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Microbiology 148 (2002), 3119-3127
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Microbiology (2002), 148, 3119-3127.
© 2002 Society for General Microbiology

Molecular Genetics and Immunobiology of Mycobacteria

The HPLC-double-cluster pattern of some Mycobacterium gordonae strains is due to their dicarboxy-mycolate content

José Astola1, Manuel Muñoz1, Marco Sempere2, Pere Coll1,3, Marina Luquin1 and Pedro L. Valero-Guillén4

Departament de Genètica i Microbiologia, Universitat Autònoma de Barcelona, Spain1
Hospital Costa del Sol, Marbella, Málaga, Spain2
Hospital de la Santa Creu i Sant Pau, Barcelona, Spain3
Departamento de Genética y Microbiología, Facultad de Medicina, Universidad de Murcia, Aptdo. 4012, Campus Universitario de Espinardo, 30100 Murcia, Spain4

Author for correspondence: Pedro L. Valero-Guillén. Tel:+34 968 360953. Fax:+34 968 360950. e-mail: plvalero{at}um.es

The mycolic acids of several strains of Mycobacterium gordonae were examined by chromatographic and spectroscopic techniques. Both HPLC and TLC revealed two patterns of mycolates among the M. gordonae strains studied. As determined by TLC, one pattern was composed of {alpha}-, methoxy- and keto-mycolates; the other was composed of these mycolates plus an additional component, which was identified as dicarboxy-mycolates. The dicarboxy-mycolates were only found in those M. gordonae strains that displayed a so-called HPLC-double-cluster pattern. Detailed structural analyses of the dicarboxy-mycolates indicated that these compounds contained predominantly 61–65 carbon atoms (C63 was the major component) and a trans-1,2-disubstituted cyclopropane ring. Thus, the dicarboxy-mycolate content of strains of M. gordonae determines their HPLC pattern. In spite of the differences in their HPLC patterns, and although they belonged to different PCR-restriction length polymorphism clusters, all of the M. gordonae strains examined in this study were closely related on the basis of the structural features of their {alpha}-, keto- and methoxy-mycolates; the predominant {alpha}-mycolates contained two cis-1,2-disubstituted cyclopropane rings, the major keto-mycolates contained a trans-1,2-disubstituted cyclopropane ring and the methoxy-mycolates contained one cis- or one trans-1,2-disubstituted cyclopropane ring. It is noteworthy that the strains containing dicarboxy-mycolates also displayed significant amounts of {alpha}-mycolates that contained one cis-1,2-disubstituted cyclopropane ring and one cis double bond. The results obtained in this study demonstrate heterogeneity among M. gordonae strains.

Keywords: mycolic acids, high-performance liquid chromatography, M. gordonae

Abbreviations: EI-MS, electron-impact MS; FAB-MS, fast-atom bombardment MS; Gen-Probe, Gen-Probe Rapid Diagnostic System; PRA, PCR-restriction length polymorphism analysis




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