Download MendeleyThe Crystal Structure of Liganded Rat Peroxisomal Multifunctional Enzyme Type 1: A Flexible Molecule with Two Interconnected Active Sites
Kasaragod, P., Venkatesan, R., Kiema, T.R., Hiltunen, J.K., Wierenga, R.K.(2010) J Biological Chem 285: 24089
- PubMed: 20463028 Search on PubMedSearch on PubMed Central
- DOI: https://doi.org/10.1074/jbc.M110.117606
- Primary Citation Related Structures:
2X58 - PubMed Abstract:
The crystal structure of the full-length rat peroxisomal multifunctional enzyme, type 1 (rpMFE1), has been determined at 2.8 A resolution. This enzyme has three catalytic activities and two active sites. The N-terminal part has the crotonase fold, which builds the active site for the Delta(3),Delta(2)-enoyl-CoA isomerase and the Delta(2)-enoyl-CoA hydratase-1 catalytic activities, and the C-terminal part has the (3S)-hydroxyacyl-CoA dehydrogenase fold and makes the (3S)-hydroxyacyl-CoA dehydrogenase active site. rpMFE1 is a multidomain protein having five domains (A-E). The crystal structure of full-length rpMFE1 shows a flexible arrangement of the A-domain with respect to the B-E-domains. Because of a hinge region near the end of the A-domain, two different positions of the A-domain were observed for the two protein molecules (A and B) of the asymmetric unit. In the most closed conformation, the mode of binding of CoA is stabilized by domains A and B (helix-10), as seen in other crotonase fold members. Domain B, although functionally belonging to the N-terminal part, is found tightly associated with the C-terminal part, i.e. fixed to the E-domain. The two active sites of rpMFE1 are approximately 40 A apart, separated by a tunnel, characterized by an excess of positively charged side chains. Comparison of the structures of rpMFE1 with the monofunctional crotonase and (3S)-hydroxyacyl-CoA dehydrogenase superfamily enzymes, as well as with the bacterial alpha(2)beta(2)-fatty acid oxidation multienzyme complex, reveals that this tunnel could be important for substrate channeling, as observed earlier on the basis of the kinetics of rpMFE1 purified from rat liver.
- Biocenter Oulu and Department of Biochemistry, University of Oulu, FI-90014 Oulu, Finland.
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