A color-based competition assay for studying bacterial stress responses in Micrococcus luteus.

Abstract:

:Competition assays measure differences between populations of bacteria after stress adaptation, populations of different bacteria and mutations in antibiotic resistance genes. We have developed a competition-based assay to evaluate if genes upregulated under starvation are important for bacterial survival. Stress responses are critical for survival in non-pathogenic and pathogenic bacteria alike including Mycobacterium tuberculosis, Enterococcus fecaelis, Escherichia coli and Staphylococcus aureus. Unfortunately, most stress-survival proteins are poorly understood because suitable model bacteria and techniques are limited. To address this problem, we have engineered Micrococcus luteus NCTC 2665 (M. luteus) for competition assays by inactivating the sarcinaxanthin biosynthesis gene crtE (ΔcrtE), changing M. luteus colonies from yellow to white. This change allows easy identification in mixed cultures. The crtE knockout is relatively neutral for growth in complex and minimal acetate media and shows a measured fitness of one in competition with yellow wild-type bacteria. The ΔcrtE M. luteus competition assay identified a competition defect in a M. luteus strain when a specific universal stress protein was inactivated, suggesting a negative survival phenotype for this protein. We anticipate this competition assay can identify defects in other gene knockouts and mutational studies in M. luteus and will enhance our understanding of bacterial survival mechanisms.

journal_name

FEMS Microbiol Lett

authors

Havis S,Rangel J,Mali S,Bodunrin A,Housammy Z,Zimmerer R,Murphy J,Widger WR,Bark SJ

doi

10.1093/femsle/fnz054

subject

Has Abstract

pub_date

2019-03-01 00:00:00

issue

5

eissn

0378-1097

issn

1574-6968

pii

5379281

journal_volume

366

pub_type

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