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A series of structome analyses, that is, quantitative and three-dimensional structural analysis of a whole cell at the electron microscopic level, have already been achieved individually in  Exophiala dermatitidis, Saccharomyces cerevisiae, Mycobacterium tuberculosis , Myojin spiral bacteria, and  Escherichia coli . In these analyses, sample cells were processed through cryo-fixation and rapid freeze-substitution, resulting in the exquisite preservation of ultrastructures on the serial ultrathin sections examined by transmission electron microscopy. In this paper, structome analysis of non pathogenic  Mycolicibacterium smegmatis , basonym  Mycobacterium smegmatis , was performed. As  M. smegmatis  has often been used in molecular biological experiments and experimental tuberculosis as a substitute of highly pathogenic  M. tuberculosis , it has been a task to compare two species in the same genus,  Mycobacterium , by structome analysis. Seven  M. smegmatis  cells cut into serial ultrathin sections, and, totally, 220 serial ultrathin sections were examined by transmission electron microscopy. Cell profiles were measured, including cell length, diameter of cell and cytoplasm, surface area of outer membrane and plasma membrane, volume of whole cell, periplasm, and cytoplasm, and total ribosome number and density per 0.1 fl cytoplasm. These data are based on direct measurement and enumeration of exquisitely preserved single cell structures in the transmission electron microscopy images, and are not based on the calculation or assumptions from biochemical or molecular biological indirect data. All measurements in  M. smegmatis , except cell length, are significantly higher than those of  M. tuberculosis . In addition, these data may explain the more rapid growth of  M. smegmatis  than  M. tuberculosis  and contribute to the understanding of their structural properties, which are substantially different from  M. tuberculosis , relating to the expression of antigenicity, acid-fastness, and the mechanism of drug resistance in relation to the ratio of the targets to the corresponding drugs. In addition, data obtained from cryo-transmission electron microscopy examination were used to support the validity of structome analysis. Finally, our data strongly support the most recent establishment of the novel genus  Mycolicibacterium , into which basonym  Mycobacterium smegmatis  has been classified.

frontiers in microbiology

Mycolicibacterium smegmatis, Basonym Mycobacterium smegmatis, Expresses Morphological Phenotypes Much More Similar to Escherichia coli Than Mycobacterium tuberculosis in Quantitative Structome Analysis and CryoTEM Examination