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Infect. Immun., Jun 1996, 1977-1983, Vol 64, No. 6
YC Chang, LA Penoyer and KJ Kwon-Chung
The extracellular polysaccharide capsule produced by Cryptococcus
neoformans is essential for its pathogenicity. We have isolated and
characterized a gene, (AP64, which is required for capsule formation. An
encapsulated strain created by complementation of the cap64 mutation
produced fatal infection of mice within 25 days, while the cap64 acapsular
strain was avirulent. Gene deletion of CAP64 from a wild-type strain
resulted in the loss of capsule as well as virulence. Contour- clamped
homogeneous electric field gel analysis indicates that CAP64 is located on
chromosome III which is different from the localization of another
capsule-related gene, CAP59. The nonlinkage between CAP64 and CAP59 was
also supported by classical recombinational analysis. Database searches did
not reveal any sequence with high similarity to CAP64. We also found that
the CAP64 locus is contiguous to a convergently transcribed gene which has
significant similarity to the gene encoding the yeast proteasome subunit,
PRE1. The distance between the cDNA ends of these two genes is only 22 bp.
This study confirms the previous molecular genetic evidence that capsule is
an essential factor for the virulence of C. neoformans in the murine model.
Copyright © 1996, American Society for Microbiology
The second capsule gene of cryptococcus neoformans, CAP64, is essential for virulence
Laboratory of Clinical Investigation, National Institute of Allergy and Infectious Diseases, Bethesda, Maryland 20892, USA.
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