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- PDB-1kn9: CRYSTAL STRUCTURE OF A BACTERIAL SIGNAL PEPTIDASE APO-ENZYME, IMP... -

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Basic information

Entry
Database: PDB / ID: 1kn9
TitleCRYSTAL STRUCTURE OF A BACTERIAL SIGNAL PEPTIDASE APO-ENZYME, IMPLICATIONS FOR SIGNAL PEPTIDE BINDING AND THE SER-LYS DYAD MECHANISM.
ComponentsSignal peptidase I
KeywordsHYDROLASE / serine protease / Lysine general base / membrane protein / mostly beta-fold
Function / homology
Function and homology information


signal peptidase I / signal peptide processing / protein processing / peptidase activity / endopeptidase activity / serine-type endopeptidase activity / proteolysis / plasma membrane
Similarity search - Function
Signal Peptidase I; Chain: A, domain 2 / Signal Peptidase I; Chain: A, domain 2 - #10 / Signal peptidase I, all-beta subdomain / Peptidase S26A, signal peptidase I, lysine active site / Signal peptidases I lysine active site. / Peptidase S26A, signal peptidase I / Signal peptidase, peptidase S26 / Peptidase S26A, signal peptidase I, conserved site / Signal peptidases I signature 3. / Peptidase S26A, signal peptidase I, serine active site ...Signal Peptidase I; Chain: A, domain 2 / Signal Peptidase I; Chain: A, domain 2 - #10 / Signal peptidase I, all-beta subdomain / Peptidase S26A, signal peptidase I, lysine active site / Signal peptidases I lysine active site. / Peptidase S26A, signal peptidase I / Signal peptidase, peptidase S26 / Peptidase S26A, signal peptidase I, conserved site / Signal peptidases I signature 3. / Peptidase S26A, signal peptidase I, serine active site / Signal peptidases I serine active site. / Peptidase S26 / Umud Fragment, subunit A / Umud Fragment, subunit A / LexA/Signal peptidase-like superfamily / Beta Complex / Ribbon / Mainly Beta
Similarity search - Domain/homology
Biological speciesEscherichia coli K12 (bacteria)
MethodX-RAY DIFFRACTION / SYNCHROTRON / MOLECULAR REPLACEMENT / Resolution: 2.4 Å
AuthorsPaetzel, M. / Dalbey, R.E. / Strynadka, N.C.J.
Citation
Journal: J.Biol.Chem. / Year: 2002
Title: Crystal structure of a bacterial signal peptidase apoenzyme: implications for signal peptide binding and the Ser-Lys dyad mechanism
Authors: Paetzel, M. / Dalbey, R.E. / Strynadka, N.C.J.
#1: Journal: Nature / Year: 1998
Title: Crystal structure of a bacterial signal peptidase in complex with a beta-lactam inhibitor.
Authors: Paetzel, M. / Dalbey, R.E. / Strynadka, N.C.J.
History
DepositionDec 18, 2001Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jan 30, 2002Provider: repository / Type: Initial release
Revision 1.1Apr 27, 2008Group: Version format compliance
Revision 1.2Jul 13, 2011Group: Version format compliance
Revision 1.3Oct 11, 2017Group: Refinement description / Category: software
Revision 1.4Aug 16, 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 / struct_ref_seq_dif
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession / _struct_ref_seq_dif.details

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Signal peptidase I
B: Signal peptidase I
C: Signal peptidase I
D: Signal peptidase I


Theoretical massNumber of molelcules
Total (without water)111,8674
Polymers111,8674
Non-polymers00
Water4,612256
1
A: Signal peptidase I


Theoretical massNumber of molelcules
Total (without water)27,9671
Polymers27,9671
Non-polymers00
Water181
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
2
B: Signal peptidase I


Theoretical massNumber of molelcules
Total (without water)27,9671
Polymers27,9671
Non-polymers00
Water181
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
3
C: Signal peptidase I


Theoretical massNumber of molelcules
Total (without water)27,9671
Polymers27,9671
Non-polymers00
Water181
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
4
D: Signal peptidase I


Theoretical massNumber of molelcules
Total (without water)27,9671
Polymers27,9671
Non-polymers00
Water181
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
Unit cell
Length a, b, c (Å)112.441, 112.441, 198.675
Angle α, β, γ (deg.)90.00, 90.00, 90.00
Int Tables number92
Space group name H-MP41212

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Components

#1: Protein
Signal peptidase I / / SPase I / Leader peptidase I


Mass: 27966.658 Da / Num. of mol.: 4 / Fragment: Residues 76-323, plus initiating methionine
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli K12 (bacteria) / Species: Escherichia coli / Strain: K-12 / Gene: lepB / Plasmid: pET3d / Species (production host): Escherichia coli / Production host: Escherichia coli BL21(DE3) (bacteria) / Strain (production host): BL21(DE3) / References: UniProt: P00803, signal peptidase I
#2: Water ChemComp-HOH / water / Water


Mass: 18.015 Da / Num. of mol.: 256 / Source method: isolated from a natural source / Formula: H2O

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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: 2.81 Å3/Da / Density % sol: 56.2 %
Crystal growTemperature: 295 K / Method: vapor diffusion, sitting drop / pH: 5.4
Details: ammonium dihydrogen phosphate, sodium citrate, Triton X-100, pH 5.4, VAPOR DIFFUSION, SITTING DROP, temperature 295K
Crystal grow
*PLUS
Temperature: 22 ℃ / pH: 7.4
Components of the solutions
*PLUS
IDConc.Common nameCrystal-IDSol-IDDetails
110 mg/mlprotein1drop
220 mMTris-HCl1droppH7.4
30.5 %Triton X-1001drop
40.70 Mammonium dihydrogen phosphate1reservoir
50.1 Msodium citrate1reservoirpH5.4

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Data collection

DiffractionMean temperature: 100 K
Diffraction sourceSource: SYNCHROTRON / Site: SSRL / Beamline: BL7-1 / Wavelength: 1.08 Å
DetectorType: MARRESEARCH / Detector: IMAGE PLATE / Date: Dec 8, 2000 / Details: mirrors
RadiationMonochromator: MIRRORS / Protocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray
Radiation wavelengthWavelength: 1.08 Å / Relative weight: 1
ReflectionResolution: 2.4→50 Å / Num. all: 49984 / Num. obs: 49984 / % possible obs: 98.8 % / Observed criterion σ(F): 2 / Observed criterion σ(I): 2 / Biso Wilson estimate: 39.6 Å2 / Rmerge(I) obs: 0.041 / Net I/σ(I): 25.4
Reflection shellResolution: 2.4→2.49 Å / Rmerge(I) obs: 0.296 / Mean I/σ(I) obs: 5.8 / % possible all: 100
Reflection
*PLUS
Num. measured all: 277201
Reflection shell
*PLUS
% possible obs: 100 %

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Processing

Software
NameVersionClassification
MAR345data collection
SCALEPACKdata scaling
AMoREphasing
CNS1refinement
RefinementMethod to determine structure: MOLECULAR REPLACEMENT
Starting model: PDB ENTRY 1B12

1b12


Resolution: 2.4→40.05 Å / Rfactor Rfree error: 0.006 / Data cutoff high absF: 2760295.1 / Data cutoff low absF: 0 / Isotropic thermal model: RESTRAINED / Cross valid method: THROUGHOUT / σ(F): 0 / Stereochemistry target values: Engh & Huber
RfactorNum. reflection% reflectionSelection details
Rfree0.278 2491 5 %RANDOM
Rwork0.239 ---
all0.239 49984 --
obs0.239 49920 98.7 %-
Solvent computationSolvent model: FLAT MODEL / Bsol: 42.3593 Å2 / ksol: 0.348658 e/Å3
Displacement parametersBiso mean: 45.6 Å2
Baniso -1Baniso -2Baniso -3
1-2.07 Å20 Å20 Å2
2--2.07 Å20 Å2
3----4.14 Å2
Refine analyze
FreeObs
Luzzati coordinate error0.39 Å0.31 Å
Luzzati d res low-5 Å
Luzzati sigma a0.36 Å0.25 Å
Refinement stepCycle: LAST / Resolution: 2.4→40.05 Å
ProteinNucleic acidLigandSolventTotal
Num. atoms6898 0 0 256 7154
Refine LS restraints
Refine-IDTypeDev idealDev ideal target
X-RAY DIFFRACTIONc_bond_d0.007
X-RAY DIFFRACTIONc_angle_deg1.5
X-RAY DIFFRACTIONc_dihedral_angle_d26.7
X-RAY DIFFRACTIONc_improper_angle_d0.82
X-RAY DIFFRACTIONc_mcbond_it1.711.5
X-RAY DIFFRACTIONc_mcangle_it2.712
X-RAY DIFFRACTIONc_scbond_it2.032
X-RAY DIFFRACTIONc_scangle_it3.032.5
LS refinement shellResolution: 2.4→2.55 Å / Rfactor Rfree error: 0.017 / Total num. of bins used: 6
RfactorNum. reflection% reflection
Rfree0.353 417 5.1 %
Rwork0.284 7822 -
obs--99.6 %
Xplor file
Refine-IDSerial noParam fileTopol file
X-RAY DIFFRACTION1PROTEIN_REP.PARAMPROTEIN.TOP
X-RAY DIFFRACTION2WATER_REP.PARAMWATER.TOP
X-RAY DIFFRACTION3ION.PARAMION.TOP
Software
*PLUS
Name: CNS / Version: 1 / Classification: refinement
Refinement
*PLUS
Lowest resolution: 50 Å / σ(F): 0 / % reflection Rfree: 5 %
Solvent computation
*PLUS
Displacement parameters
*PLUS
Biso mean: 45.6 Å2
Refine LS restraints
*PLUS
Refine-IDTypeDev idealDev ideal target
X-RAY DIFFRACTIONc_bond_d0.0066
X-RAY DIFFRACTIONc_angle_deg1.4524
X-RAY DIFFRACTIONc_dihedral_angle_d
X-RAY DIFFRACTIONc_dihedral_angle_deg26.7
X-RAY DIFFRACTIONc_improper_angle_d
X-RAY DIFFRACTIONc_improper_angle_deg0.82
X-RAY DIFFRACTIONc_mcbond_it1.711.5
X-RAY DIFFRACTIONc_scbond_it2.032
X-RAY DIFFRACTIONc_mcangle_it2.712
X-RAY DIFFRACTIONc_scangle_it3.032.5
LS refinement shell
*PLUS
Rfactor Rfree: 0.353 / % reflection Rfree: 5.1 % / Rfactor Rwork: 0.284

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