Fourier-transform infrared studies of CaATPase/phospholipid interaction: survey of lipid classes.

CaATPase from rabbit skeletal muscle has been isolated, purified, delipidated, and reconstituted with retention of ATPase activity into lipid vesicles consisting respectively of 1,2-dipalmitoylphosphatidylethanolamine, 1-palmitoyl-2-oleoylphosphatidylethanolamine (POPE), 1-stearoyl-2-oleoylphosphatidylcholine (SOPC), and egg sphingomyelin. The effect of the enzyme on phospholipid order and melting characteristics were determined with Fourier-transform infrared spectroscopy. Taken together with prior data from this laboratory for 1,2-dipalmitoylphosphatidylcholine and 1,2-dioleoylphosphatidylcholine (DOPC), as well as for native sarcoplasmic reticulum (SR), three types of lipid response to protein incorporation have been observed: (1) Phospholipids with high levels of acyl chain unsaturation (DOPC or native SR) have their lipid acyl chains slightly ordered by CaATPase incorporation. The effect of protein on the gel-liquid crystal phase transition cannot be easily determined, since the cooperative melting even in these systems occurs at temperature well below 0 degrees C. (2) Phospholipids with saturated acyl chains show slightly lowered melting temperatures and reduced cooperativity of melting upon CaATPase insertion. In addition, protein induces (at most) slight disorder into the acyl chains at temperatures removed from the lipid melting point. (3) The strongest response is observed for phospholipids containing one saturated and one unsaturated chain (POPE or SOPC) or heterogeneous systems with low levels of unsaturation (egg sphingomyelin). In these cases, relatively low protein levels diminish the magnitude of or completely abolish the phospholipid phase transition. In addition, substantial disorder is introduced into the acyl chain compared with the pure lipid both above and below its transition temperature.(ABSTRACT TRUNCATED AT 250 WORDS)

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