Using nanotechniques to explore microbial surfaces.

Our current understanding of microbial surfaces owes much to the development of electron microscopy techniques. Yet, a crucial limitation of electron microscopy is that it cannot be used to examine biological structures directly in aqueous solutions. In recent years, however, atomic force microscopy (AFM) has provided a range of new opportunities for viewing and manipulating microbial surfaces in their native environments. Examples of AFM-based analyses include visualizing conformational changes in single membrane proteins, the real-time observation of cell-surface dynamics, analysing the unfolding of cell-surface proteins and detecting individual cell-surface receptors. These analyses have contributed to our understanding of the structure–function relationships of cell surfaces and will hopefully allow new applications to be developed for AFM in medicine and biotechnology

Towards nanomicrobiology using atomic force microscopy

At the cross-roads of nanoscience and microbiology, the nanoscale analysis of microbial cells using atomic force microscopy (AFM) is an exciting, rapidly evolving research field. Over the past decade, there has been tremendous progress in our use of AFM to observe membrane proteins and live cells at high resolution. Remarkable advances have also been made in applying force spectroscopy to manipulate single membrane proteins, to map surface properties and receptor sites on cells and to measure cellular interactions at the single-cell and single-molecule levels. In addition, recent developments in cantilever nanosensors have opened up new avenues for the label-free detection of microorganisms and bioanalytes