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J. Biol. Chem., Vol. 277, Issue 14, 12200-12207, April 5, 2002
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From the The acyl-CoA dehydrogenases are a family of
flavin adenine dinucleotide-containing enzymes that catalyze the first
step in the The atomic coordinates and the structure factors (code 1JQI) have been deposited in the Protein Data Bank, Research Collaboratory for Structural Bioinformatics, Rutgers University, New Brunswick, NJ (http://www.rcsb.org/).
Crystal Structure of Rat Short Chain Acyl-CoA Dehydrogenase
Complexed with Acetoacetyl-CoA
COMPARISON WITH OTHER ACYL-CoA DEHYDROGENASES*
§,
§,
,
,
¶,
, and
**
Department of Biochemistry, Medical College
of Wisconsin, Milwaukee, Wisconsin 53226 and
Departments of
Biochemistry and Molecular Biology and Medical Genetics, Mayo Clinic
and Foundation, Rochester, Minnesota 55905
-oxidation of fatty acids and catabolism of some amino
acids. They exhibit high sequence identity and yet are quite specific in their substrate binding. Short chain acyl-CoA dehydrogenase has
maximal activity toward butyryl-CoA and negligible activity toward
substrates longer than octanoyl-CoA. The crystal structure of rat short
chain acyl-CoA dehydrogenase complexed with the inhibitor acetoacetyl-CoA has been determined at 2.25 Å resolution. Short chain
acyl-CoA dehydrogenase is a homotetramer with a subunit mass of 43 kDa
and crystallizes in the space group P321 with a = 143.61 Å and
c = 77.46 Å. There are two monomers in the asymmetric unit. The
overall structure of short chain acyl-CoA dehydrogenase is very similar
to those of medium chain acyl-CoA dehydrogenase, isovaleryl-CoA
dehydrogenase, and bacterial short chain acyl-CoA dehydrogenase with a
three-domain structure composed of N- and C-terminal
-helical
domains separated by a
-sheet domain. Comparison to other acyl-CoA
dehydrogenases has provided additional insight into the basis of
substrate specificity and the nature of the oxidase activity in this
enzyme family. Ten reported pathogenic human mutations and two
polymorphisms have been mapped onto the structure of short chain
acyl-CoA dehydrogenase. None of the mutations directly affect the
binding cavity or intersubunit interactions.
*
This work was supported by Grants GM29076 (to J.-J. P .K.)
and DK54936 (to J. V.) from the National Institutes of Health.The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in
accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
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