Words similar to hnt
Example sentences for: hnt
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These conditions did not render the cells conditionally null for Hnt2 because cells expressing HNT2 continued to limit dinucleoside polyphosphate accumulation during hours of heat shock, though at levels of ~0.
In fact, because ADE2 HNT2-His109Ala strains have high levels of dinucleoside polyphosphates and an Hnt2 polypeptide, such a strain may be sensitized to secondary mutations, whether dinucleoside polyphosphates are friend or foe [ 42 ] .
To further investigate the kinetics of heat shock and cadmium-induction of ApppN and AppppN levels, we transformed hnt2ΔADE2 strain BY71-6c with multicopy plasmids containing no HNT2 gene, the wild-type HNT2 gene, or the HNT2-His109Ala or HNT2-His109Asp alleles of HNT2 . Cultures were exposed to either 2 mM CdCl 2 or 46°C heat shock and intracellular concentrations of ApppN and AppppN were determined at 30-minute timepoints.
It had been reported that Hnt2 controls ApppN levels in vivo , with a minor effect on AppppN [ 13 ] . Here we show that the ade2 mutation present in earlier experiments prevents accumulation of ApppN and AppppN and reduced the magnitude of the Hnt2 effect.
An added benefit of these constructions is the availability of yeast strains that possess high levels of dinucleoside polyphosphates and at the same time express a mutant Fhit-homologous protein, because these are conditions which have been postulated to constitute the signaling form of Fhit [ 16 ] . Finally, using controlled genotypes we revisited conditions that lead to increased accumulation of dinucleoside polyphosphates [ 24 25 26 27 28 29 30 31 32 33 ] . Recognizing that hnt2 deletion is a pathological condition, we were particular interested in identifying conditions that lead to accumulation of such compounds in cells that contain a functional HNT2 gene, rather than simply identifying conditions that produce diadenosine polyphosphate accumulation in the absence of Hnt2.
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