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Amino- and carboxy-terminal PEST domains mediate gastrin stabilization of rat L-histidine decarboxylase isoforms.

J V Fleming¹, T C Wang

¹Department of Medicine, Harvard Medical School, and Gastrointestinal Unit, Massachusetts General Hospital, Boston, MA 02114, USA.

Molecular and Cellular Biology

|June 10, 2000

Summary

This summary is machine-generated.

Gastrin, a peptide hormone, enhances the stability of L-histidine decarboxylase (HDC) isoforms, increasing their levels without affecting mRNA. This regulation involves two PEST domains, revealing a novel mechanism for peptide hormone control over protein degradation.

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Computational Prediction of Amino Acid Preferences of Potentially Multispecific Peptide-Binding Domains Involved in Protein-Protein Interactions

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Published on: January 26, 2024

Area of Science:

Biochemistry
Molecular Biology
Endocrinology

Background:

Peptide hormones regulate enzyme function through various pathways, including protein degradation.
Gastrin is a peptide hormone that interacts with the cholecystokinin B-gastrin receptor.
Gastrin influences the activity of L-histidine decarboxylase (HDC), the enzyme responsible for histamine production.

Purpose of the Study:

To investigate the mechanism by which gastrin regulates L-histidine decarboxylase (HDC) protein levels.
To determine if gastrin affects HDC mRNA or protein stability.
To identify regulatory domains involved in gastrin-mediated control of HDC.

Main Methods:

Pulse-chase experiments to assess HDC isoform degradation rates.
Deletion analysis to identify functional domains within HDC.
Fusion protein experiments to evaluate the role of PEST domains in protein degradation.
Analysis of intracellular localization using fluorescent chimeras.

Main Results:

Gastrin increases steady-state levels of HDC isoforms without altering HDC mRNA levels.
Gastrin enhances HDC isoform stability, indicating regulation at the post-translational level.
Two PEST domains (PEST1, PEST2) and an ER2 domain were identified as key regulators of HDC protein expression.
PEST1 and PEST2 function as potent, transferable degradation signals regulated by gastrin and proteasome inhibition.
Gastrin's effect on PEST domains is independent of antizyme/antizyme inhibitor pathways.
Gastrin does not alter the endoplasmic reticulum localization mediated by the ER2 domain.

Conclusions:

Gastrin stabilizes HDC isoforms through two distinct, transferable PEST domains that control protein degradation.
This study reveals a novel mechanism where peptide hormones can modulate protein stability by interfering with PEST domain-mediated degradation.
The findings suggest gastrin can impact the stability of other PEST domain-containing proteins, offering new insights into hormonal regulation.