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PHYSICOCHEMICAL CHARACTERIZATION OF TETRAETHER LIPIDS FROM THERMOPLASMA-ACIDOPHILUM .5. EVIDENCE FOR THE EXISTENCE OF A METASTABLE STATE IN LIPIDS WITH ACYCLIC HYDROCARBON CHAINS
被引:11
作者:
BLOCHER, D
[1
]
GUTERMANN, R
[1
]
HENKEL, B
[1
]
RING, K
[1
]
机构:
[1] UNIV CLIN FRANKFURT,DEPT MICROBIOL CHEM,GUSTAV EMBDEN ZENTRUM BIOL CHEM,FRANKFURT,GERMANY
关键词:
(T. acidophilum);
Calorimetry;
Differential thermoanalysis;
Phase transition;
Tetraether lipid;
D O I:
10.1016/0005-2736(90)90208-6
中图分类号:
Q5 [生物化学];
Q7 [分子生物学];
学科分类号:
071010 ;
081704 ;
摘要:
The main glycophospholipid of Thermoplasma acidophilum, grown at 39° C, is composed of a di-isopranol-2,3-glycerotetraether. It has been characterized in hydrated systems by calorimetry. Unlike its equivalent grown at 59° C, it shows complex phase properties, which include at least three different phases, (1) a liquid-analogue state (C), which is stable above 20° C, (2) a metastable solid-analogue state (A) formed by supercooling of the liquid-analogue state (C) and (3) a stable solid-analogue state (B), which is slowly formed and may include a close chain packing of lipids and a network of hydrogen bonds between the headgroups. A high fraction of acyclic isopranol chains seems to be a prerequisite for the formation of state (B). A phase diagram, displaying the observed states and the transitions between them is proposed. © 1990.
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页码:54 / 60
页数:7
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