Metabolic flexibility of d-ribose producer strain of Bacillus pumilus under environmental perturbations

Rajesh K. Srivastava, Soumen K. Maiti, Debasish Das, Prashant Madhusudhan Bapat, Kritika Batta, Mani Bhushan, Pramod Wangikar

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    The metabolic reaction rate vector is a bridge that links gene and protein expression alterations to the phenotypic endpoint. We present a simple approach for the estimation of flux distribution at key branch points in the metabolic network by using substrate uptake, metabolite secretion rate, and biomass growth rate for transketolase (tkt) deficient Bacillus pumilus ATCC 21951. We find that the glucose-6-phosphate (G6P) and pseudo catabolic/anabolic branch points are flexible in the d-ribose-producing tkt deficient strain of B. pumilus. The normalized flux through the pentose phosphate pathway (PPP) varied from 1.5 to 86 % under different growth conditions, thereby enabling substantial extracellular accumulation of d-ribose under certain conditions. Interestingly, the flux through PPP was affected by the extracellular phosphate concentration and dissolved oxygen concentration. This metabolic flexibility may have been the underlying reason for this strain being selected from thousands of others in a screening for d-ribose producers conducted in the 1970s.
    Original languageEnglish
    JournalJournal of Industrial Microbiology and Biotechnology
    Volume39
    Issue number8
    Pages (from-to)1227-1243
    ISSN1367-5435
    DOIs
    Publication statusPublished - 2012

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