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By Felix Bronner and Arnost Kleinteller (Eds.)

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5H),but Methylococcus cupsulutus has 20 HOWARD GOLDFINE 8% phosphatidylcholine and Methylosinus trichosporium is rich in N-methylethanolamine and N,N’-dimethylethanolamine, as well as choline phosphatides (Makula, 1978). However, Weaver ef NI. (1975) reported mainly phosphatidylglycerol and phosphatidylethanolamine in the latter organism. Unlike M . capsulatus and M . rnethanolica, which have intracytoplasmic membranes consisting of vesicular disks organized into bundles (type I), M . trichosporium has type I1 membranes, which are characteristically arranged either at the periphery of the cells or paired and extending throughout the cells.

An ornithine lipid was also detected. , 1979). An unusual class of lipids, based on the sulfonolipid capnine (2-amino-3-hydroxy15-methylhexadecane-I -sulfonic acid), has been found as a major constituent of the cell envelope of Capnocytophuga (Godchaux and Leadbetter, 1980). These lipids are similar to 1 -deoxyceramide-1 -sulfonic acid previously found as a minor component of the diatom Nirzschin alba (Anderson et a / . , 1978). Some species have the free form of capnine, but most have N-acylcapnines in which the acyl moieties are rich in 2- and 3-hydroxy groups, and have methyl branches (Godchaux and Leadbetter, 1981).

The principal phospholipid is phosphatidylethanolamine, which may be accompanied by polyglycerolphosphatides (Fig. , 1970a). , 1978). TABLE I11 CHARACTERI~TIC. POLARLiPrns OF T H E SPIROCHETES Lipid Monoglycosyldiglyceride Cholesterylglucosides Phosphatidylchol ine Phocphatidylethanolamine ‘I Spirochneru Treponumu + + ~ ~ Leptospiru - + + Except T . prillidum (Nichols virulent strain) (Matthews ef a l . , 1979) Borreliii + + + + 18 HOWARD GOLDFINE The lipid composition of B . hermsi is therefore similar to that of the treponemes, except that the latter do not have cholesterylglucosides.

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