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hsc70 is a constitutively expressed member of the hsp70 family of chaperone proteins, found in both the nuclear and cytoplasmic compartments, known to play a role in protein folding and translocation of proteins across the endoplasmic reticulum and mitochondrial membranes (11, 12).
Here, we assess the role of hsc70 in Ca M-dependent nuclear import of SRY for the first time.
Cells were imaged immediately post-bleaching with images acquired at 20-s intervals over a period of 280 s to monitor fluorescence recovery, using settings prior to photobleaching.
Significance: hsc70 may mediate nuclear transport of other developmentally important transcription factors.
Results were expressed as the fractional recovery of Fn/c (Fn/c of respective time points divided by prebleach value), and data were fitted exponentially according to the formula ½).
The initial rate was determined using results for the Fn/c between 0 and 100 s post-bleaching.
chromosome)-related high mobility group (HMG) box) proteins require the calcium-binding protein calmodulin (Ca M) for optimal nuclear accumulation, with clinical mutations in SRY that specifically impair nuclear accumulation via this pathway resulting in XY sex reversal.
However, the mechanism by which Ca M facilitates nuclear accumulation is unknown.