7e5i
HUMAN PPAR ALPHA LIGAND BINDING DOMAIN IN COMPLEX WITH APHM6 OBTAINED BY SOAKING
Structural highlights
FunctionPPARA_HUMAN Ligand-activated transcription factor. Key regulator of lipid metabolism. Activated by the endogenous ligand 1-palmitoyl-2-oleoyl-sn-glycerol-3-phosphocholine (16:0/18:1-GPC). Activated by oleylethanolamide, a naturally occurring lipid that regulates satiety (By similarity). Receptor for peroxisome proliferators such as hypolipidemic drugs and fatty acids. Regulates the peroxisomal beta-oxidation pathway of fatty acids. Functions as transcription activator for the ACOX1 and P450 genes. Transactivation activity requires heterodimerization with RXRA and is antagonized by NR2C2.[1] [2] [3] [4] Publication Abstract from PubMedPeroxisome proliferator-activated receptor (PPAR)alpha, a member of the nuclear receptor family, is a transcription factor that regulates the expression of genes related to lipid metabolism in a ligand-dependent manner, and has attracted attention as a target for hypolipidemic drugs. We have been developing phenylpropaonic acid derivatives as PPARalpha-targeted drug candidates for the treatment of metabolic diseases. Recently, we have developed the "ligand-exchange soaking method," which crystallizes the recombinant PPARalpha ligand-binding domain (LBD) as a complex with intrinsic fatty acids derived from an expression host Escherichia (E.) coli and thereafter replaces them with other higher-affinity ligands by soaking. Here we applied this method for preparation of cocrystals of PPARalpha LBD with its ligands that have not been obtained with the conventional cocrystallization method. We revealed the high-resolution structures of the cocrystals of PPARalpha LBD and the three synthetic phenylpropaonic acid derivatives: TIPP-703, APHM19, and YN4pai, the latter two of which are the first observations. The overall structures of cocrystals obtained from the two methods are identical and illustrate the close interaction between these ligands and the surrounding amino acid residues of PPARalpha LBD. This ligand-exchange soaking method could be applicable to high throughput preparations of co-crystals with another subtype PPARdelta LBD for high resolution X-ray crystallography, because it also crystallizes in complex with intrinsic fatty acid(s) while not in the apo-form. Crystal Structures of the Human Peroxisome Proliferator-Activated Receptor (PPAR)alpha Ligand-Binding Domain in Complexes with a Series of Phenylpropanoic Acid Derivatives Generated by a Ligand-Exchange Soaking Method.,Oyama T, Kamata S, Ishii I, Miyachi H Biol Pharm Bull. 2021;44(9):1202-1209. doi: 10.1248/bpb.b21-00220. PMID:34471048[5] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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