391D

STRUCTURAL VARIABILITY AND NEW INTERMOLECULAR INTERACTIONS OF Z-DNA IN CRYSTALS OF D(PCPGPCPGPCPG)

Summary for 391D

• Entry DOI: 10.2210/pdb391d/pdb
• Descriptor: DNA (5'-D(P*CP*GP*CP*GP*CP*G)-3') (2 entities in total)
• Functional Keywords: z-dna, double helix, dna
• Total number of polymer chains: 6
• Total formula weight: 10861.23

Authors

Malinina, L.,Tereshko, V.,Ivanova, E.,Subirana, J.A.,Zarytova, V.,Nekrasov, Y. (deposition date: 1998-04-20, release date: 1998-05-05, Last modification date: 2024-02-21)

Primary citation

Malinina, L.,Tereshko, V.,Ivanova, E.,Subirana, J.A.,Zarytova, V.,Nekrasov, Y.
Structural variability and new intermolecular interactions of Z-DNA in crystals of d(pCpGpCpGpCpG).
Biophys.J., 74:2482-2490, 1998

PubMed Abstract: We have determined the single crystal x-ray structure of the synthetic DNA hexamer d(pCpGpCpGpCpG) in two different crystal forms. The hexamer pCGCGCG has the Z-DNA conformation and in both cases the asymmetric unit contains more than one Z-DNA duplex. Crystals belong to the space group C222(1) with a = 69.73, b = 52.63, and c = 26.21 A, and to the space group P2(1) with a = 49.87, b = 41.26, c = 21.91 A, and gamma = 97.12 degrees. Both crystals show new crystal packing modes. The molecules also show striking new features when compared with previously determined Z-DNA structures: 1) the bases in one duplex have a large inclination with respect to the helical axis, which alters the overall shape of the molecule. 2) Some cytosine nitrogens interact by hydrogen bonding with phosphates in neighbor molecules. Similar base-phosphate interactions had been previously detected in some B-DNA crystals. 3) Basepair stacking between the ends of neighbor molecules is variable and no helical continuity is maintained between contiguous hexamer duplexes.

PubMed: 9591674

Experimental method

X-RAY DIFFRACTION (2.75 Å)