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Infection and Immunity, December 1999, p. 6487-6495, Vol. 67, No. 12
0019-9567/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Species Specificity of Plasminogen Activation and Acquisition of Surface-Associated Proteolytic Activity by Group C Streptococci Grown in Plasma

Brett Schroeder,1 Michael D. P. Boyle,2 Barbara R. Sheerin,3 Atwood C. Asbury,3 and Richard Lottenberg1,*

Division of Hematology and Oncology, Department of Medicine, University of Florida College of Medicine,1 and College of Veterinary Medicine, University of Florida,3 Gainesville, Florida 32610, and Department of Microbiology and Immunology, Medical College of Ohio, Toledo, Ohio 436142

Received 13 August 1999/Accepted 23 September 1999

Our laboratory previously demonstrated that group C streptococcal isolates from humans and horses secrete streptokinases that preferentially activate plasminogens reflecting the origin of the isolates. To analyze the significance of these findings, series of streptokinase-producing Streptococcus equisimilis isolates recovered from humans and horses were examined. Southern blot analysis revealed that chromosomal DNA of the streptococcal isolates from humans reacted exclusively with a skchu probe and that chromosomal DNA of streptococcal isolates from horses reacted preferentially with an skceq probe in a distinct pattern. The streptococcal isolates were examined for the ability to acquire surface-bound plasmin-like activity when grown in the presence of human or equine plasma. Each of eight isolates from humans acquired significant enzymatic activity only when grown in the presence of human plasma, while each of eight isolates from horses acquired activity only when grown in the presence of equine plasma. Analysis of bacterial and host protein requirements indicated critical roles for streptokinase, activatable plasminogen, and fibrinogen. These requirements may explain why certain streptococcal isolates cause disease only in a limited number of mammalian hosts.

* Corresponding author. Mailing address: Division of Hematology and Oncology, Department of Medicine, University of Florida College of Medicine, Gainesville, FL 32610-0277. Phone: (352) 392-3000. Fax: (352) 392-8530. E-mail: lottenr{at}medicine.ufl.edu.

Infection and Immunity, December 1999, p. 6487-6495, Vol. 67, No. 12
0019-9567/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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