Lipoprotein as a regulator of starch synthesizing enzyme activity.
Amylose precipitating factor, a lipoprotein, functions as a regulator of in vitro activity of glycogen/starch phosphorylase and of A/UDPglucose glucosyltransferase. The results suggest that this lipoprotein could act to stimulate the in vivo production by phosphorylase of long, linear glucans (amylose) from the short chain precursors. The lipoprotein also appears to switch A/UDPglucose glucosyltransferase from the elongation of branched glucan molecules (amylopectin and glycogen) to the elongation of linear glucans (amylose).
D000688:Amylose / Q000502:physiology; D005964:Glucosyltransferases / Q000378:metabolism; D007700:Kinetics; D008074:Lipoproteins / Q000502:physiology*; D009492:Neurospora crassa / Q000378:metabolism; D006005:Phosphorylases / Q000378:metabolism; D013213:Starch / Q000096:biosynthesis*
D008074:Lipoproteins; D013213:Starch; D000688:Amylose; D005964:Glucosyltransferases; D006005:Phosphorylases