How Meaningful are Determinations of Glucosyltransferase Activities in Starch-Enzyme Complexes?

✍ Scribed by Prof. Dr. K. R. Chandorkar; Prof. Dr. N. P. Badenhuizen

• Publisher: John Wiley and Sons
• Year: 1966
• Tongue: English
• Weight: 619 KB
• Volume: 18
• Category: Article
• ISSN: 0038-9056
• DOI: 10.1002/star.19660180401

✦ Synopsis

The enzymatic basis of starch synthesis has assumed a different aspcct since LELOIR and coworkers suggested that nucleotides were involved rather than phosphorylase. These developments and the arguments pro antl contra starch synthesis by means of a transferase (sometimes called : starch synthetase) that will remove glucose from such substances as adenosine diphosphate glucose (ADPG) or uridine diphosphate glucose (UDPQ) antl link it to chains of the maltose series, have been discussed before (4, 19). From these discussions it would appear that i t is still premature to disc w c l phosphorylase as a starch-synthesizing enzyme, even taking into consideration recent evidence (18). Many other publications indicate that phosphorylase is connected with starch synthesis. It is always found in cells in which starch is formed, and it was recently demonstrated, for instance, that the pH in endosperm