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. 1999 Oct;77(4):2024–2034. doi: 10.1016/S0006-3495(99)77043-8

Lipid composition determines the effects of arbutin on the stability of membranes.

D K Hincha 1, A E Oliver 1, J H Crowe 1
PMCID: PMC1300483  PMID: 10512822

Abstract

Arbutin (hydroquinone-beta-D-glucopyranoside) is an abundant solute in the leaves of many freezing- or desiccation-tolerant plants. Its physiological role in plants, however, is not known. Here we show that arbutin protects isolated spinach (Spinacia oleracea L.) thylakoid membranes from freeze-thaw damage. During freezing of liposomes, the presence of only 20 mM arbutin led to complete leakage of a soluble marker from egg PC (EPC) liposomes. When the nonbilayer-forming chloroplast lipid monogalactosyldiacylglycerol (MGDG) was included in the membranes, this leakage was prevented. Inclusion of more than 15% MGDG into the membranes led to a strong destabilization of liposomes during freezing. Under these conditions arbutin became a cryoprotectant, as only 5 mM arbutin reduced leakage from 75% to 20%. The nonbilayer lipid egg phosphatidylethanolamine (EPE) had an effect similar to that of MGDG, but was much less effective, even at concentrations up to 80% in EPC membranes. Arbutin-induced leakage during freezing was accompanied by massive bilayer fusion in EPC and EPC/EPE membranes. Twenty percent MGDG in EPC bilayers completely inhibited the fusogenic effect of arbutin. The membrane surface probes merocyanine 540 and 2-(6-(7-nitrobenz-2-oxa-1, 3-diazol-4-yl)amino)hexanoyl-1-hexadecanoyl-sn-glycero-3-phosph ocholi ne (NBD-C(6)-HPC) revealed that arbutin reduced the ability of both probes to partition into the membranes. Steady-state anisotropy measurements with probes that localize at different positions in the membranes showed that headgroup mobility was increased in the presence of arbutin, whereas the mobility of the fatty acyl chains close to the glycerol backbone was reduced. This reduction, however, was not seen in membranes containing 20% MGDG. The effect of arbutin on lipid order was limited to the interfacial region of the membranes and was not evident in the hydrophobic core region. From these data we were able to derive a physical model of the perturbing or nonperturbing interactions of arbutin with lipid bilayers.

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Selected References

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