A mitochondrial late embryogenesis abundant protein stabilizes model membranes in the dry state

Biochimica Et Biophysica Acta
Dimitri TolleterDavid Macherel

Abstract

Late embryogenesis abundant (LEA) proteins are a highly diverse group of polypeptides expected to play important roles in desiccation tolerance of plant seeds. They are also found in other plant tissues and in some anhydrobotic invertebrates, fungi, protists and prokaryotes. The LEA protein LEAM accumulates in the matrix space of pea (Pisum sativum) mitochondria during late seed maturation. LEAM is an intrinsically disordered protein folding into amphipathic alpha-helix upon desiccation. This suggests that it could interact with the inner mitochondrial membrane, providing structural protection in dry seeds. Here, we have used Fourier-transform infrared and fluorescence spectroscopy to gain insight into the molecular details of interactions of LEAM with phospholipid bilayers in the dry state and their effects on liposome stability. LEAM interacted specifically with negatively charged phosphate groups in dry phospholipids, increasing fatty acyl chain mobility. This led to an enhanced stability of liposomes during drying and rehydration, but also upon freezing. Protection depended on phospholipid composition and was strongly enhanced in membranes containing the mitochondrial phospholipid cardiolipin. Collectively, the results prov...Continue Reading

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