RT Journal Article
SR Electronic
T1 Drosophila Male-Specific Lethal-4 Protein: Structure/Function Analysis and Dependence on MSL-1 for Chromosome Association
JF Genetics
JO Genetics
FD Genetics Society of America
SP 1743
OP 1753
VO 147
IS 4
A1 Lyman, Laura M.
A1 Copps, Kyle
A1 Rastelli, Luca
A1 Kelly, Richard L.
A1 Kuroda, Mitzi I.
YR 1997
UL http://www.genetics.org/content/147/4/1743.abstract
AB MSL-2 is required for the male-specific assembly of a dosage compensation regulatory complex on the X chromosome of Drosophila melanogaster. We found that MSL-2 binds in a reproducible, partial pattern to the male Xchromosome in the absence of MLE or MSL-3, or when ectopically expressed at a low level in females. Moreover, the pattern of MSL-2 binding corresponds precisely in each case to that of MSL-1, suggesting that the two proteins function together to associate with the X. Consistent with this hypothesis, we isolated EMSinduced loss of function msl-1 and msl-2 alleles in a screen for suppressors of the toxic effects of MSL-2 expression in females. We also used sitedirected mutagenesis to determine the importance of the MSL-2 RING finger domain and second cysteine-rich motif. The mutations, including those in conserved zinc coordinating cysteines, confirm that the RING finger is essential for MSL-2 function, while suggesting a less stringent requirement for an intact second motif.