Second Harmonic Generation Spectroscopy of Membrane Probe Dynamics in Gram-Positive Bacteria.

ABSTRACT: Bacterial membranes are complex mixtures with dispersity that is dynamic over scales of both space and time. To capture adsorption onto and transport within these mixtures, we conduct simultaneous second harmonic generation (SHG) and two-photon fluorescence measurements on two different gram-positive bacterial species as the cells uptake membrane-specific probe molecules. Our results show that SHG not only can monitor the movement of small molecules across membrane leaflets but also is sensitive to higher-level ordering of the molecules within the membrane. Further, we show that the membranes of Staphylococcus aureus remain more dynamic after longer times at room temperature in comparison to Enterococcus faecalis. Our findings provide insight into the variability of activities seen between

SUBMITTER: Miller LN 

PROVIDER: S-EPMC6817639 | biostudies-literature | 2019 Oct

REPOSITORIES: biostudies-literature