Lipids and fatty acids in cellulosomes of Clostridium thermocellum View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1994-10

AUTHORS

A. V. Bolobova, A. V. Zhukov, A. A. Klyosov

ABSTRACT

A lipid component was found in cellulosomes (multienzymatic cellulase complexes) of the thermophilic bacterium Clostridium thermocellum. Two major fractions of the cellulosomes have been studied, one with a relative molecular mass (Mr) of 10–50 million (polycellulosomes, fraction A) and the other with an Mr 0.5–10 million (fraction B) It was found that the larger cellulosomes contained higher relative amounts of lipids (8.1%) as well as Ca2+ ions (0.6%), and showed higher cellulolytic activity Among the lipids was cardiolipin, 1,2- and 1,3-diglycerides, triglycerides, and up to 11 free fatty acids, including both saturated (palmitic, lauric, myristic, pentadecanoic, stearic, arachinic) and unsaturated (myristoleic, palmitoleic, and oleic) moieies Cardiolipin was a major phospholipid component in cellulosomes and was also found to be a major phospholipid component of the cell membrane, palmitic acid was a major fatty acid Fraction B contained less fatty acids (0.5% vs 1.27% in fraction A) with fewer acids detected than in fraction A Removal of the extractable lipids led to fragmentation of the cellulosomes with a concurrent sharp drop in their enzymatic activity Total removal of the lipids from cellulosomes was possible only when the proteins were completely denatured The qualitative composition of the extractable and non-extractable fatty acids was the same The lipid component of the cellulosomes, containing a high content of the unsaturated fatty acids, was located mainly in the part of cellulosomes that is in tight contact with the cellulose surface, and it apparently plays an important role in the tight adsorption of the cellulosomes on cellulose. More... »

PAGES

128-133

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00170235

DOI

http://dx.doi.org/10.1007/bf00170235

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1044037490


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