The Pribnow box (also known as the Pribnow-Schaller box) is the sequence TATAAT of six nucleotides (thymine-adenine-thymine-etc.) that is an essential part of a promoter site on DNA for transcription to occur in bacteria.12 It is an idealized or consensus sequence - that is, it shows the most frequently occurring base at each position in a large number of promoters analyzed; individual promoters often vary from the consensus at one or more positions. It is also commonly called the -10 sequence, because it is centered roughly 10 base pairs upstream from the site of initiation of transcription.
The Pribnow box has a function similar to the TATA box that occurs in promoters in eukaryotes and archaea: it is recognized and bound by a subunit of RNA polymerase during initiation of transcription. This region of the DNA is also the first place where base pairs separate during prokaryotic transcription to allow access to the template strand. The AT-richness is important to allow this separation, since adenine and thymine pair together with only two hydrogen bonds (as opposed to three as with guanine and cytosine), they are easier to break apart.
Probability of occurrence of each nucleotide3
| T |
A |
T |
A |
A |
T |
| 82% |
89% |
52% |
59% |
49% |
89% |
The Pribnow box or Pribnow-Schaller box is named after David Pribnow and Heinz Schaller.
The Pribnow box is an A-T rich sequence (TATATT) located 10 bases pairs upstream from the start site for transcription. This sequence is involved in the initial recognition of the promoter by RNA polymerase.
See also
References
- ^ David Pribnow (1975). Nucleotide sequence of an RNA Polymerase Binding Site at an Early T7 Promoter. Proc. Natl. Acad. Sci. USA 72:784-788.
- ^ Heinz Schaller, Christopher Gray, and Karin Herrman (1975). Nucleotide Sequence of an RNA Polymerase Binding Site from the DNA of Bacteriophage fd. Proc. Natl. Acad. Sci. USA 72:737-741.
- ^ Calvin B. Harley and Robert P. Reynolds (1987). Analysis of E. coli promoter sequences. Nucleic Acids Res. 15(5):2343-61.
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