1RSB

X-ray study of the DNA oligomer d(ATATAT) in P65 space group

Summary for 1RSB

• Entry DOI: 10.2210/pdb1rsb/pdb
• Descriptor: 5'-D(*AP*TP*AP*TP*AP*T)-3' (2 entities in total)
• Functional Keywords: antiparallel hoogsteen dna, dna
• Total number of polymer chains: 4
• Total formula weight: 7228.96

Authors

Abrescia, N.G.,Gonzalez, C.,Gouyette, C.,Subirana, J.A. (deposition date: 2003-12-09, release date: 2004-05-25, Last modification date: 2024-02-14)

Primary citation

Abrescia, N.G.,Gonzalez, C.,Gouyette, C.,Subirana, J.A.
X-ray and NMR studies of the DNA oligomer d(ATATAT): Hoogsteen base pairing in duplex DNA.
Biochemistry, 43:4092-4100, 2004

PubMed Abstract: We present and analyze the structure of the oligonucleotide d(ATATAT) found in two different forms by X-ray crystallography and in solution by NMR. We find that in both crystal lattices the oligonucleotide forms an antiparallel double helical duplex in which base pairing is of the Hoogsteen type. The double helix is apparently very similar to the standard B-form of DNA, with about 10 base pairs per turn. However, the adenines in the duplex are flipped over; as a result, the physicochemical features of both grooves of the helix are changed. In particular, the minor groove is narrow and hydrophobic. On the other hand, d(ATATAT) displays a propensity to adopt the B conformation in solution. These results confirm the polymorphism of AT-rich sequences in DNA. Furthermore, we show that extrahelical adenines and thymines can be minor groove binders in Hoogsteen DNA.

PubMed: 15065851
DOI: 10.1021/bi0355140

Experimental method

X-RAY DIFFRACTION (2.17 Å)