8W0U

Human LCAD complexed with Acetoacetyl Coenzyme A

Summary for 8W0U

• Entry DOI: 10.2210/pdb8w0u/pdb
• Related: 8W0T
• Descriptor: Long-chain specific acyl-CoA dehydrogenase, mitochondrial, FLAVIN-ADENINE DINUCLEOTIDE, ACETOACETYL-COENZYME A, ... (4 entities in total)
• Functional Keywords: fatty acid beta-oxidation, lcad, flavoprotein, cholesterol metabolism
• Biological source: Homo sapiens (human)
• Total number of polymer chains: 4
• Total formula weight: 182824.40

Authors

Xia, C.,Kim, J.J.P. (deposition date: 2024-02-14, release date: 2024-06-19)

Primary citation

Narayanan, B.,Xia, C.,McAndrew, R.,Shen, A.L.,Kim, J.P.
Structural basis for expanded substrate specificities of human long chain acyl-CoA dehydrogenase and related acyl-CoA dehydrogenases.
Sci Rep, 14:12976-12976, 2024

PubMed Abstract: Crystal structures of human long-chain acyl-CoA dehydrogenase (LCAD) and the catalytically inactive Glu291Gln mutant, have been determined. These structures suggest that LCAD harbors functions beyond its historically defined role in mitochondrial β-oxidation of long and medium-chain fatty acids. LCAD is a homotetramer containing one FAD per 43 kDa subunit with Glu291 as the catalytic base. The substrate binding cavity of LCAD reveals key differences which makes it specific for longer and branched chain substrates. The presence of Pro132 near the start of the E helix leads to helix unwinding that, together with adjacent smaller residues, permits binding of bulky substrates such as 3α, 7α, l2α-trihydroxy-5β-cholestan-26-oyl-CoA. This structural element is also utilized by ACAD11, a eucaryotic ACAD of unknown function, as well as bacterial ACADs known to metabolize sterol substrates. Sequence comparison suggests that ACAD10, another ACAD of unknown function, may also share this substrate specificity. These results suggest that LCAD, ACAD10, ACAD11 constitute a distinct class of eucaryotic acyl CoA dehydrogenases.

PubMed: 38839792
DOI: 10.1038/s41598-024-63027-6

Experimental method

X-RAY DIFFRACTION (2.8 Å)