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- PDB-6uc7: Structure of guanine riboswitch bound to N2-acetyl guanine -

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Basic information

Entry
Database: PDB / ID: 6uc7
TitleStructure of guanine riboswitch bound to N2-acetyl guanine
Componentsguanine riboswitch
KeywordsRNA / riboswitch aptamer / guanine purine nucleobase / N2-acetyl guanine
Function / homologyCOBALT HEXAMMINE(III) / N-(6-oxo-6,9-dihydro-3H-purin-2-yl)acetamide / RNA / RNA (> 10)
Function and homology information
Biological speciesBacillus subtilis (bacteria)
MethodX-RAY DIFFRACTION / MOLECULAR REPLACEMENT / Resolution: 1.798 Å
AuthorsMatyjasik, M.M. / Batey, R.T.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R01-GM073850 United States
CitationJournal: Molecules / Year: 2020
Title: High Affinity Binding of N2-Modified Guanine Derivatives Significantly Disrupts the Ligand Binding Pocket of the Guanine Riboswitch.
Authors: Matyjasik, M.M. / Hall, S.D. / Batey, R.T.
History
DepositionSep 15, 2019Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jul 22, 2020Provider: repository / Type: Initial release
Revision 1.1Oct 11, 2023Group: Data collection / Database references / Refinement description
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / database_2 / pdbx_initial_refinement_model
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
B: guanine riboswitch
hetero molecules


Theoretical massNumber of molelcules
Total (without water)22,98910
Polymers21,5071
Non-polymers1,4829
Water4,035224
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: isothermal titration calorimetry
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
MethodPISA
Unit cell
Length a, b, c (Å)132.107, 35.082, 41.606
Angle α, β, γ (deg.)90.00, 90.99, 90.00
Int Tables number5
Space group name H-MC121

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Components

#1: RNA chain guanine riboswitch


Mass: 21506.783 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) Bacillus subtilis (bacteria)
#2: Chemical
ChemComp-NCO / COBALT HEXAMMINE(III)


Mass: 161.116 Da / Num. of mol.: 8 / Source method: obtained synthetically / Formula: CoH18N6
#3: Chemical ChemComp-Q44 / N-(6-oxo-6,9-dihydro-3H-purin-2-yl)acetamide


Mass: 193.163 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C7H7N5O2 / Feature type: SUBJECT OF INVESTIGATION
#4: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 224 / Source method: isolated from a natural source / Formula: H2O
Has ligand of interestY

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Experimental details

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Experiment

ExperimentMethod: X-RAY DIFFRACTION / Number of used crystals: 1

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Sample preparation

CrystalDensity Matthews: 2.24 Å3/Da / Density % sol: 45.12 %
Crystal growTemperature: 297 K / Method: vapor diffusion, hanging drop
Details: 10 mM potassium HEPES pH 7.5, 20% v/v PEG 3000 MW, 30 mM cobalt hexamine, 600 mM ammonium acetate.

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Data collection

DiffractionMean temperature: 100 K / Serial crystal experiment: N
Diffraction sourceSource: ROTATING ANODE / Type: RIGAKU MICROMAX-007 HF / Wavelength: 1.5406 Å
DetectorType: DECTRIS PILATUS 200K / Detector: PIXEL / Date: Dec 3, 2018
RadiationMonochromator: Cu / Protocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray
Radiation wavelengthWavelength: 1.5406 Å / Relative weight: 1
ReflectionResolution: 1.798→19.74 Å / Num. obs: 16940 / % possible obs: 93.83 % / Redundancy: 3 % / Biso Wilson estimate: 19.24 Å2 / Rmerge(I) obs: 0.066 / Rrim(I) all: 0.079 / Rsym value: 0.079 / Χ2: 1.488 / Net I/σ(I): 19.3
Reflection shellResolution: 1.798→1.862 Å / Redundancy: 1.9 % / Rmerge(I) obs: 0.182 / Mean I/σ(I) obs: 3.05 / Num. unique obs: 1007 / CC1/2: 0.903 / Rpim(I) all: 0.142 / Rrim(I) all: 0.232 / Rsym value: 0.182 / Χ2: 0.711 / % possible all: 56.89

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Processing

Software
NameVersionClassification
PHENIX1.14-3260refinement
HKL-3000data reduction
HKL-3000data scaling
PHASERphasing
RefinementMethod to determine structure: MOLECULAR REPLACEMENT
Starting model: 4FE5

4fe5


Resolution: 1.798→19.74 Å / Cross valid method: FREE R-VALUE / Phase error: 22.15
RfactorNum. reflection% reflection
Rfree0.2093 3062 9.92 %
obs0.1837 16922 88.97 %
Solvent computationShrinkage radii: 0.9 Å / VDW probe radii: 1.11 Å
Refine analyzeLuzzati sigma a obs: 0.17 Å
Refinement stepCycle: LAST / Resolution: 1.798→19.74 Å
ProteinNucleic acidLigandSolventTotal
Num. atoms0 1422 70 224 1716
LS refinement shellResolution: 1.7981→1.8261 Å /
RfactorNum. reflection
Rfree0.2711 53
Rwork0.2016 455

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