- Postdoctoral Fellow, University of California, Berkeley, 1991
- PhD, University of Wisconsin-Madison, 1987
- BS, University of Rochester, 1980
The molecular mechanism by which swimming bacteria are propelled through liquid media by rotating flagella is understood relatively well. Gliding motility (movement of cells over surfaces without the aid of flagella) is a trait common to many bacteria, yet the mechanisms responsible for gliding motility are poorly understood. My lab uses the techniques of genetics, molecular biology, biochemistry, and microscopy to determine the mechanism of Flavobacterium johnsoniae gliding motility. We developed techniques to allow genetic manipulation of this organism, and have used these techniques to isolate nonmotile mutants and to identify the genes that are altered in these mutants. These genes code for proteins that make up the gliding motility apparatus (‘motor’) that propels the cells. We use antibodies raised against these proteins to localize the components of the motor, determine how they interact, and visualize the gliding motility apparatus in cells. Based on our results we have developed a model for Flavobacterium gliding that involves the active movement of adhesive fibrils along the cell surface. We also identified a novel protein secretion system that is involved in assembly of the motility apparatus.
In addition to studies on gliding motility, we are also investigating other aspects of the biology of gliding bacteria. These bacteria are abundant in many environments and some have characteristics that make them important organisms to study. Examples of applied projects include studies of chitin digestion by F. johnsoniae, studies of cellulose digestion by Cytophaga hutchinsonii, and genetic analysis of the fish pathogens Flavobacterium psychrophilum and Flavobacterium columnare.
Zhu, Yongtao, Han, Lanlan, Hefferon, Kathleen L., Silvaggi, Nicholas R., Wilson, David B., and McBride, Mark J. “Periplasmic Cytophaga hutchinsonii endoglucanases are required for use of crystalline cellulose as sole carbon and energy source.” Applied and Environmental Microbiology.
Li, N, Qin, T, Zhang, X L., Huang, B, Liu, Z X., Xie, H X., Zhang, J, McBride, Mark J., and Nie, P. “Gene deletion strategy to examine the involvement of the two chondroitin lyases in Flavobacterium columnare virulence.” Applied and environmental microbiology
81.21 (2015): 7394-402.
Nakane, Daisuke, Sato, Keiko, Wada, Hirofumi, McBride, Mark J., and Nakayama, Koji. “Helical flow of surface protein required for bacterial gliding motility.” Proceedings of the National Academy of Sciences, USA
110. (2013): 11145-11150.
Shrivastava, Abhishek, Johnston, Joseph J., van Baaren, Jessica M., and McBride, Mark J. “Flavobacterium johnsoniae GldK, GldL, GldM, and SprA are required for secretion of the cell surface gliding motility adhesins SprB and RemA.” Journal of Bacteriology
195. (2013): 3201-3212.
Rhodes, Ryan G., Nelson, Shawn S., Pochiraju, Soumya, and McBride, Mark J. “Flavobacterium johnsoniae sprB is part of an operon spanning the additional gliding motility genes sprC, sprD, and sprF.” Journal of Bacteriology, Journal of Bacteriology
193.3 (2011): 599-610.
Rhodes, Ryan G., Samarasam, Mudiarasan N., Shrivastava, Abhishek, van Baaren, Jessica M., Pochiraju, Soumya, Bollampalli, Sreelekha, and McBride, Mark J. “Flavobacterium johnsoniae gldN and gldO are partially redundant genes required for gliding motility and surface localization of SprB.” Journal of Bacteriology
192.5 (2010): 1201-1211.
Sato, Keiko, Naito, Mariko, Yukitake, Hideharu, Harakawa, Hideki, Shoji, Mikio, McBride, Mark J., Rhodes, Ryan G., and Nakayama, Koji. “A protein secretion system linked to bacteroidete gliding motility and pathogenesis.” Proceedings of the National Academy of Sciences USA
107.1 (2010): 276-281.