26. Dietary triglycerides are hydrolyzed by pancreatic lipase, which is related to but distinct from lipase that functions in adipose tissue. Would you expect pancreatic lipase to be activated by glucagon? Why or why not?

Biochemistry
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Chapter1: Biochemistry: An Evolving Science
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26. Dietary triglycerides are hydrolyzed by pancreatic lipase, which is related to but distinct from lipase that
functions in adipose tissue. Would you expect pancreatic lipase to be activated by glucagon? Why or
why not?
27. Pancreatic lipase is structurally similar to the protease chymotrypsin, and shares the same catalytic triad
(asp-his-ser). Below is a diagram of the active site of pancreatic lipase with a triglyceride bound. Draw
A) Draw arrows on this diagram to show the mechanism for the formation of the acyl intermediate
B) Draw the acyl intermediate in the right hand box
C) Draw arrows on the acyl intermediate to show the mechanism of its hydrolysis
D) What type of catalysis is being played by the serine? By the histidine? What is the role of Phe77 and
Leui53?
Asp176
R
His263
Ser152
.R
R
Phe7"
R
Leu153
Transcribed Image Text:26. Dietary triglycerides are hydrolyzed by pancreatic lipase, which is related to but distinct from lipase that functions in adipose tissue. Would you expect pancreatic lipase to be activated by glucagon? Why or why not? 27. Pancreatic lipase is structurally similar to the protease chymotrypsin, and shares the same catalytic triad (asp-his-ser). Below is a diagram of the active site of pancreatic lipase with a triglyceride bound. Draw A) Draw arrows on this diagram to show the mechanism for the formation of the acyl intermediate B) Draw the acyl intermediate in the right hand box C) Draw arrows on the acyl intermediate to show the mechanism of its hydrolysis D) What type of catalysis is being played by the serine? By the histidine? What is the role of Phe77 and Leui53? Asp176 R His263 Ser152 .R R Phe7" R Leu153
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