Abstract
Binding affinity and binding-pocket polarity is determined for intracellular fatty acid- binding protein (FABP) from aerobic muscle of Chaenocephalus aceratus, the Antarctic icefish, and from rat heart. FABPs bind fatty acids via weak-bond forces (both ionic and hydrophobic), and these bond forces are temperature sensitive, yet FABPs are present in animals whose body temperatures range over nearly 40°C. To investigate FABPs sensitivity to body temperature, fatty acid binding affinity (Kd) was determined for both rat heart-FABP and icefish heart-FABP at two physiological temperatures (0°C or 37°C). Saturated and unsaturated fatty acids (16:0 and 16:1), delivered in model membranes (liposomes) whose composition is typical of either Antarctic fish (16:0/22:6 phosphatidylcholine) or mammals (bovine-heart phosphatidylcholine) were examined. Incubation at 0°C or 37°C does not significantly affect Kd for rat heart FABP, regardless of liposome composition or fatty acid ligand (Kd = 0.686 ± 0.127 – 1.129 ± 0.356 μM at 0°C, 0.775 ± 0.307 – 1.605 ± 0.427 gM at 37°C). Incubation temperature significantly affects icefish FABPs affinity for 16:1 (0.626 ± 0.093 μM at 37°C vs. 1.896 ± 0.343 μM at 0°C for fatty acid presented in Antarctic fish liposomes; 0.331 ± 0.101 μM at 37°C vs. 0.949 ± 0.121 μM at 0°C for bovine heart liposomes) but not 16:0. Kd is not significantly different between FABPs under any set of conditions (with one exception: Kd is significantly lower in rat FABP vs. icefish FABP for 16:0 at 0°C for fatty acids delivered in bovine heart liposomes). Although Kd values are largely equivalent between the two FABPs, relative contributions from ionic vs. hydrophobic weak-bond forces are different between the two animals. Rat heart FABP has a binding pocket that is significantly more nonpolar than that of icefish FABP (as measured by quantum yield of the bound fluorescent fatty-acid analogue (PA-DPH); Q = 0.067 ± 0.008 vs. 0.034 ± 0.005 at 0°C, 0.030 ± 0.003 vs. 0.019 ± 0.002 at 37°C). This suggests that rat-heart FABP realizes a micromolar Kd with a greater reliance upon hydrophobic interactions than does icefish FABP.
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Londraville, R.L., Storch, J. & Sidell, B.D. Binding site polarity and ligand affinity of homologous fatty acid-binding proteins from animals with different body temperatures. Mol Cell Biochem 159, 39–45 (1996). https://doi.org/10.1007/BF00226061
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DOI: https://doi.org/10.1007/BF00226061