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- PDB-3bcm: Crystal Structure of The Unswapped Form of P19A/L28Q/N67D BS-RNase -

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Basic information

Database: PDB / ID: 3bcm
TitleCrystal Structure of The Unswapped Form of P19A/L28Q/N67D BS-RNase
ComponentsSeminal ribonuclease
KeywordsHYDROLASE / domain swapping / bovine seminal ribonuclease / non covalent dimer / antitumor activity / Allosteric enzyme / Endonuclease / Nuclease / Secreted
Function / homology
Function and homology information

pancreatic ribonuclease / ribonuclease A activity / RNA phosphodiester bond hydrolysis / ribonuclease activity / nucleic acid binding / lyase activity / extracellular region / identical protein binding
Similarity search - Function
P-30 Protein / Ribonuclease A-like domain / Pancreatic ribonuclease family signature. / Ribonuclease A, active site / Pancreatic ribonuclease / Pancreatic ribonuclease / Ribonuclease A-like domain superfamily / Ribonuclease A-domain / Pancreatic ribonuclease / Roll / Alpha Beta
Similarity search - Domain/homology
PHOSPHATE ION / Seminal ribonuclease
Similarity search - Component
Biological speciesBos taurus (cattle)
AuthorsMerlino, A. / Ercole, C. / Picone, D. / Pizzo, E. / Mazzarella, L. / Sica, F.
Journal: J.Mol.Biol. / Year: 2008
Title: The buried diversity of bovine seminal ribonuclease: shape and cytotoxicity of the swapped non-covalent form of the enzyme
Authors: Merlino, A. / Ercole, C. / Picone, D. / Pizzo, E. / Mazzarella, L. / Sica, F.
#1: Journal: J.Biol.Chem. / Year: 2004
Title: Structure and stability of the non-covalent swapped dimer of bovine seminal ribonuclease: an enzyme tailored to evade ribonuclease protein inhibitor
Authors: Sica, F. / Di Fiore, A. / Merlino, A. / Mazzarella, L.
#2: Journal: Acta Crystallogr.,Sect.D / Year: 1993
Title: Bovine seminal ribonuclease: structure at 1.9 A resolution
Authors: Mazzarella, L. / Capasso, S. / Demasi, D. / Di Lorenzo, G. / Mattia, C.A. / Zagari, A.
#3: Journal: Biopolymers / Year: 2004
Title: Population shift vs induced fit: the case of bovine seminal ribonuclease swapping dimer
Authors: Merlino, A. / Vitagliano, L. / Sica, F. / Zagari, A. / Mazzarella, L.
#4: Journal: Proteins / Year: 2003
Title: The unswapped chain of bovine seminal ribonuclease: Crystal structure of the free and liganded monomeric derivative
Authors: Sica, F. / Di Fiore, A. / Zagari, A. / Mazzarella, L.
#5: Journal: J.Mol.Biol. / Year: 1999
Title: A potential allosteric subsite generated by domain swapping in bovine seminal ribonuclease
Authors: Vitagliano, L. / Adinolfi, S. / Sica, F. / Merlino, A. / Zagari, A. / Mazzarella, L.
#6: Journal: Protein Sci. / Year: 1998
Title: Binding of a substrate analog to a domain swapping protein: X-ray structure of the complex of bovine seminal ribonuclease with uridylyl(2',5')adenosine
Authors: Vitagliano, L. / Adinolfi, S. / Riccio, A. / Sica, F. / Zagari, A. / Mazzarella, L.
DepositionNov 13, 2007Deposition site: RCSB / Processing site: PDBJ
Revision 1.0Feb 12, 2008Provider: repository / Type: Initial release
Revision 1.1Jul 13, 2011Group: Version format compliance
Revision 1.2Nov 10, 2021Group: Database references / Derived calculations / Category: database_2 / struct_ref_seq_dif / struct_site
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession ..._database_2.pdbx_DOI / _database_2.pdbx_database_accession / _struct_ref_seq_dif.details / _struct_site.pdbx_auth_asym_id / _struct_site.pdbx_auth_comp_id / _struct_site.pdbx_auth_seq_id

Structure visualization

Structure viewerMolecule:

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Deposited unit
A: Seminal ribonuclease
B: Seminal ribonuclease
hetero molecules

Theoretical massNumber of molelcules
Total (without water)27,6256

  • Idetical with deposited unit
  • defined by author&software
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
Buried area1380 Å2
A: Seminal ribonuclease
hetero molecules

B: Seminal ribonuclease
hetero molecules

Theoretical massNumber of molelcules
Total (without water)27,6256
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
crystal symmetry operation2_646-x+1,y-1/2,-z+11
Buried area2010 Å2
Unit cell
Length a, b, c (Å)48.513, 59.508, 49.738
Angle α, β, γ (deg.)90.00, 118.02, 90.00
Int Tables number4
Space group name H-MP1211


#1: Protein Seminal ribonuclease / Seminal RNase / S-RNase / Ribonuclease BS-1

Mass: 13622.559 Da / Num. of mol.: 2 / Mutation: P19A, L28Q, N67D
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Bos taurus (cattle) / Gene: SRN / Plasmid: PET-22B(+) / Production host: Escherichia coli (E. coli) / References: UniProt: P00669, EC:
#2: Chemical
ChemComp-PO4 / PHOSPHATE ION / Phosphate

Mass: 94.971 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: PO4
#3: Water ChemComp-HOH / water / Water

Mass: 18.015 Da / Num. of mol.: 138 / Source method: isolated from a natural source / Formula: H2O

Experimental details


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

Sample preparation

CrystalDensity Matthews: 2.33 Å3/Da / Density % sol: 47.13 %
Crystal growTemperature: 277 K / Method: vapor diffusion, sitting drop / pH: 8.4
Details: 30% methyl pentanediol, 50mM TRIS-HCl pH 8.4, 0.1M ammonium phosphate, VAPOR DIFFUSION, SITTING DROP, temperature 277K

Data collection

DiffractionMean temperature: 298 K
Diffraction sourceSource: SYNCHROTRON / Site: ELETTRA / Beamline: 5.2R / Wavelength: 1 Å
DetectorType: MAR CCD 165 mm / Detector: CCD / Date: Nov 22, 2004
RadiationMonochromator: GRAPHITE / Protocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray
Radiation wavelengthWavelength: 1 Å / Relative weight: 1
ReflectionResolution: 2.25→25 Å / Num. all: 11915 / Num. obs: 11915 / % possible obs: 99.5 % / Redundancy: 4 % / Rmerge(I) obs: 0.07 / Net I/σ(I): 22
Reflection shellResolution: 2.25→2.32 Å / Rmerge(I) obs: 0.129 / Mean I/σ(I) obs: 5 / % possible all: 97.5


MAR345dtbdata collection
HKL-2000data reduction
HKL-2000data scaling
RefinementMethod to determine structure: MOLECULAR REPLACEMENT
Starting model: PDB ENTRY 1R5D
Resolution: 2.25→20 Å / Cross valid method: THROUGHOUT / σ(F): 2 / Stereochemistry target values: Engh & Huber
RfactorNum. reflection% reflectionSelection details
Rfree0.252 1127 -RANDOM
Rwork0.183 ---
all0.224 10933 --
obs0.183 9806 99.5 %-
Refinement stepCycle: LAST / Resolution: 2.25→20 Å
ProteinNucleic acidLigandSolventTotal
Num. atoms1818 0 20 138 1976
Refine LS restraints
Refine-IDTypeDev ideal
X-RAY DIFFRACTIONc_bond_d_prot
X-RAY DIFFRACTIONc_angle_d_prot
X-RAY DIFFRACTIONc_angle_deg2.3
X-RAY DIFFRACTIONc_angle_deg_na
X-RAY DIFFRACTIONc_angle_deg_prot
X-RAY DIFFRACTIONc_dihedral_angle_d25.5
X-RAY DIFFRACTIONc_dihedral_angle_d_na
X-RAY DIFFRACTIONc_dihedral_angle_d_prot
X-RAY DIFFRACTIONc_improper_angle_d1.1
X-RAY DIFFRACTIONc_improper_angle_d_na
X-RAY DIFFRACTIONc_improper_angle_d_prot

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