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Molecular and Cellular Biology, December 2000, p. 8916-8922, Vol. 20, No. 23
Laboratory of Biochemistry and Genetics,
National Institute of Diabetes, Digestive and Kidney Diseases,
National Institutes of Health, Bethesda, Maryland 20892-0830
Received 3 July 2000/Returned for modification 29 August
2000/Accepted 11 September 2000
The [URE3] nonchromosomal genetic element is an infectious form
(prion) of the Ure2 protein, apparently a self-propagating amyloidosis.
We find that an insertion mutation or deletion of HSP104
results in inability to propagate the [URE3] prion. Our results
indicate that Hsp104 is a common factor in the maintenance of two
independent yeast prions. However, overproduction of Hsp104 does not
affect the stability of [URE3], in contrast to what is found for the
[PSI+] prion, which is known to be cured by either
overproduction or deficiency of Hsp104. Like Hsp104, the Hsp40 class
chaperone Ydj1p, with the Hsp70 class Ssa1p, can renature proteins. We
find that overproduction of Ydj1p results in a gradual complete loss of [URE3]. The involvement of protein chaperones in the propagation of
[URE3] indicates a role for protein conformation in inheritance.
0270-7306/00/$04.00+0
[URE3] Prion Propagation in Saccharomyces
cerevisiae: Requirement for Chaperone Hsp104 and Curing by
Overexpressed Chaperone Ydj1p
*
Corresponding author. Mailing address: Bldg. 8, Room
225, N.I.H., 8 Center Dr. MSC0830, Bethesda, MD 20892-0830. Phone:
(301) 496-3452. Fax: (301) 402-0240. E-mail:
wickner{at}helix.nih.gov.
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