Abstract
ABSTRACTLecithin:cholesterol acyltransferase (LCAT) and LCAT-activating small molecules are being investigated as treatments for coronary heart disease (CHD) and familial LCAT deficiency (FLD). Herein we report the crystal structure of LCAT bound to a potent activator and an acyl intermediate-like inhibitor, thereby revealing an active conformation of LCAT and that the activator is bound exclusively to its membrane-binding domain (MBD). Functional studies indicate that the compound does not modulate the affinity of LCAT for HDL, but instead stabilizes residues in the MBD and likely facilitates channeling of substrates into the active site. By demonstrating that these activators increase the activity of an FLD variant, we show that compounds targeting the MBD have therapeutic potential. In addition, our data better define the acyl binding site of LCAT and pave the way for rational design of LCAT agonists and improved biotherapeutics for augmenting or restoring reverse cholesterol transport in CHD and FLD patients.
Publisher
Cold Spring Harbor Laboratory
Reference50 articles.
1. MedImmune. A Study to Evaluate the Safety and Efficacy of MEDI6012 in Acute ST Elevation Myocardial Infarction (REAL-TIMI 63B). Available from: https://clinicaltrials.gov/ct2/show/NCT03578809. NLM identifier: NCT03578809.
2. MedImmune. To Evaluate Safety, Pharmacokinetics and Pharmacodynamics of MEDI6012 in Subjects With Stable Coronary Artery Disease. Available from: https://clinicaltrials.gov/ct2/show/NCT02601560. NLM identifier: NCT02601560.
3. PHENIX: a comprehensive Python-based system for macromolecular structure solution
4. Ahsan, L. , Ossoli, A.F. , Freeman, L. , Vaisman, B. , Amar, M.J. , Shamburek, R.D. , and Remaley, A.T. (2014). Role of Lecithin: Cholesterol Acytransferase in HDL Metabolism and Atherosclerosis. In The HDL Handbook: Biological Functions and Clinical Implications., T. Komoda , ed. (Elsevier), pp. 159–194. ISBN: 978-0-12-407867-3
5. Genetic lecithin:cholesterol acyltransferase deficiency and cardiovascular disease