The shorter isoform ( deltaZip2 ) lacks the leucine zipper protein - dimerization motif .
The shorter isoform ( deltaZip2 ) does not bind to DNA , and it stimulates transcription , it is presumed , by sequestering inhibitory co-factors away from the promoter .
The shorter isoform ( deltaZip2 ) lacks the leucine zipper protein - dimerization motif and does not bind to DNA , and it stimulates transcription , it is presumed , by sequestering inhibitory co-factors away from the promoter .