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Structural basis for the ligand-binding specificity of fatty acid-binding proteins (pFABP4 and pFABP5) in gentoo penguin

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Title
Structural basis for the ligand-binding specificity of fatty acid-binding proteins (pFABP4 and pFABP5) in gentoo penguin
Authors
Lee, Chang Woo
Kim, Jung Eun
Do, Hackwon
Kim, Ryeo-Ok
Lee, Sung Gu
Park, Hyun Ho
Chang, Jeong Ho
Yim, Joung Han
Park, Hyun
Kim, Il-Chan
Lee, Jun Hyuck
Subject
Biochemistry & Molecular Biology; Biophysics
Keywords
Fatty acid-binding protein; β-barrel protein; Crystal structure; Gentoo penguin(Pygoscelis papua); X-ray crystallography
Issue Date
2015
Citation
Lee, Chang Woo., et al. 2015. Structural basis for the ligand-binding specificity of fatty acid-binding proteins (pFABP4 and pFABP5) in gentoo penguin. Biochemical and Biophysical Research Communications, 465: 12-18.
Abstract
Fatty acid-binding proteins (FABPs) are involved in transporting hydrophobic fatty acids between various aqueous compartments of the cell by directly binding ligands inside their β-barrel cavities. Here, we report the crystal structures of ligand-unbound pFABP4, linoleate-bound pFABP4, and palmitate-bound pFABP5, obtained from gentoo penguin (Pygoscelis papua), at a resolution of 2.1?, 2.2?, and 2.3?,respectively. The pFABP4 and pFABP5 proteins have a canonical b-barrel structure with two short ahelices that form a cap region and fatty acid ligand binding sites in the hydrophobic cavity within the bbarrel structure. Linoleate-bound pFABP4 and palmitate-bound pFABP5 possess different ligand-binding modes and a unique ligand-binding pocket due to several sequence dissimilarities (A76/L78, T30/M32, underlining indicates pFABP4 residues) between the two proteins. Structural comparison revealed significantly different conformational changes in the β3-β4 loop region (residues 57-62) as well as the flipped Phe60 residue of pFABP5 than that in pFABP4 (the corresponding residue is Phe58). A ligandbinding study using fluorophore displacement assays shows that pFABP4 has a relatively strong affinity for linoleate as compared to pFABP5. In contrast, pFABP5 exhibits higher affinity for palmitate than that for pFABP4. In conclusion, our high-resolution structures and ligand-binding studies provide useful insights into the ligand-binding preferences of pFABPs based on key proteineligand interactions.
DOI
10.1016/j.bbrc.2015.07.087
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