2M76

Structure of the Regulatory Domain of Human Brain Carnitine Palmitoyltransferase 1


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 40 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural characterization of the regulatory domain of brain carnitine palmitoyltransferase 1.

Samanta, S.Situ, A.J.Ulmer, T.S.

(2014) Biopolymers 101: 398-405

  • DOI: 10.1002/bip.22396

  • PubMed Abstract: 
  • Neurons contain a mammalian-specific isoform of the enzyme carnitine palmitoyltransferase 1 (CPT1C) that couples malonyl-CoA to ceramide levels thereby contributing to systemic energy homeostasis and feeding behavior. In contrast to CPT1A, which cont ...

    Neurons contain a mammalian-specific isoform of the enzyme carnitine palmitoyltransferase 1 (CPT1C) that couples malonyl-CoA to ceramide levels thereby contributing to systemic energy homeostasis and feeding behavior. In contrast to CPT1A, which controls the rate-limiting step of long-chain fatty acid β-oxidation in all tissues, the biochemical context and regulatory mechanism of CPT1C are unknown. CPT1 enzymes are comprised of an N-terminal regulatory domain and a C-terminal catalytic domain (CD) that are separated by two transmembrane helices. In CPT1A, the regulatory domain, termed N, adopts an inhibitory and non-inhibitory state, Nα and Nβ, respectively, which differ in their association with the CD. To provide insight into the regulatory mechanism of CPT1C, we have determined the structure of its regulatory domain (residues Met1-Phe50) by NMR spectroscopy. In relation to CPT1A, the inhibitory Nα state was found to be structurally homologues whereas the non-inhibitory Nβ state was severely destabilized, suggesting a change in overall regulation. The destabilization of Nβ may contribute to the low catalytic activity of CPT1C relative to CPT1A and makes its association with the CD unlikely. In analogy to the stabilization of Nβ by the CPT1A CD, non-inhibitory interactions of N of CPT1C with another protein may exist.


    Organizational Affiliation

    Department of Biochemistry & Molecular Biology and Zilkha Neurogenetic Institute, Keck School of Medicine, University of Southern California, Los Angeles, CA, 90033.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Carnitine O-palmitoyltransferase 1, brain isoform
A
50Homo sapiensGene Names: CPT1C (CATL1)
EC: 2.3.1.21
Find proteins for Q8TCG5 (Homo sapiens)
Go to Gene View: CPT1C
Go to UniProtKB:  Q8TCG5
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 40 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-09-11
    Type: Initial release
  • Version 1.1: 2013-10-02
    Type: Database references
  • Version 1.2: 2014-02-05
    Type: Database references