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Preparation of Single-cohort Colonies and Hormone Treatment of Worker Honeybees to Analyze Physiology Associated with Role and/or Endocrine System

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Juvenile hormone esterase: biochemistry and structure.

Shizuo G Kamita¹, Bruce D Hammock

¹Department of Entomology and UCD Cancer Center, University of California, Davis, California 95616, USA.

Journal of Pesticide Science

|April 2, 2013

Summary

Insect development depends on a sharp decrease in juvenile hormone (JH). This review covers JH esterase (JHE) biochemistry and structure, aiding in distinguishing JHEs and enhancing biopesticides.

Keywords:

JH carboxylesterase inhibitor juvenile hormone esterase (JHE)

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Area of Science:

Biochemistry
Molecular Biology
Entomology

Background:

Normal insect development hinges on a precise reduction in hemolymph juvenile hormone (JH) levels.
This hormonal regulation involves decreased JH production and increased JH metabolism.
JH esterase (JHE) plays a crucial role in metabolizing JH, particularly its methyl ester.

Purpose of the Study:

To review the biochemistry and structure of authentic and recombinant JHEs across six insect orders.
To present updated criteria for differentiating JHEs from other carboxylesterases.
To explore the potential of JHE-encoding genes in improving biopesticide effectiveness.

Main Methods:

Biochemical characterization of JHEs.
Structural analysis of JHE enzymes.
Comparative analysis across different insect orders.

Main Results:

JHEs exhibit a high catalytic efficiency (kcat/KM), primarily due to a very low Michaelis constant (KM).
Diagnostic criteria are updated to better distinguish JHEs from other esterases.
The review synthesizes data on JHE properties from diverse insect species.

Conclusions:

Understanding JHE biochemistry and structure is vital for insect development studies.
Accurate identification of JHEs is important for both basic research and applied entomology.
JHE-encoding genes offer a promising avenue for developing novel, effective biopesticides.