As a glycogen phosphorylase, GPBB catalyzes the phosphorolysis of glycogen to yield glucose 1-phosphate.
2.
A phosphate group breaks the bond between C 1 of a glucose ring and the O that connects it to the next ( phosphorolysis ).
3.
As a glycogen phosphorylase, PYGL catalyzes the phosphorolysis of an ?-1, 4-glycosidic bond in glycogen to yield glucose 1-phosphate.
4.
In addition, sometimes phosphorolysis is preferable to hydrolysis ( like in the breakdown of glycogen or starch, as in the example above ) because glucose 1-phosphate yields more ATP than does free glucose when subsequently catabolized to pyruvate.
5.
The catabolism of 5'- methylthioadenosine in " Pseudomonas aeruginosa " involves deamination to S-methyl-5'- thioinosine ( EC 3.5 . 4.31, S-methyl-5'- thioadenosine deaminase ) and phosphorolysis to hypoxanthine.
6.
The mechanism for this reaction is as follows the enzymatic phosphorolysis of N, N-diacetylchitobiose phosphorylase begins with the direct nucleophilic attack to the glycosidic bond with the aid of D492 or aspartic acid residue 492 of the active site of the enzyme, which donates a proton to the glycosidic oxygen atom, and then proceeds through an oxocarbenium cation activated by ion-like transition state.
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