Format

Send to

Choose Destination
Biophys J. 2012 Jul 3;103(1):146-51. doi: 10.1016/j.bpj.2012.05.045.

Flow directs surface-attached bacteria to twitch upstream.

Author information

1
Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey, USA.

Abstract

Bacteria inhabit a wide variety of environments in which fluid flow is present, including healthcare and food processing settings and the vasculature of animals and plants. The motility of bacteria on surfaces in the presence of flow has not been well characterized. Here we focus on Pseudomonas aeruginosa, an opportunistic human pathogen that thrives in flow conditions such as in catheters and respiratory tracts. We investigate the effects of flow on P. aeruginosa cells and describe a mechanism in which surface shear stress orients surface-attached P. aeruginosa cells along the flow direction, causing cells to migrate against the flow direction while pivoting in a zig-zag motion. This upstream movement is due to the retraction of type IV pili by the ATPase motors PilT and PilU and results from the effects of flow on the polar localization of type IV pili. This directed upstream motility could be beneficial in environments where flow is present, allowing bacteria to colonize environments that cannot be reached by other surface-attached bacteria.

PMID:
22828341
PMCID:
PMC3388212
DOI:
10.1016/j.bpj.2012.05.045
[Indexed for MEDLINE]
Free PMC Article

Supplemental Content

Full text links

Icon for Elsevier Science Icon for PubMed Central
Loading ...
Support Center