Space Group:
P 61
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Protein Farnesyltransferase alpha subunit
Chain IDs:A
Chain Length:377
Number of Molecules:1
Biological Source:Rattus norvegicus
Polymer Type:polypeptide(L)
Description:Protein Farnesyltransferase beta subunit
Chain IDs:B
Chain Length:437
Number of Molecules:1
Biological Source:Rattus norvegicus
Polymer Type:polypeptide(L)
Description:Farnesylated K-Ras4B peptide product
Chain IDs:C
Chain Length:11
Number of Molecules:1
Biological Source:
Primary Citation
Reaction path of protein farnesyltransferase at atomic resolution
Nature 419 645 650 (2002)
PMID: 12374986 DOI: 10.1038/nature00986

Abstact

Protein farnesyltransferase (FTase) catalyses the attachment of a farnesyl lipid group to numerous essential signal transduction proteins, including members of the Ras superfamily. The farnesylation of Ras oncoproteins, which are associated with 30% of human cancers, is essential for their transforming activity. FTase inhibitors are currently in clinical trials for the treatment of cancer. Here we present a complete series of structures representing the major steps along the reaction coordinate of this enzyme. From these observations can be deduced the determinants of substrate specificity and an unusual mechanism in which product release requires binding of substrate, analogous to classically processive enzymes. A structural model for the transition state consistent with previous mechanistic studies was also constructed. The processive nature of the reaction suggests the structural basis for the successive addition of two prenyl groups to Rab proteins by the homologous enzyme geranylgeranyltransferase type-II. Finally, known FTase inhibitors seem to differ in their mechanism of inhibiting the enzyme.

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Primary Citation of related structures