Two Sequences of a Prokaryotic Promoter Are Shown Below $\quad\quad\quad\quad\quad\quad\quad$ Sequence 2

Two sequences of a prokaryotic promoter are shown below. Sequence 1 is the wild-type sequence, and sequence 2 is a mutant sequence (mutation shown in bold) that results in increased transcription of the gene. Explain why sequence 2 shows this phenotype. Sequence 1 $\quad\quad\quad\quad\quad\quad\quad$ Sequence 2
$- 10$$\quad\quad\quad\quad\quad\quad\quad\quad\quad$$- 10$
...CGAATAATGAA... $\quad\quad$ ...CGTATAATGAA...