Isolation of Plasmid DNA Sequences That Complement Mutants Deficient in the Capacity for CO-dependent Growth Free

Abstract

Mutants deficient in the proper regulation and derepression of ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBPC/O) in were isolated by ethyl methanesulphonate (EMS) and Tn5 mutagenesis of a parental strain. Mutants were identified by their ability to grow under conditions where the organism requires basal levels of RuBPC/O for growth yet fail to grow under conditions which require derepression of the enzyme (Aut). The newly isolated Aut mutants exhibited phenotypes distinguishable from the previously isolated Aut mutant, strain KW25/11. Rocket immunoelectrophoretic examination of RuBPC/O levels revealed marked variance in the ability of mutants to derepress form I and form II RuBPC/O in the absence of exogenous carbon. Evidence that some of the mutants possessed different mutations was substantiated by complementation of the EMS-generated mutants by entirely different genes isolated from a genomic library of constructed in the broad-host-range cosmid vector pVK102. Southern hybridization analysis of the complementing library isolates showed the complementing genes to be normally carried on the endogenous plasmids of . The gene complementing mutant strain KW25/11 was mapped by Tn5 insertional inactivation and the complementing region found to reside on a 1·5 kb I-HI fragment. Complemented strains were unable to match wild-type levels of RuBPC/O under conditions requiring derepression of the enzyme, except for mutant strain EMS45. The Aut phenotype, represented by the mutants isolated in this study, stems from a deficiency in some aspect of photoautotrophic growth.

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1989-06-01
2024-03-29
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