BLG 151 Lecture 11: Chapter 11 (continued part 11.9-11.11) notes
2 Dec 2016
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11. 9 catabolism of organic molecules other than glucose. Many different carbohydrates can serve as energy source. Carbohydrates can be supplied externally or internally (from internal reserves) Monosaccharides: converted to other sugars that enter glycolytic pathway. Disaccharides and polysaccharides: cleaved by hydrolases or phosphorylases. Polysaccharides: degraded by bacteria, archaea and fungi (exoenzymes) Cellulose: extracellular cellulases produced by fungi and some bacteria. Agar: agarose produced by some actinomycetes and cytophaga from marine habitats. Pectin: some soil bacteria and plant pathogens. Used as energy sources in abdsence of external nutrients. (glucose)n + pi (glucose)n-1 + glucose-1-p. Hydrolyzed to glycerol and fatty acids by lipases. Fatty acids often oxidized via beta-oxidation pathway 2 carbon units are released as acetyl co-a and fed into the tca cycle or used in biosynthesis. Nadhand fadh2 are also produced etc. Deamination: removal of amino group from amino acid. Can occur through transamination: the alpha amino group of alanine is transferred to the acceptor alpha-ketoglutyrate.
