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Related Experiment Videos

A vitamin-K2-binding factor secreted from Bacillus subtilis.

H Ikeda1, Y Doi

  • 1Department of Food Science, Kyoto Women's University, Japan.

European Journal of Biochemistry
|August 28, 1990
PubMed
Summary

Bacillus subtilis synthesizes vitamin K2, with most found intracellularly during growth. At stationary phase, a novel acidic glycoconjugate vitamin-K2-binding factor is secreted, binding menaquinone.

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Area of Science:

  • Microbiology and Biochemistry
  • Bacterial Metabolism and Secretion
  • Nutritional Biochemistry

Background:

  • Vitamin K2 (menaquinone) is essential for various physiological processes.
  • Bacillus subtilis is known to produce vitamin K2, but its secretion mechanism is not fully understood.
  • Understanding vitamin K2 production and transport in bacteria is crucial for nutritional and biotechnological applications.

Purpose of the Study:

  • To investigate the synthesis and localization of vitamin K2 in Bacillus subtilis.
  • To identify and characterize any factors involved in the secretion of vitamin K2.
  • To elucidate the nature of the secreted vitamin K2 complex.

Main Methods:

  • Bacterial growth curve analysis and vitamin K2 quantification.
  • DEAE ion-exchange chromatography for separation and purification.
  • Polyacrylamide disc gel electrophoresis for protein analysis.
  • Gel-permeation chromatography for molecular mass determination.
  • Chemical analysis of the binding factor.

Main Results:

  • Vitamin K2 synthesis by Bacillus subtilis correlated with cell growth.
  • During the stationary phase, 40% of total vitamin K2 was found in the soluble form in the incubation media.
  • A single elution peak corresponding to vitamin K2 was observed, indicating secretion as a complex.
  • A novel acidic glycoconjugate, the vitamin-K2-binding factor (100 kDa), was identified.
  • This factor binds menaquinone but not menadione and contains carbohydrate and peptide components.

Conclusions:

  • Bacillus subtilis secretes vitamin K2, primarily as a complex with an acidic binding factor, during its stationary phase.
  • The identified vitamin-K2-binding factor is a glycoconjugate crucial for menaquinone transport.
  • This discovery provides insights into bacterial vitamin K2 metabolism and secretion pathways.

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