Studies on chloroplast membranes. IV. ¹³C chemical shifts and longitudinal relaxation times of 3-sn-phosphatidylglycerol

Abstract

¹³C chemical shifts, longitudinal relaxation times and some nuclear Overhauser enhancement factors of individual carbon atoms in the chloroplast lipid, 3-sn-phosphatidylglycerol (pg), have been measured in (D₄)methanol and (D)chloroform. Correlation times for individual carbon atoms calculated from these results have been interpreted in terms of different secondary structures: a monomeric structure in (D₄)methanol and an inverted micelle in (D)chloroform. Differences in structures between the four major lipid components of the chloroplast membrane are briefly discussed.