These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Endospore degradation in an oligosporogenic, crystalliferous mutant of Bacillus thuringiensis.
    Author: Sierra-Martínez P, Ibarra JE, de la Torre M, Olmedo G.
    Journal: Curr Microbiol; 2004 Feb; 48(2):153-8. PubMed ID: 15057485.
    Abstract:
    We isolated a new oligosporogenic mutant from Bacillus thuringiensis var. kurstaki HD73 that retains the ability to produce insecticidal crystal inclusions. Sporulation in this mutant initiates in a manner similar to the wild-type strain, and under the electron microscope endospores are seen, but these do not reach maturity (except for 0.2% of them). At a late stage, the coat surrounding the forespore seems to lack shape and to be empty. Most mutant cells exhibit a well-formed bipyramidal crystal but are completely devoid of the forespore. The mutant has a functional SigK holoenzyme, which is required for the expression of genes involved in the formation of spore coat and cortex and for cry1A transcription from the BtII promoter. Defective maturation of spores could be due to an inadequate forespore coat or cortex structure resulting in the arrest of sporulation at late stage III or early stage IV.
    [Abstract] [Full Text] [Related] [New Search]