Table 1.

Strains and plasmids used in this study

Strains	Characteristics	Reference
Pseudomonas sp. B4 constitutive polyP(-)	Pseudomonas sp. B4 transfomant with pS7PPX1 plasmid	This study
Pseudomonas sp. B4 constitutive control	Pseudomonas sp. B4 transfomant with pMLS7 plasmid	This study
Pseudomonas sp. B4 regulated polyP(-)	Pseudomonas sp. B4 transfomant with pBADPPX1 plasmid	This study
Pseudomonas sp. B4 regulated control	Pseudomonas sp. B4 transfomant with pMLBAD plasmid	This study
Escherichia coli NR100	M15 (pREP) derivative with pQE30PPK plasmid	[24]
Plasmids
pGEM®-T-easy	T-vector cloning system	Promega
pMLBAD	Broad-host range regulated expression vector	[22]
pMLS7	Broad-host range constitutive expression vector	[22]
pTYPPX1	pGEM®-T-easy with PPX1 gene from S. cerevisiae. (His6 tag)	This study
pS7PPX1	pMLS7 with PPX1 gene from S. cerevisiae. (His6 tag)	This study
pBADPPX1	pMLBAD with PPX1 gene from S. cerevisiae. (His6 tag)	This study