Abstract
Structural aspects of lipoarabinomannans (LAM) from Mycobacterium tuberculosis and Mycobacterium smegmatis were investigated by using mild acid hydrolysis in combination with Fourier-transform ion cyclotron resonance (FT-ICR), and quadrupole ion trap mass spectrometry. Exact mass measurements with less than 2.5 ppm mass error confirmed the presence of a series of arabinose oligomers (Aran; n=2–7) as the major components observed following mild acid hydrolysis of both M. tuberculosis and M. smegmatis LAM. However, the mass spectrum of the resulting LAM extract also revealed a highly-abundant distribution of ions that exact mass measurements identified as mannose-linked arabinose species, AranManm+Na+ (n=1–6; m=1–3). The observed mannose caps were linked to arabinose species as mono-, di-, and trimannose units, and the ratio of the mono-, di-, and trimannose caps was determined to be 1.00:9.00:1.15, respectively, different from previous reports. Analysis of the linkage of lithiated arabinose trimer standards was accomplished with MS3 experiments and the information generated was used to identify linkages of arabinose trimers generated by mild acid hydrolysis of M. tuberculosis and M. smegmatis LAM. The MS3 spectra confirmed the linkage of arabinose trimers from M. smegmatis and M. tuberculosis LAM as predominantly α(1 → 5), α(1 → 5).
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Published online May 31, 2005
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Petzold, C.J., Stanton, L.H. & Leary, J.A. Structural characterization of lipoarabinomannans from Mycobacterium tuberculosis and Mycobacterium smegmatis by ESI mass spectrometry. J Am Soc Mass Spectrom 16, 1109–1116 (2005). https://doi.org/10.1016/j.jasms.2005.02.023
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DOI: https://doi.org/10.1016/j.jasms.2005.02.023