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Research article

Environmental Microbiology and Biotechnology (EMB)  |  Protein Engineering and Evolution

Molecular and Enzymatic Features of Homoserine Dehydrogenase from Bacillus subtilis

Do Hyeon Kim1†, Quyet Thang Nguyen1,2†, Gyeong Soo Ko1†, and Jin Kuk Yang1*

1Department of Chemistry, College of Natural Sciences, Soongsil University, Seoul 06978, Republic of Korea
2Department of Information Communication, Materials, and Chemistry Convergence Technology, Soongsil University, Seoul 06978, Republic of Korea

Correspondence to:
*Phone: +82-2-820-0433
Fax: +82-2-824-4383
E-mail: jinkukyang@ssu.ac.kr

†These authors contributed equally to this work.
Received: May 1, 2020; Revised: September 25, 2020; Accepted: September 25, 2020

J. Microbiol. Biotechnol. 2020; 30(12): 1905-1911

Published December 28, 2020 https://doi.org/10.4014/jmb.2004.04060

Copyright © The Korean Society for Microbiology and Biotechnology.

Abstract

Homoserine dehydrogenase (HSD) catalyzes the reversible conversion of L-aspartate-4- semialdehyde to L-homoserine in the aspartate pathway for the biosynthesis of lysine, methionine, threonine, and isoleucine. HSD has attracted great attention for medical and industrial purposes due to its recognized application in the development of pesticides and is being utilized in the large scale production of L-lysine. In this study, HSD from Bacillus subtilis (BsHSD) was overexpressed in Escherichia coli and purified to homogeneity for biochemical characterization. We examined the enzymatic activity of BsHSD for L-homoserine oxidation and found that BsHSD exclusively prefers NADP+ to NAD+ and that its activity was maximal at pH 9.0 and in the presence of 0.4 M NaCl. By kinetic analysis, Km values for L-homoserine and NADP+ were found to be 35.08 ± 2.91 mM and 0.39 ± 0.05 mM, respectively, and the Vmax values were 2.72 ± 0.06 μmol/min-1 mg-1 and 2.79 ± 0.11 μmol/min-1 mg-1, respectively. The apparent molecular mass determined with size-exclusion chromatography indicated that BsHSD forms a tetramer, in contrast to the previously reported dimeric HSDs from other organisms. This novel oligomeric assembly can be attributed to the additional C-terminal ACT domain of BsHSD. Thermal denaturation monitoring by circular dichroism spectroscopy was used to determine its melting temperature, which was 54.8°C. The molecular and biochemical features of BsHSD revealed in this study may lay the foundation for future studies on amino acid metabolism and its application for industrial and medical purposes.

Keywords

Homoserine dehydrogenase, Bacillus subtilis

Graphical Abstract


References

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