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Pepsinogens, progastricsins, and prochymosins: structure, function, evolution, and development.

T Kageyama1

  • 1Center for Human Evolution Modeling Research, Primate Research Institute, Kyoto University, Inuyama, Japan.

Cellular and Molecular Life Sciences : CMLS
|March 28, 2002
PubMed
Summary
This summary is machine-generated.

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This study details the five types of pepsin zymogens, their evolutionary relationships, and structural features. It highlights their autocatalytic conversion to active pepsins and developmental regulation in mammals.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Evolutionary Biology

Background:

  • Five pepsin zymogen types exist: pepsinogens A, B, F, progastricsin, and prochymosin.
  • Pepsinogens are aspartic proteinases, characterized by a bilobal structure and a catalytic dyad (Asp32, Asp215).

Purpose of the Study:

  • To analyze the phylogenetic relationships of pepsinogens based on sequence data.
  • To describe the structural and functional aspects of pepsinogen activation and substrate binding.
  • To review known inhibitors and gene regulation of pepsinogen expression.

Main Methods:

  • Phylogenetic analyses using amino acid and nucleotide sequences.
  • X-ray crystallography for tertiary structure determination.
  • Biochemical characterization of activation pathways and substrate interactions.

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Main Results:

  • Progastricsin and prochymosin diverged earliest, with pepsinogens A and F being closely related.
  • Pepsinogen activation occurs via one-step or stepwise pathways at acidic pH.
  • The active site accommodates at least seven substrate residues, with preferences at P1 and P'1 positions.

Conclusions:

  • Pepsinogen structure and function are conserved across species, with variations in activation and substrate specificity.
  • Developmental expression patterns of pepsinogens are regulated by factors like steroid hormones.
  • Understanding pepsinogen biology is crucial for digestive physiology and potential therapeutic targets.