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Infection and Immunity, April 2001, p. 1977-1982, Vol. 69, No. 4
0019-9567/01/$04.00+0   DOI: 10.1128/IAI.69.4.1977-1982.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Plasminogen Binding and Activation by Mycoplasma fermentans

Amichai Yavlovich,1 Abd A.-R. Higazi,2 and Shlomo Rottem1,*

Department of Membrane and Ultrastructure Research, The Hebrew University-Hadassah Medical School,1 and Department of Clinical Biochemistry, Hadassah Hospital, Mount Scopus,2 Jerusalem, Israel

Received 23 June 2000/Returned for modification 14 September 2000/Accepted 15 December 2000

The binding of plasminogen to Mycoplasma fermentans was studied by an immunoblot analysis and by a binding assay using iodine-labeled plasminogen. The binding of 125I-labeled plasminogen was inhibited by unlabeled plasminogen, lysine, and lysine analog varepsilon -aminocaproic acid. Partial inhibition was obtained by a plasminogen fragment containing kringles 1 to 3 whereas almost no inhibition was observed with a fragment containing kringle 4. Scatchard analysis revealed a dual-phase interaction, one with a dissociation constant (kd) of 0.5 µM and the second with a kd of 7.5 µM. The estimated numbers of plasminogen molecules bound were calculated to be 110 and 790 per cell, respectively. Autoradiograms of ligand blots containing M. fermentans membrane proteins incubated with 125I-labeled plasminogen identified two plasminogen-binding proteins of about 32 and 55 kDa. The binding of plasminogen to M. fermentans enhances the activation of plasminogen to plasmin by the urokinase-type plasminogen activator (uPA), as monitored by measuring the breakdown of chromogenic substrate S-2251. Enhancement was more pronounced with the low-molecular-weight and the single-chain uPA variants, known to have low plasminogen activator activities. The binding of plasminogen also promotes the invasion of HeLa cells by M. fermentans. Invasion was more pronounced in the presence of uPA, suggesting that the ability of the organism to invade host cells stems not only from its potential to bind plasminogen but also from the activation of plasminogen to plasmin.

* Corresponding author. Mailing address: Department of Membrane and Ultrastructure Research, The Hebrew University-Hadassah Medical School, Jerusalem 91120, Israel. Phone: 972-2-6578148. Fax: 972-2-678 4010. E-mail: Rottem{at}cc.huji.ac.il.

Infection and Immunity, April 2001, p. 1977-1982, Vol. 69, No. 4
0019-9567/01/$04.00+0   DOI: 10.1128/IAI.69.4.1977-1982.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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