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Journal of Bacteriology, January 2002, p. 577-583, Vol. 184, No. 2
0021-9193/01/$04.00+0     DOI: 10.1128/JB.184.2.577-583.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Streptococcus pneumoniae Capsule Biosynthesis Protein CpsB Is a Novel Manganese-Dependent Phosphotyrosine-Protein Phosphatase

Judy K. Morona, Renato Morona, David C. Miller, and James C. Paton*

Department of Molecular Biosciences, Adelaide University, Adelaide, South Australia 5005, Australia

Received 8 August 2001/ Accepted 22 October 2001

The first four genes of the capsule locus (cps) of Streptococcus pneumoniae (cpsA to cpsD) are common to most serotypes. We have previously determined that CpsD is an autophosphorylating protein-tyrosine kinase, demonstrated that CpsC is required for CpsD tyrosine-phosphorylation, and shown that CpsB is required for dephosphorylation of CpsD. In the present study we show that CpsB is a novel manganese-dependent phosphotyrosine-protein phosphatase that belongs to the PHP (polymerase and histidinol phosphatase) family of phosphoesterases. We also show that an S. pneumoniae strain with point mutations in cpsB, affecting one of the conserved motifs of CpsB, is unencapsulated and appears to be morphologically identical to a strain in which the cpsB gene had been deleted.

* Corresponding author. Mailing address: Department of Molecular Biosciences, Adelaide University, Adelaide, SA 5005, Australia. Phone: 61-8-83035929. Fax: 61-8-83033262. E-mail: james.paton{at}adelaide.edu.au.

Journal of Bacteriology, January 2002, p. 577-583, Vol. 184, No. 2
0021-9193/01/$04.00+0     DOI: 10.1128/JB.184.2.577-583.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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