profile-default

Mark McBride

Professor
 (414) 229-5844
 Lapham Hall N307

Education

  • Postdoctoral Fellow, University of California, Berkeley, 1991
  • PhD, University of Wisconsin-Madison, 1987
  • BS, University of Rochester, 1980

Research Interests

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.

Selected Publications

Kharade, Sampada S., and McBride, Mark J. “Flavobacterium johnsoniae PorV is required for secretion of a subset of proteins targeted to the type IX secretion system.” Journal of Bacteriology 197. (2015): 147-158.
Kharade, Sampada S., and McBride, Mark J. “The Flavobacterium johnsoniae chitinase ChiA is required for chitin utilization and is secreted by the type IX secretion system.” Journal of Bacteriology, ASM 196. (2014): 961-970.
McBride, Mark J., Liu, Weifeng, Lu, Xuemei, and Zhang, W. “The family Cytophagaceae.” The Prokaryotes 11.4 Springer, (2014): 577-593.
McBride, Mark J. “The family Flavobacteriaceae.” The Prokaryotes 11.4 Springer, (2014): 643-676.
Nan, Beiyan, McBride, Mark J., Chen, J, Zusman, David R., and Oster, George. “Bacteria that glide with helical tracks.” Current Biology 24. (2014): R169-R173.
McBride, Mark J., and Zhu, Yongtao. “Gliding motility and Por secretion system genes are widespread among members of the phylum Bacteroidetes.” Journal of Bacteriology 195. (2013): 270-278.
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.
Shrivastava, Abhishek, Rhodes, Ryan G., Pochiraju, Soumya, Nakane, Daisuke, and McBride, Mark J. “Flavobacterium johnsoniae RemA is a mobile cell surface lectin involved in gliding.” Journal of Bacteriology 194. (2012): 3678-3688.
Rhodes, Ryan G., Pucker, Halley G., and McBride, Mark J. “Development and use of a gene deletion strategy for Flavobacterium johnsoniae to identify the redundant gliding motility genes remF, remG, remH, and remI.” Journal of Bacteriology, Journal of Bacteriology 193.10 (2011): 2418-2428.
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., Van Groll, Eric J., and McBride, Mark J. “Mutations in Flavobacterium johnsoniae sprE result in defects in gliding motility and protein secretion.” Journal of Bacteriology 193.19 (2011): 5322-5327.
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.
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.