scholarly journals Sequence-specific cleavage of double-stranded DNA caused by X-ray ionization of the platinum atom in the Pt-Bis-netropsin—DNA complex

1991 ◽  
Vol 19 (2) ◽  
pp. 257-264 ◽  
Author(s):  
S.L. Grokhovsky ◽  
V.E. Zubarev
Keyword(s):  
Platinum Atom ◽  
X Ray ◽  
Double Stranded Dna ◽  
Dna Complex

scholarly journals NMR Study of Repair Mechanism of DNA Photolyase by FAD-induced Paramagnetic Relaxation Enhancement

2004 ◽  
Vol 279 (50) ◽  
pp. 52574-52579 ◽  
Author(s):  
Takumi Ueda ◽  
Akira Kato ◽  
Yuuta Ogawa ◽  
Takuya Torizawa ◽  
Seiki Kuramitsu ◽  
...  
Keyword(s):  
Thermus Thermophilus ◽  
Paramagnetic Relaxation ◽  
Paramagnetic Relaxation Enhancement ◽  
Pyrimidine Dimer ◽  
Dna Photolyase ◽  
X Ray ◽  
Double Stranded Dna ◽  
Nmr Study ◽  
Tryptophan Residues ◽  
Dna Complex

Cyclobutane pyrimidine dimer (CPD) photolyases, which contain FAD as a cofactor, use light to repair CPDs. We performed structural analyses of the catalytic site of theThermus thermophilusCPD photolyase-DNA complex, using FAD-induced paramagnetic relaxation enhancement (PRE). The distances between the tryptophan residues and the FAD calculated from the PRE agree well with those observed in the x-ray structure (with an error of <3 Å). Subsequently, a single-stranded DNA containing13C-labeled CPD was prepared, and the FAD-induced PRE of the NMR resonances from the CPD lesion in complex with the CPD photolyase was investigated. The distance between the FAD and the CPD calculated from the PRE is 16 ± 3 Å. The FAD-induced PRE was also observed in the CPD photolyase-double-stranded DNA complex. Based on these results, a model of the CPD photolyase-DNA complex was constructed, and the roles of Arg-201, Lys-240, Trp-247, and Trp-353 in the CPD-repair reaction are discussed.

The molecular and crystal structure of [Pt(diethylenetriamine)(guanosine)](ClO4)2

1979 ◽  
Vol 57 (1) ◽  
pp. 57-61 ◽  
Author(s):  
R. Melanson ◽  
F. D. Rochon
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonding ◽  
Least Squares ◽  
Platinum Atom ◽  
X Ray Diffraction ◽  
Orthorhombic Space Group ◽  
X Ray ◽  
R Factor ◽  
Square Planar ◽  
Coordination Plane

The crystal structure of [Pt(diethylenetriamine)(guanosine)](ClO4)2 has been determined by X-ray diffraction. The crystals are orthorhombic, space group P212121, with a = 12.486(6), b = 13.444(7), c = 14.678(11) Å, and Z = 4. The structure was refined by block-diagonal least-squares analysis to a conventional R factor of 0.050 and a weighted Rw = 0.045.The coordination around the platinum atom is square planar. Guanosine is bonded to platinum through N(7). The purine planar ring makes an angle of 62.7° with the platinum coordination plane. The structure is stabilized by hydrogen bonding.

scholarly journals X-ray Structure of a NF-κB p50/RelB/DNA Complex Reveals Assembly of Multiple Dimers on Tandem κB Sites

2007 ◽  
Vol 373 (3) ◽  
pp. 723-734 ◽  
Author(s):  
Anu K. Moorthy ◽  
De-Bin Huang ◽  
Vivien Ya-Fan Wang ◽  
Don Vu ◽  
Gourisankar Ghosh
Keyword(s):  
X Ray ◽  
Dna Complex

scholarly journals Crystallization and preliminary X-ray characterization of the eukaryotic replication terminator Reb1–Ter DNA complex

2015 ◽  
Vol 71 (4) ◽  
pp. 414-418 ◽  
Author(s):  
Rahul Jaiswal ◽  
Samarendra K. Singh ◽  
Deepak Bastia ◽  
Carlos R. Escalante
Keyword(s):  
Replication Fork ◽  
Structural Information ◽  
Transcription Termination ◽  
Replication Forks ◽  
Unit Cell Parameters ◽  
X Ray ◽  
Cell Parameters ◽  
Naturally Occurring ◽  
Dna Complex

The Reb1 protein fromSchizosaccharomyces pombeis a member of a family of proteins that control programmed replication termination and/or transcription termination in eukaryotic cells. These events occur at naturally occurring replication fork barriers (RFBs), where Reb1 binds to termination (Ter) DNA sites and coordinates the polar arrest of replication forks and transcription approaching in opposite directions. The Reb1 DNA-binding and replication-termination domain was expressed inEscherichia coli, purified and crystallized in complex with a 26-mer DNA Ter site. Batch crystallization under oil was required to produce crystals of good quality for data collection. Crystals grew in space groupP21, with unit-cell parametersa= 68.9,b= 162.9,c= 71.1 Å, β = 94.7°. The crystals diffracted to a resolution of 3.0 Å. The crystals were mosaic and required two or three cycles of annealing. This study is the first to yield structural information about this important family of proteins and will provide insights into the mechanism of replication and transcription termination.

scholarly journals Incorporation of a disaccharide nucleoside into the backbone of double-stranded DNA: crystallization and preliminary X-ray diffraction

2005 ◽  
Vol 61 (10) ◽  
pp. 953-955 ◽  
Author(s):  
Kristof Van Hecke ◽  
Koen Uytterhoeven ◽  
Sergey N. Mikhailov ◽  
Piet Herdewijn ◽  
Luc Van Meervelt
Keyword(s):  
X Ray Diffraction ◽  
X Ray ◽  
Double Stranded Dna

The crystal structure of potassium trichloro(2,6-lutidine)platinum(II)

1976 ◽  
Vol 54 (6) ◽  
pp. 1002-1006 ◽  
Author(s):  
R. Melanson ◽  
F. D. Rochon
Keyword(s):  
Crystal Structure ◽  
Complex Salt ◽  
Platinum Atom ◽  
Potassium Ions ◽  
Distorted Tetrahedron ◽  
X Ray Diffraction ◽  
Full Matrix ◽  
X Ray ◽  
Salt Forms ◽  
Coordination Plane

The molecular and crystal structure of potassium trichloro(2,6-lutidine)platinum(II) has been determined by X-ray diffraction. The complex salt forms monoclinic crystals, a = 6.941, b = 24.301, c = 11.168 Å, β = 141.58°, Z = 4, and space group P21/c. Positional and anisotropic thermal parameters were refined by full matrix least squares calculations to R = 0.038 and Rw = 0.034.The coordination around the platinum atom is planar. The Pt—Cl bond lengths are 2.301, 2.299, and 2.302 Å and the Pt—N bond length is 2.011 Å. The 2,6-lutidine ring lies almost perpendicular to the coordination plane of the platinum atom (81.6°). The PtCl3 moieties are packed around the potassium ions, which are surrounded by four chlorine atoms at distances smaller than 3.15 Å forming a distorted tetrahedron.

Tetramethyld-η2-vinyldisiloxan(triphenylphosphan)platin(0) / Tetramethyldi-η2-vinyldisiloxane(triphenylphosphine)platinum(0)

1991 ◽  
Vol 46 (12) ◽  
pp. 1694-1698 ◽  
Author(s):  
Georg Beuter ◽  
Olga Heyke ◽  
Ingo-Peter Lorenz
Keyword(s):  
Crystal Structure ◽  
Chair Conformation ◽  
Ring System ◽  
Platinum Atom ◽  
X Ray Diffraction ◽  
Space Group ◽  
X Ray

The reaction of (Ph3P)2PtC2H4 with the divinyldisiloxane (CH2=CHSiMe2)2O in toluene yields Pt{(η2-H2C=CHSiMe2)2O}PPh3, which has been characterized by IR, 1H, 13C, 31P NMR and MS spectra. The crystal structure was determined by X-ray diffraction: space group C2/c, Z = 16, a = 5534.2(9), b = 842.6(2), c = 2383.1(2) pm, β = 103.73(1)°, R/Rw = 0.047/0.052. It shows a three-coordinate platinum atom with one phosphine and one sym-tetramethyldivinyldisiloxane ligand acting as a chelating bidentate η/2-ligand to give a chair conformation of the six-membered PtC2Si2O-ring system.

Crystallization and preliminary X-ray analysis of a PNA-DNA complex

FEBS Letters ◽  
1995 ◽  
Vol 363 (1-2) ◽  
pp. 115-117 ◽  
Author(s):  
Jette Sandholm Kastrup ◽  
Michael Pilgaard ◽  
Flemming Steen Jørgensen ◽  
Peter E. Nielsen ◽  
Hanne Rasmussen
Keyword(s):  
X Ray ◽  
Dna Complex

scholarly journals The Crystal Structure of the [Pt(diethylenetriamine)Br]Br Complex

1975 ◽  
Vol 53 (8) ◽  
pp. 1139-1143 ◽  
Author(s):  
Robert Melanson ◽  
Joseph Hubert ◽  
F. D. Rochon
Keyword(s):  
Crystal Structure ◽  
Least Squares ◽  
Thermal Parameters ◽  
Platinum Atom ◽  
Molecular And Crystal Structure ◽  
X Ray Diffraction ◽  
Full Matrix ◽  
Space Group ◽  
X Ray ◽  
Cell Parameters

The molecular and crystal structure of the [Pt(dien)Br]Br complex (dien = diethylenetriamine) has been studied by X-ray diffraction. The compound belongs to the orthorhombic Pca21 space group and the cell parameters are: a = 14.211, b = 4.940, c = 13.450 Å, and Z = 4. The refinement of the positional and anisotropic thermal parameters, carried out by full matrix least squares calculations, converged to R = 0.039 and Rw = 0.036.The coordination around the platinum atom is planar. The crystal consists of alternate layers of [Pt(dien)Br]+ cations and Br− ions parallel to the ac plane.

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