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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

A Pneumocystis carinii multi-gene family with homology to subtilisin-like serine proteases.

Copies of multi-gene family, named PRT1 (protease 1), encoding a subtilisin-like serine protease were cloned from the opportunistic fungal pathogen Pneumocystis carinii. Comparison of the nucleotide sequence of a genomic clone and a cDNA clone of PRT1 from P. carinii f. sp. carinii revealed the presence of seven short introns. Several different domains were predicted from the deduced amino acid sequence: an N-terminal hydrophobic signal sequence, a pro-domain, a subtilisin-like catalytic domain, a P-domain (essential for proteolytic activity), a proline-rich domain, a serine/threonine-rich domain and a C-terminal hydrophobic domain. The catalytic domain showed high homology to other eukaryotic subtilisin-like serine proteases and possessed the three essential residues of the catalytic active site. Karyotypic analysis showed that PRT1 was a multi-gene family, copies of which were present on all but one of the P. carinii f. sp. carinii chromosomes. The different copies of the PRT1 genes showed nucleotide sequence heterogeneity, the highest level of divergence being in the proline-rich domain, which varied in both length and composition. Some copies of PRT1 were contiguous with genes encoding the P. carinii major surface glycoprotein.[1]


  1. A Pneumocystis carinii multi-gene family with homology to subtilisin-like serine proteases. Lugli, E.B., Allen, A.G., Wakefield, A.E. Microbiology (Reading, Engl.) (1997) [Pubmed]
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