Purification and Structure Analysis of Mycolic Acids in Corynebacterium glutamicum

Yang Yang; Feng Shi; Guanjun Tao; Xiaoyuan Wang

doi:10.1007/s12275-012-1459-0

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Purification and Structure Analysis of Mycolic Acids in Corynebacterium glutamicum: Yang Yang ^1,2, Feng Shi ¹, Guanjun Tao ¹, Xiaoyuan Wang ^1,2; Journal of Microbiology 2012;50(2):235-240.
DOI: https://doi.org/10.1007/s12275-012-1459-0
Published online: April 27, 2012

¹State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, P. R. China, ²Key Laboratory of Industrial Biotechnology of Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, P. R. China

Corresponding author: Xiaoyuan Wang , Tel: +86-510-85329239,

Received: 15 September 2011 • Accepted: 14 December 2011

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Abstract

Corynebacterium glutamicum is widely used for producing amino acids. Mycolic acids, the major components in the cell wall of C. glutamicum might be closely related to the secretion of amino acids. In this study, mycolic acids were extracted from 5 strains of C. glutamicum, including ATCC 13032, ATCC 13869, ATCC 14067, L-isoleucine producing strain IWJ-1, and L-valine producing strain VWJ-1. Structures of these mycolic acids were analyzed using thin layer chromatography and electrospray ionization mass spectrometry. More than twenty molecular species of mycolic acid were observed in all 5 strains. They differ in the length (20–40 carbons) and saturation (0–3 double bonds) of their constituent fatty acids. The dominant species of mycolic acid in every strain was different, but their two hydrocarbon chains were similar in length (14–18 carbons), and the meromycolate chain usually contained double bonds. As the growth temperature of cells increased from 30°C to 34°C, the proportion of mycolic acid species containing unsaturated and shorter hydrocarbon chains increased. These results provide new information on mycolic acids in C. glutamicum, and could be useful for modifying the cell wall to increase the production of amino acids.

Keywords: Corynebacterium glutamicum;mycolic acids;electrospray ionization mass spectrometry

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Purification and Structure Analysis of Mycolic Acids in Corynebacterium glutamicum

J. Microbiol. 2012;50(2):235-240. Published online April 27, 2012

DOI: https://doi.org/10.1007/s12275-012-1459-0

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