Table 2.

Bacterial strains used in this study.

Strain	Relevant characteristics	Source (Reference)
Exiguobacterium sp. SH31	WT, arsenic resistant arsRDCBA + acr3 +	Our group (Castro-Severyn et al., 2017)
E. coli BW25113	E. coli K-12 derivative arsRCB + acr3 -	CGSC* (Baba et al., 2006)
E. coli AW3110	E. coli K-12 derivative Δars::Cam arsRCB - acr3 -	CGSC* (Carlin et al., 1995)
E. coli BW25113/pBR322-acr3	BW25113 strain transformed with a derivative pBR322 vector carrying the Exiguobacterium sp. SH31 acr3 gene	This work
E. coli AW3110/pBR322-acr3	AW3110 strain transformed with a derivative pBR322 vector carrying the Exiguobacterium sp. SH31 acr3 gene	This work

^*The E. coli Genetic Stock Center (https://cgsc.biology.yale.edu/index.php).