Many bacteria possess the genes needed to produce cellulose. However, Gluconacetobacter xylinus (formerly Acetobacter xylinum) is used for studies of the biochemistry and genetics of cellulose biosynthesis. Structurally cellulose is a simple polysaccharide, in that it consists only of one type of sugar (glucose), and the units are linearly arranged and linked together by β-1,4 linkages only. The mechanism of biosynthesis is however rather complex, partly because in native celluloses the chains are organized as highly ordered water-insoluble fibers. Currently the key genes involved in cellulose biosynthesis and regulation are known in a number of bacteria, but many details of the biochemistry of its biosynthesis are still not clear. A survey of genome sequence databases clearly indicates that a very large number of bacteria have the genes needed to produce cellulose, and this has also been experimentally confirmed for a smaller number of organisms. The biological functions of bacterial celluloses vary among species, and range from a role as a floating device to involvement in plant root adhesion and biofilm formation.
Valla et al from Chapter 3 in Microbial Production of Biopolymers and Polymer Precursors

Further reading: Microbial Production of Biopolymers and Polymer Precursors

Labels: bacterium, biopolymers, biotechnology, cellulose