Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Predict Membrane 

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 69.90 kDa 
• Atom Count: 5186 
• Modelled Residue Count: 591 
• Deposited Residue Count: 616 
• Unique protein chains: 1

1NM8

Structure of Human Carnitine Acetyltransferase: Molecular Basis for Fatty Acyl Transfer

• PDB DOI: 10.2210/pdb1NM8/pdb

• Classification: TRANSFERASE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): Yes 
• Membrane Protein: Yes  OPM


• Deposited: 2003-01-09 Released: 2003-03-11 
• Deposition Author(s): Wu, D., Govindasamy, L., Lian, W., Gu, Y., Kukar, T., Agbandje-McKenna, M., McKenna, R.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.60 Å
• R-Value Free: 0.232 
• R-Value Work: 0.208 

Literature

Structure of Human Carnitine Acetyltransferase. Molecular Basis for Fatty Acyl Transfer

Wu, D., Govindasamy, L., Lian, W., Gu, Y., Kukar, T., Agbandje-McKenna, M., McKenna, R.

(2003) J Biol Chem 278: 13159-13165

• PubMed: 12562770 
• DOI: 10.1074/jbc.M212356200
• Primary Citation of Related Structures:  
  1NM8


• PubMed Abstract: 
  

Carnitine acyltransferases are a family of ubiquitous enzymes that play a pivotal role in cellular energy metabolism. We report here the x-ray structure of human carnitine acetyltransferase to a 1.6-A resolution. This structure reveals a monomeric protein of two equally sized alpha/beta domains. Each domain is shown to have a partially similar fold to other known but oligomeric enzymes that are also involved in group-transfer reactions. The unique monomeric arrangement of the two domains constitutes a central narrow active site tunnel, indicating a likely universal feature for all members of the carnitine acyltransferase family. Superimposition of the substrate complex of a related protein, dihydrolipoyl trans-acetylase, reveals that both substrates localize to the active site tunnel of human carnitine acetyltransferase, suggesting the location of the ligand binding sites for carnitine and coenzyme A. Most significantly, this structure provides critical insights into the molecular basis for fatty acyl chain transfer and a possible common mechanism among a wide range of acyltransferases utilizing a catalytic dyad.

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Organizational Affiliation: 

Department of Medicinal Chemistry, College of Pharmacy, University of Florida, Gainesville, Florida 32610, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Carnitine O-acetyltransferase	A	616	Homo sapiens	Mutation(s): 3  Gene Names: CRAT OR CAT1, CRAT, CAT1 EC: 2.3.1.7 (PDB Primary Data), 2.3.1.137 (UniProt) Membrane Entity: Yes
UniProt & NIH Common Fund Data Resources
Find proteins for P43155 (Homo sapiens) Explore P43155  Go to UniProtKB:  P43155
PHAROS:  P43155 GTEx:  ENSG00000095321

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.60 Å
• R-Value Free: 0.232 
• R-Value Work: 0.208 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 137.5	α = 90
b = 84.5	β = 90
c = 57.5	γ = 90

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
CNS	refinement
CNS	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2003-01-09 
• Released Date: 2003-03-11 
Deposition Author(s): Wu, D., Govindasamy, L., Lian, W., Gu, Y., Kukar, T., Agbandje-McKenna, M., McKenna, R.

Revision History  

• Version 1.0: 2003-03-11
  Type: Initial release
  
• Version 1.1: 2008-04-29
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance