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Related Experiment Videos

Gastric lipase: crystal structure and activity.

S Canaan1, A Roussel, R Verger

  • 1Laboratoire de Lipolyse Enzymatique, CNRS-IFR1 UPR 9025, 31 chemin Joseph Aiguier, 13402, Marseilles, France.

Biochimica Et Biophysica Acta
|November 26, 1999
PubMed
Summary

Human gastric lipase, crucial for fat digestion in the stomach, has had its structure solved. This breakthrough reveals the enzyme

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Enzymology

Background:

  • Fat digestion involves pancreatic lipase and gastric lipase.
  • Gastric lipase functions in the acidic stomach environment.

Purpose of the Study:

  • Determine the structure of human gastric lipase.
  • Understand its stability and activity in acidic conditions.

Main Methods:

  • Recombinant human gastric lipase was purified.
  • X-ray crystallography was used to solve the enzyme's structure at 3.0 A resolution.

Main Results:

  • The first structure of a mammalian acid lipase family member was determined.
  • The enzyme features a core alpha/beta hydrolase domain and an extrusion domain.
  • A catalytic triad (Ser 153, His 353, Asp 324) and oxyanion hole were identified.
  • N-glycosylation sites and a substrate-blocking lid mechanism were observed.
  • A phosphonate inhibitor elucidated the active site and substrate binding location.

Conclusions:

  • The solved structure provides insights into gastric lipase's function.
  • The lid mechanism explains substrate access to the active site.
  • This research lays the groundwork for understanding acid lipase family enzymes.

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