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 Previous Article

Journal of Bacteriology, February 2000, p. 855-858, Vol. 182, No. 3
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Posttranslational Processing of Methanococcus voltae Preflagellin by Preflagellin Peptidases of M. voltae and Other Methanogens

Jason D. Correia and Ken F. Jarrell*

Department of Microbiology and Immunology, Queen's University, Kingston, Ontario, Canada K7L 3N6

Received 4 August 1999/Accepted 11 November 1999

Methanococcus voltae is a mesophilic archaeon with flagella composed of flagellins that are initially made with 11- or 12-amino-acid leader peptides that are cleaved prior to incorporation of the flagellin into the growing filament. Preflagellin peptidase activity was demonstrated in immunoblotting experiments with flagellin antibody to detect unprocessed and processed flagellin subunits. Escherichia coli membranes containing the expressed M. voltae preflagellin (as the substrate) were combined in vitro with methanogen membranes (as the enzyme source). Correct processing of the preflagellin to the mature flagellin was also shown directly by comparison of the N-terminal sequences of the two flagellin species. M. voltae preflagellin peptidase activity was optimal at 37°C and pH 8.5 and in the presence of 0.4 M KCl with 0.25% (vol/vol) Triton X-100.

* Corresponding author. Mailing address: Department of Microbiology and Immunology, Queen's University, Kingston, Ontario K7L 3N6, Canada. Phone: (613) 533-2456. Fax: (613) 533-6796. E-mail: jarrellk{at}post.queensu.ca.

Journal of Bacteriology, February 2000, p. 855-858, Vol. 182, No. 3
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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