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@ARTICLE{Firczuk:205697,
author = {Firczuk, M. and Wojciechowski, Marek and Czapinska,
Honorata and Bochtler, Matthias},
title = {{DNA} intercalation without flipping in the specific
{T}ha{I}-{DNA} complex},
journal = {Nucleic acids research},
volume = {39},
number = {2},
issn = {0301-5610},
address = {Oxford},
publisher = {Oxford Univ. Press},
reportid = {PUBDB-2015-00257},
pages = {744 - 754},
year = {2011},
abstract = {The PD-(D/E)XK type II restriction endonucleaseThaI cuts
the target sequence CG/CG with bluntends. Here, we report
the 1.3 Å resolution structureof the enzyme in complex
with substrate DNA and asodium or calcium ion taking the
place of a catalyticmagnesium ion. The structure identifies
Glu54,Asp82 and Lys93 as the active site residues.
Thisagrees with earlier bioinformatic predictions andimplies
that the PD and (D/E)XK motifs in thesequence are
incidental. DNA recognition is veryunusual: the two Met47
residues of the ThaI dimerintercalate symmetrically into the
CG steps of thetarget sequence. They approach the DNA from
theminor groove side and penetrate the base stackentirely.
The DNA accommodates the intercalatingresidues without
nucleotide flipping by a doubling ofthe CG step rise to
twice its usual value, which isaccompanied by drastic
unwinding. Displacementof the Met47 side chains from the
base pairmidlines toward the downstream CG steps leadsto
large and compensating tilts of the first andsecond CG
steps. DNA intercalation by ThaI isunlike intercalation by
HincII, HinP1I or proteinsthat bend or repair DNA.},
cin = {DOOR},
ddc = {570},
cid = {I:(DE-H253)HAS-User-20120731},
pnm = {DORIS Beamline BW6 (POF2-54G13)},
pid = {G:(DE-H253)POF2-BW6-20130405},
experiment = {EXP:(DE-H253)D-BW6-20150101},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000286675300037},
pubmed = {pmid:20861000},
doi = {10.1093/nar/gkq834},
url = {https://bib-pubdb1.desy.de/record/205697},
}