1JCS

CRYSTAL STRUCTURE OF RAT PROTEIN FARNESYLTRANSFERASE COMPLEXED WITH THE PEPTIDE SUBSTRATE TKCVFM AND AN ANALOG OF FARNESYL DIPHOSPHATE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.202 
  • R-Value Work: 0.160 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The crystal structure of human protein farnesyltransferase reveals the basis for inhibition by CaaX tetrapeptides and their mimetics.

Long, S.B.Hancock, P.J.Kral, A.M.Hellinga, H.W.Beese, L.S.

(2001) Proc.Natl.Acad.Sci.USA 98: 12948-12953

  • DOI: 10.1073/pnas.241407898
  • Primary Citation of Related Structures:  1JCQ, 1JCR

  • PubMed Abstract: 
  • Protein farnesyltransferase (FTase) catalyzes the attachment of a farnesyl lipid group to the cysteine residue located in the C-terminal tetrapeptide of many essential signal transduction proteins, including members of the Ras superfamily. Farnesylat ...

    Protein farnesyltransferase (FTase) catalyzes the attachment of a farnesyl lipid group to the cysteine residue located in the C-terminal tetrapeptide of many essential signal transduction proteins, including members of the Ras superfamily. Farnesylation is essential both for normal functioning of these proteins, and for the transforming activity of oncogenic mutants. Consequently FTase is an important target for anti-cancer therapeutics. Several FTase inhibitors are currently undergoing clinical trials for cancer treatment. Here, we present the crystal structure of human FTase, as well as ternary complexes with the TKCVFM hexapeptide substrate, CVFM non-substrate tetrapeptide, and L-739,750 peptidomimetic with either farnesyl diphosphate (FPP), or a nonreactive analogue. These structures reveal the structural mechanism of FTase inhibition. Some CaaX tetrapeptide inhibitors are not farnesylated, and are more effective inhibitors than farnesylated CaaX tetrapeptides. CVFM and L-739,750 are not farnesylated, because these inhibitors bind in a conformation that is distinct from the TKCVFM hexapeptide substrate. This non-substrate binding mode is stabilized by an ion pair between the peptide N terminus and the alpha-phosphate of the FPP substrate. Conformational mapping calculations reveal the basis for the sequence specificity in the third position of the CaaX motif that determines whether a tetrapeptide is a substrate or non-substrate. The presence of beta-branched amino acids in this position prevents formation of the non-substrate conformation; all other aliphatic amino acids in this position are predicted to form the non-substrate conformation, provided their N terminus is available to bind to the FPP alpha-phosphate. These results may facilitate further development of FTase inhibitors.


    Related Citations: 
    • Crystal Structure of Protein Farnesyltransferase at 2.25A Resolution
      Park, H.-W.,Boduluri, S.R.,Moomaw, J.F.,Casey, P.J.,Beese, L.S.
      (1997) Science 275: 1800
    • The Basis for K-Ras4B Binding Specificity to Protein Farnesyltransferase Revealed by 2A Resolution Ternary Complex Structures
      Long, S.B.,Casey, P.J.,Beese, L.S.
      (2000) Structure 8: 209


    Organizational Affiliation

    Department of Biochemistry, Duke University Medical Center, Durham, NC 27710, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEIN FARNESYLTRANSFERASE, ALPHA SUBUNIT
A
377Rattus norvegicusGene Names: Fnta
EC: 2.5.1.58, 2.5.1.59
Find proteins for Q04631 (Rattus norvegicus)
Go to UniProtKB:  Q04631
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
PROTEIN FARNESYLTRANSFERASE, BETA SUBUNIT
B
437Rattus norvegicusGene Names: Fntb
EC: 2.5.1.58
Find proteins for Q02293 (Rattus norvegicus)
Go to UniProtKB:  Q02293
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
SYNTHETIC HEXAPEPTIDE TKCVFM
C
6N/AN/A
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
B
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
ACY
Query on ACY

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Download CCD File 
B
ACETIC ACID
C2 H4 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-N
 Ligand Interaction
FII
Query on FII

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Download CCD File 
B
[(3,7,11-TRIMETHYL-DODECA-2,6,10-TRIENYLOXYCARBAMOYL)-METHYL]-PHOSPHONIC ACID
FPP ANALOG
C17 H30 N O5 P
JAOBYUCYSAOLHS-XGGJEREUSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.202 
  • R-Value Work: 0.160 
  • Space Group: P 61
Unit Cell:
Length (Å)Angle (°)
a = 170.921α = 90.00
b = 170.921β = 90.00
c = 69.425γ = 120.00
Software Package:
Software NamePurpose
X-PLORrefinement
SCALEPACKdata scaling
X-PLORmodel building
DENZOdata reduction
X-PLORphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-11-02
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Atomic model, Database references, Derived calculations, Non-polymer description, Structure summary, Version format compliance