Assembly of basal transcription factors begins at the TATA sequence in the promoter.
The TATA box can specify transcription direction and the DNA strand that will be read. An enzyme called RNA polymerase, which produces RNA from DNA, can be attracted by proteins called transcription factors by binding to the TATA box.
The associated cap locations are lost when a TATA box is deleted. The position of the cap sites is changed by inserting 7 bp between the right TATA box and the matching cap sites, preserving as much as feasible of the original TATA box to cap sites distance.
Therefore, assembly of basal transcription factors begins at the TATA sequence in the promoter.
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