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Structure of RPE65: P6522 crystal form grown in ammonium phosphate solutionStructure of RPE65: P6522 crystal form grown in ammonium phosphate solution
Structural highlights
Publication Abstract from PubMedRPE65 is a key metalloenzyme responsible for maintaining visual function in vertebrates. Despite extensive research on this membrane-bound retinoid isomerase, fundamental questions regarding its enzymology remain unanswered. Here, we report the crystal structure of RPE65 in a membrane-like environment. These crystals, obtained from enzymatically active, nondelipidated protein, displayed an unusual packing arrangement wherein RPE65 is embedded in a lipid-detergent sheet. Structural differences between delipidated and nondelipidated RPE65 uncovered key residues involved in substrate uptake and processing. Complementary iron K-edge X-ray absorption spectroscopy data established that RPE65 as isolated contained a divalent iron center and demonstrated the presence of a tightly bound ligand consistent with a coordinated carboxylate group. These results support the hypothesis that the Lewis acidity of iron could be used to promote ester dissociation and generation of a carbocation intermediate required for retinoid isomerization. Structure of RPE65 isomerase in a lipidic matrix reveals roles for phospholipids and iron in catalysis.,Kiser PD, Farquhar ER, Shi W, Sui X, Chance MR, Palczewski K Proc Natl Acad Sci U S A. 2012 Oct 9;109(41):E2747-56. doi:, 10.1073/pnas.1212025109. Epub 2012 Sep 24. PMID:23012475[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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