Biosynthesis of Starch, Glycogen, and Cellulose

There also was a report that a lipid carrier might be involved in liver glycogen biosynthesis. Behrens and Leloir [99] showed that a fraction from liver could 

Reaction 2 attack of C-6 hydroxyl group of the second chain onto the enzyme-amylose chain covalent complex to form a-1,6 branch linkage 

Finished product of the transfer of chain I to chain II, giving attachment of chain I to chain II by an a-1,6 branch linkage 

Two types of branching enzymes have been identified in some plants, one that converts amylose into amylopectin, and the other that converts amylopectin into phytoglycogen [104]. The difference between the two enzymes apparently is in the specificity of the number of glucose residues between the branch points that each enzyme permits. 

Particulate enzyme fractions from mung bean seedlings and from cotton bolls were found to incorporate C-glucose from UDP-[U- C]-Glc into an alkali-insoluble polymer that was probably cellulose [105,106]. A cell-free extract ob- 

---