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Heterologous expression of phosphoenolpyruvate carboxylase enhances the phosphate solubilizing ability of fluorescent pseudomonads by altering the glucose catabolism to improve biomass yield.

Abstract：

:The Synechococcus elongatus PCC 6301 phosphoenolpyruvate carboxylase (ppc) gene was constitutively overexpressed in fluorescent pseudomonads, to increase the supply of oxaloacetate, a crucial anabolic precursor and an intermediate in biosynthesis of organic acids implicated in phosphate (P) solubilization. Pseudomonas fluorescens ATCC 13525, transformed with pAB3 plasmid containing the ppc gene showed a 14-fold increase in PPC activity under P-sufficiency resulting in increased carbon flow through the direct oxidative pathway and reduced metabolic overflow. Under P-limitation, contribution of the direct oxidative pathway significantly increased in P. fluorescens ATCC 13525; however, ppc overexpression enhanced glucose catabolism through intracellular phosphorylative pathway. These results correlated with gluconic, pyruvic and acetic acid levels as well as the activities of key glucose catabolic enzymes. Irrespective of the P-status, ppc overexpression improved biomass yield without altering growth rate, resulting in improved P- solubilizing abilities of P. fluorescens ATCC 13525 as well as of the wheat rhizosphere fluorescent pseudomonads isolates Fp585, P109 and Fp315. Collectively, ppc overexpression reversed the P-status dependent glucose distribution between the direct oxidative and phosphorylative pathways of glucose catabolism in P. fluorescens ATCC 13525 and presents a feasible genetic engineering approach for developing efficient P-solubilizing bacteria.

journal_name

Bioresour Technol

journal_title

Bioresource technology

authors

Buch A,Archana G,Naresh Kumar G

doi

10.1016/j.biortech.2009.08.075

subject

Has Abstract

pub_date

2010-01-01 00:00:00

pages

679-87

issue

2

eissn

0960-8524

issn

1873-2976

pii

S0960-8524(09)01083-9

journal_volume

101

pub_type

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