Abstract
This presentation will review the 1976 discovery of the enzyme complex in cellulose biosynthesis in Oocystis apiculata. A linear terminal complex (TC) was found to be associated with a microfibril, and from other freeze fracture applications, TCs have been found in many different algal genera. In fact, the algae have the most diverse and complex TCs among all organisms. TC diversity in terms of the evolution of cellulose biogenesis will be discussed. Combining the latest information from biochemistry and molecular genetics, the multiplicity of cellulose biogenesis will be reviewed. Cellulose molecular weight, crystalline structure, and mode of glycosylation for polymer formation all indicate that cellulose biogenesis is an extremely complex process. Major questions still remain, and the enzymes for cellulose biosynthesis have yet to be crystallized and their structure elucidated; however, the wealth of new information on cellulose structure and biosynthesis from algae to vascular plants, including bacteria and tunicates, all point to a very exciting and useful area of research. The algae have played key roles in our understanding of nature's most abundant macromolecule.
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