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Journal of Bacteriology, March 2001, p. 1621-1630, Vol. 183, No. 5
0021-9193/01/$04.00+0 DOI: 10.1128/JB.183.5.1621-1630.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
Visualization of the Attachment Organelle and
Cytadherence Proteins of Mycoplasma pneumoniae by
Immunofluorescence Microscopy
Shintaro
Seto,1
Gerlinde
Layh-Schmitt,2,
Tsuyoshi
Kenri,3 and
Makoto
Miyata1,*
Department of Biology, Graduate School of
Science, Osaka City University, Sumiyoshi-ku, Osaka
558-8585,1 and Department of Safety
Research on Biologics, National Institute of Infectious Diseases, 4-7-1 Gakuen, Musashimurayama, Tokyo, 208-0011,3
Japan, and Hygiene-Institut, Abt. Hygiene und Medizinische
Mikrobiologie, Universität Heidelberg, 69120 Heidelberg,
Germany2
Received 28 September 2000/Accepted 14 November 2000
A method was developed for protein localization in Mycoplasma
pneumoniae by immunofluorescence microscopy. The P1 adhesin protein was revealed to be located at least at one cell pole in all
adhesive cells, as has been observed by immunoelectron microscopy. Cell
images were classified according to P1 localization and assigned by DNA
content. Cells with a single P1 focus at one cell pole had a lower DNA
content than cells with two foci, at least one of which was positioned
at a cell pole. Those with one focus at each cell pole had the highest
DNA content, suggesting that the nascent attachment organelle is formed
next to the old one and migrates to the opposite cell pole before cell
division. Double staining revealed that the accessory proteins for
cytadherence
HMW1, HMW3, P30, P90, P40, and P65
colocalized
with the P1 adhesin in all cells. The localization of
cytadherence proteins was also examined in
cytadherence-deficient mutant cells with a branched morphology. In
M5 mutant cells, which lack the P90 and P40 proteins, HMW1, HMW3,
P1, and P30 were focused at the cell poles of short branches, and P65
showed no signal. In M7 mutant cells, which produce a truncated P30
protein, HMW1, HMW3, P1, P90, and P40 were focused, and P65 showed no
signal. In M6 mutant cells, which express no HMW1 and a truncated P30
protein, the P1 adhesin was distributed throughout the entire cell
body, and no signal was detected for the other proteins. These results
suggest that the cytadherence proteins are sequentially
assembled to the attachment organelle with HMW1 first, HMW3, P1, P30,
P90, and P40 next, and P65 last.
*
Corresponding author. Mailing address: Department of
Biology, Graduate School of Science, Osaka City University,
Sumiyoshi-ku, Osaka 558-8585, Japan. Phone 81(6)6605 3157. Fax:
81(6)6605 2522. E-mail: miyata{at}sci.osaka-cu.ac.jp.

Present address: Procter & Gamble Pharmaceuticals, Health Care
Research Center, Mason, OH
45040.
Journal of Bacteriology, March 2001, p. 1621-1630, Vol. 183, No. 5
0021-9193/01/$04.00+0 DOI: 10.1128/JB.183.5.1621-1630.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
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