trp- cold sensitivity
reid at HENDRIX.JCI.TJU.EDU
Mon Feb 10 18:59:22 EST 1997
Does anyone know of a cold-sensitive growth phenotype in a trp1-
strain carrying a URA3-marked CEN plasmid. I have an S288C strain that
is trp1-, his3-, ura3- and leu2-. I marked chr XV with TRP1 and
mutagenized to find conditional mutants. I am backcrossing to the same
strain background that is marked with HIS3 at the same locus on chr XV.
When I check for my phenotype at 26 and 37, I find that most of the trp-
spore products grow very slow at 26 when carrying a URA3-marked CEN
plasmid but they grow fine at 37. This slow growth is not seen on rich
or synthetic complete media. It looks like I can suppress this by
adding extra TRP to my URA dropout media, but I would like to know if
anyone has noticed a similar effect. It would help for future screens.
Thanks for your help ;)
Thomas Jefferson Univ.
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