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. 1988 Feb;170(2):669–675. doi: 10.1128/jb.170.2.669-675.1988

Immunological characterization of ice nucleation proteins from Pseudomonas syringae, Pseudomonas fluorescens, and Erwinia herbicola.

C A Deininger 1, G M Mueller 1, P K Wolber 1
PMCID: PMC210707  PMID: 3123461

Abstract

Antibodies were raised against the InaW protein, the product of the ice nucleation gene of Pseudomonas fluorescens MS1650, after protein isolation from an Escherichia coli clone. On Western blots (immunoblots), these antibodies recognized InaW protein and InaZ protein (the ice nucleation gene product of Pseudomonas syringae S203), produced by both E. coli clones and the source organisms. The InaZ protein appeared in P. syringae S203 during stationary phase; its appearance was correlated with the appearance of the ice nucleation-active phenotype. In contrast, the InaW protein occurred at relatively constant levels throughout the growth phases of P. fluorescens MS1650; the ice nucleation activity was also constant. Western analyses of membrane preparations of P. syringae PS31 and Erwinia herbicola MS3000 with this antibody revealed proteins which were synthesized with development of the nucleating phenotype. In these species the presence or absence of the nucleating phenotype was controlled by manipulation of culture conditions. In all nucleation-positive cultures examined, cross-reacting low-molecular-weight bands were observed; these bands appeared to be products of proteolytic degradation of ice nucleation proteins. The proteolysis pattern of InaZ protein seen on Western blots showed a periodic pattern of fragment sizes, suggesting a highly repetitive site for protease action. A periodic primary structure is predicted by the DNA sequence of the inaZ gene.

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Selected References

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