1S5O image
Entry Detail
PDB ID:
1S5O
Keywords:
TRANSFERASE
Title:
Structural and Mutational Characterization of L-carnitine Binding to Human carnitine Acetyltransferase
Biological Source:
Source Organism:
Homo sapiens
Host Organism:
Escherichia coli
PDB Version:
Deposition Date:
2004-01-21
Release Date:
2004-02-03
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
1.80 Å
R-Value Work:
0.18
R-Value Observed:
0.18
Space Group:
P 21 21 21
1S5O validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Description:carnitine acetyltransferase isoform 2
Chain IDs:A
Chain Length:616
Number of Molecules:1
Biological Source:Homo sapiens
UniProt ID:P43155 Pfam ID:PF00755 EC:2.3.1.7
Ligand Molecules
152
Primary Citation
Structural and mutational characterization of l-carnitine binding to human carnitine acetyltransferase.
J.Struct.Biol. 146 416 424 (2004)
PMID: 15099582 DOI: 10.1016/j.jsb.2004.01.011

Abstact

We report the crystal structure of a binary complex of human peroxisomal carnitine acetyltransferase and the substrate l-carnitine, refined to a resolution of 1.8 Angstrom with an R(factor) value of 18.9% (R(free)=22.3%). L-carnitine binds to a preformed pocket in the active site tunnel of carnitine acetyltransferase aligned with His(322). The quaternary nitrogen of carnitine forms a pi-cation interaction with Phe(545), while Arg(497) forms an electrostatic interaction with the negatively charged carboxylate group. An extensive hydrogen bond network also occurs between the carboxylate group and Tyr(431), Thr(444), and a bound water molecule. Site-directed mutagenesis and kinetic characterization reveals that Tyr(431), Thr(444), Arg(497), and Phe(545) are essential for high affinity binding of L-carnitine.

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Primary Citation of related structures
1S5O