Words similar to dominant-negative
Example sentences for: dominant-negative
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Previous studies have shown that Rab24 exhibits several unusual characteristics that distinguish it from other members of the Rab GTPase family [ 25 ] . The studies described in this report demonstrate that putative dominant-negative mutant forms of Rab24, bearing single amino acid substitutions in the conserved N(T)KxD nucleotide binding motif ( e.g. , D123I and T120A), are targeted to numerous inclusion bodies that disrupt the nuclear envelope and enter the nuclear compartment.
Indeed, a similar explanation has been invoked to explain the presence of Hsp70 and ubiquitin in nuclear aggregates observed in cells expressing abnormal gene products with poly-Gln tracts, such as huntingtin [ 54 ] and ataxin-1 [ 59 ] . Based on reports that overexpression of chaperones [ 59 62 ] or a dominant-negative form of the ubiquitin-conjugating enzyme [ 63 ] can suppress the formation of poly-Gln protein aggregates, Kaytor and Warren [ 58 ] proposed a three-stage model wherein (i) molecular chaperones initially associate with the misfolded protein, (ii) failure to diminish the pool of misfolded protein leads to aggregation and ubiquitination and (iii) inefficient degradation of the aggregate by the proteasome is manifested by the accumulation of inclusion bodies.
One gene in this region, slimb , is an interesting candidate because this gene encodes an F-box protein that is part of an SCF complex [ 26 ] [ 29 ] . Several independent alleles of slimb were tested and all enhanced the dominant-negative mCul1 overexpression phenotype (fig.
We attempted to distinguish between these possibilities by using an alternative strategy to make a dominant-negative form of Rab24.
Mutant molecules that inhibit the activation or function of the wildtype counterpart in the same cell have been defined as dominant-negative molecules.
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