1XKT

Human fatty acid synthase: Structure and substrate selectivity of the thioesterase domain


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.258 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Human fatty acid synthase: structure and substrate selectivity of the thioesterase domain.

Chakravarty, B.Gu, Z.Chirala, S.S.Wakil, S.J.Quiocho, F.A.

(2004) Proc.Natl.Acad.Sci.Usa 101: 15567-15572

  • DOI: 10.1073/pnas.0406901101

  • PubMed Abstract: 
  • Human fatty acid synthase is a large homodimeric multifunctional enzyme that synthesizes palmitic acid. The unique carboxyl terminal thioesterase domain of fatty acid synthase hydrolyzes the growing fatty acid chain and plays a critical role in regul ...

    Human fatty acid synthase is a large homodimeric multifunctional enzyme that synthesizes palmitic acid. The unique carboxyl terminal thioesterase domain of fatty acid synthase hydrolyzes the growing fatty acid chain and plays a critical role in regulating the chain length of fatty acid released. Also, the up-regulation of human fatty acid synthase in a variety of cancer makes the thioesterase a candidate target for therapeutic treatment. The 2.6-A resolution structure of human fatty acid synthase thioesterase domain reported here is comprised of two dissimilar subdomains, A and B. The smaller subdomain B is composed entirely of alpha-helices arranged in an atypical fold, whereas the A subdomain is a variation of the alpha/beta hydrolase fold. The structure revealed the presence of a hydrophobic groove with a distal pocket at the interface of the two subdomains, which constitutes the candidate substrate binding site. The length and largely hydrophobic nature of the groove and pocket are consistent with the high selectivity of the thioesterase for palmitoyl acyl substrate. The structure also set the identity of the Asp residue of the catalytic triad of Ser, His, and Asp located in subdomain A at the proximal end of the groove.


    Organizational Affiliation

    Department of Biochemistry and Molecular Biology and Howard Hughes Medical Institute, Baylor College of Medicine, Houston, TX 77030, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
fatty acid synthase
A, B
289Homo sapiensMutation(s): 0 
Gene Names: FASN (FAS)
EC: 2.3.1.85
Find proteins for P49327 (Homo sapiens)
Go to Gene View: FASN
Go to UniProtKB:  P49327
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.258 
  • Space Group: P 41 2 2
Unit Cell:
Length (Å)Angle (°)
a = 104.783α = 90.00
b = 104.783β = 90.00
c = 126.460γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
CNSrefinement
SCALEPACKdata scaling
CNSphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-10-26
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance