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Journal of Bacteriology, November 2000, p. 6222-6227, Vol. 182, No. 21
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Mapping of the Cryptococcus neoformans
MAT
Locus: Presence of Mating Type-Specific
Mitogen-Activated Protein Kinase Cascade Homologs
M.
Karos,1
Y. C.
Chang,1
C. M.
McClelland,2
D. L.
Clarke,2
J.
Fu,2
B. L.
Wickes,2 and
K. J.
Kwon-Chung1,*
Laboratory of Clinical Investigation,
National Institute of Allergy and Infectious Diseases, National
Institutes of Health, Bethesda, Maryland 20892,1
and Department of Microbiology, University of Texas Health
Science Center at San Antonio, San Antonio, Texas
78229-39002
Received 16 June 2000/Accepted 16 August 2000
In this study we investigated the relationship between the
MAT
locus of Cryptococcus neoformans and
several MAT
-specific mitogen-activated protein (MAP)
kinase signal transduction cascade genes, including
STE12
, STE11
, and STE20
.
To resolve the location of the genes, we screened a cosmid library of
the MAT
strain B-4500 (JEC21), which was chosen for the
C. neoformans genome project. We isolated several
overlapping cosmids spanning a region of about 71 kb covering the
entire MAT
locus. It was found that STE12
, STE11
, and STE20
are imbedded within the locus rather than closely linked to the locus.
Furthermore, three copies of MF
, the mating type
-pheromone gene, a MAT
-specific myosin gene, and a
pheromone receptor (CPR
) were identified within the locus. We created a physical map, based on the restriction enzyme BamHI, and identified both borders of the
MAT
locus. The MAT
locus of C. neoformans is approximately 50 kb in size and is one of the
largest mating type loci reported among fungi with a one-locus, two-allele mating system.
*
Corresponding author. Mailing address: Building 10, Room 11C304, National Institutes of Health, Bethesda, MD 20892. Phone: (301) 496-1602. Fax: (301) 402-1003. E-mail:
June_Kwon-Chung{at}NIH.GOV.
Journal of Bacteriology, November 2000, p. 6222-6227, Vol. 182, No. 21
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
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