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Similar to LPS of Salmonella R-mutants of chemotypes Rd1 and Rd2, the sole neutral sugar constituent is an aldoheptose. The heptose of R. gelatinosa LPS has the D-glycero-D-manno- configuration, in contrast to the L-glycero-D-mannoheptose of enterobacterial LPS. 2-Keto-3-deoxyoctonate forms the acid-labile linkage between the lipid moiety (lipid A) and the oligosaccharide moiety of R. gelatinosa LPS. Like enterobacterial lipid A, lipid A of this species contains phosphate and D-glucosamine as the sole amino sugar. The fatty acid spectrum conprises beta-hydroxycapric, lauric, and myristic acids. Beta-Hydroxymyristic acid, the typical fatty acid of enterobacterial LPS, is lacking. The R. gelatinosa LPS show O-antigenic acitivity; passive hemagglutinations with untreated or heat-treated (not well alkali-treated) LPS and antisera prepared against heat-killed cells yield high titers. According to the serological cross-reactions observed, the LPS of the 12 strains could be arranged into two different serotypes: serotype I comprising strains 29\/1, 29\/2, 25\/2, and serotype II comprising strains 44\/K\/6, 3\/1, IS\/10, 39\/2, Dr2, 2150, P8P9, K32, P18f3.1. No serological cross-reactions were observed between LPS of these two different serotypes in passive hemagglutinations.<\/jats:p>","DOI":"10.1128\/jb.123.2.449-455.1975","type":"journal-article","created":{"date-parts":[[2020,1,3]],"date-time":"2020-01-03T15:46:54Z","timestamp":1578066414000},"page":"449-455","update-policy":"https:\/\/doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":28,"title":["Lipophilic O-antigens containing D-glycero-D-mannoheptose as the sole neutral sugar in Rhodopseudomonas gelatinosa"],"prefix":"10.1128","volume":"123","author":[{"given":"J","family":"Weckesser","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"H","family":"Mayer","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"G","family":"Drews","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"I","family":"Fromme","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"235","reference":[{"key":"p_1","doi-asserted-by":"crossref","first-page":"1605","DOI":"10.1139\/m67-210","article-title":"o-Glycero-o-mannoheptose as a component of lipopolysaccharides from gram-negative bacteria","volume":"132","author":"Adams G. 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