Nucleic Acids Research, Vol 24, Issue 14 2767-2773, Copyright © 1996 by Oxford University Press
M Suzuki, MD Allen, N Yagi and JT Finch
Possible stereochemical determinants of the orientation of TBP on the TATA
box are discussed using the crystal coordinates of TBP-TATA complexes,
which have been determined by other groups. The C-terminal half of the TBP
beta-sheet interacts with the TATA site of the DNA, and the N-terminal half
with the A-rich site, so that the two sites with distinct curvatures
produce a unique fit. Although chemical contacts take place between one
side of the beta-sheet and the DNA minor groove, the interaction seems to
be facilitated indirectly by the characteristics of the other side of the
beta-sheet and the DNA major groove. Thus, Ala71, Leu162 and Pro190
differentiate the curvature of the beta-sheet in the N- and C-halves. The
methyl positions in the DNA major groove modulate the bendability of the
two DNA sites by using differences in the rolling capacity of TA and AT
compared with PyT, and in the shifting capacity of AT compared with TT. The
deformations of the first steps (TA and PyT) in the two sites are the
largest and thus are important for the overall bending of the DNA. The
differences between the two DNA sites are greatest at the second steps (AT
and TT) and so these are important for determining the orientation of TBP.
ARTICLES
Analysis of co-crystal structures to identify the stereochemical determinants of the orientation of TBP on the TATA box
AIST-NIBHT Structural Biology Centre, Tsukuba, Japan.
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