The Escherichia Coli Histone-like Protein HU Has a Role in Stationary Phase Adaptive Mutation

Overview

Journal Genetics

Publisher Oxford University Press

Specialty Genetics

Date 2007 Aug 28

PMID 17720921

Citations 11

Authors

Ashley B Williams

Patricia L Foster

Affiliations

Soon will be listed here.

Abstract

Stationary phase adaptive mutation in Escherichia coli is thought to be a mechanism by which mutation rates are increased during stressful conditions, increasing the possibility that fitness-enhancing mutations arise. Here we present data showing that the histone-like protein, HU, has a role in the molecular pathway by which adaptive Lac(+) mutants arise in E. coli strain FC40. Adaptive Lac(+) mutations are largely but not entirely due to error-prone DNA polymerase IV (Pol IV). Mutations in either of the HU subunits, HUalpha or HUbeta, decrease adaptive mutation to Lac(+) by both Pol IV-dependent and Pol IV-independent pathways. Additionally, HU mutations inhibit growth-dependent mutations without a reduction in the level of Pol IV. These effects of HU mutations on adaptive mutation and on growth-dependent mutations reveal novel functions for HU in mutagenesis.

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