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- PDB-7cm8: High resolution crystal structure of M92A mutant of O-acetyl-L-se... -

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Basic information

Entry
Database: PDB / ID: 7cm8
TitleHigh resolution crystal structure of M92A mutant of O-acetyl-L-serine sulfhydrylase from Haemophilus influenzae
ComponentsCysteine synthase
KeywordsTRANSFERASE / Cysteine synthase / Substrate selection / mutant / Competetive allostery
Function / homology
Function and homology information


L-cysteine desulfhydrase activity / cysteine synthase / cysteine synthase activity / L-cysteine biosynthetic process from L-serine / cytoplasm
Similarity search - Function
Cysteine synthase CysK / Cysteine synthase / Cysteine synthase/cystathionine beta-synthase, pyridoxal-phosphate attachment site / Cysteine synthase/cystathionine beta-synthase P-phosphate attachment site. / : / Pyridoxal-phosphate dependent enzyme / Pyridoxal-phosphate dependent enzyme / Tryptophan synthase beta subunit-like PLP-dependent enzyme
Similarity search - Domain/homology
Biological speciesHaemophilus influenzae (bacteria)
MethodX-RAY DIFFRACTION / MOLECULAR REPLACEMENT / Resolution: 1.9 Å
AuthorsKaushik, A. / Rahisuddin, R. / Saini, N. / Kumaran, S.
CitationJournal: J.Biol.Chem. / Year: 2020
Title: Molecular mechanism of selective substrate engagement and inhibitor disengagement of cysteine synthase.
Authors: Kaushik, A. / Rahisuddin, R. / Saini, N. / Singh, R.P. / Kaur, R. / Koul, S. / Kumaran, S.
History
DepositionJul 25, 2020Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Aug 19, 2020Provider: repository / Type: Initial release
Revision 1.1Mar 3, 2021Group: Database references / Category: citation / citation_author
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_ASTM / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year
Revision 1.2Jul 7, 2021Group: Data collection / Category: pdbx_reflns_twin
Item: _pdbx_reflns_twin.crystal_id / _pdbx_reflns_twin.diffrn_id
Revision 1.3Jul 21, 2021Group: Database references / Category: citation / citation_author
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation.title / _citation_author.identifier_ORCID / _citation_author.name
Revision 1.4Nov 29, 2023Group: Data collection / Database references ...Data collection / Database references / Derived calculations / Refinement description
Category: atom_type / chem_comp_atom ...atom_type / chem_comp_atom / chem_comp_bond / database_2 / pdbx_initial_refinement_model
Item: _atom_type.pdbx_N_electrons / _atom_type.pdbx_scat_Z ..._atom_type.pdbx_N_electrons / _atom_type.pdbx_scat_Z / _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
A: Cysteine synthase
hetero molecules


Theoretical massNumber of molelcules
Total (without water)37,3517
Polymers37,1441
Non-polymers2076
Water1,38777
1
A: Cysteine synthase
hetero molecules

A: Cysteine synthase
hetero molecules


Theoretical massNumber of molelcules
Total (without water)74,70314
Polymers74,2892
Non-polymers41412
Water362
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
crystal symmetry operation6_555-x,-y,z1
Buried area5440 Å2
ΔGint-106 kcal/mol
Surface area22720 Å2
MethodPISA
Unit cell
Length a, b, c (Å)112.440, 112.440, 44.000
Angle α, β, γ (deg.)90.00, 90.00, 90.00
Int Tables number80
Space group name H-MI41

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Components

#1: Protein Cysteine synthase / CSase / O-acetylserine (thiol)-lyase / OAS-TL / O-acetylserine sulfhydrylase


Mass: 37144.273 Da / Num. of mol.: 1 / Mutation: M92A
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Haemophilus influenzae (strain ATCC 51907 / DSM 11121 / KW20 / Rd) (bacteria)
Gene: cysK, HI_1103 / Plasmid: peT28a+ PBR322
Production host: Escherichia coli 'BL21-Gold(DE3)pLysS AG' (bacteria)
References: UniProt: P45040, cysteine synthase
#2: Chemical
ChemComp-NA / SODIUM ION


Mass: 22.990 Da / Num. of mol.: 5 / Source method: obtained synthetically / Formula: Na / Feature type: SUBJECT OF INVESTIGATION
#3: Chemical ChemComp-GOL / GLYCEROL / GLYCERIN / PROPANE-1,2,3-TRIOL


Mass: 92.094 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C3H8O3 / Feature type: SUBJECT OF INVESTIGATION
#4: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 77 / Source method: obtained synthetically / 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: 1.88 Å3/Da / Density % sol: 34.7 %
Crystal growTemperature: 291 K / Method: vapor diffusion, sitting drop / pH: 7.4 / Details: 100mM HEPES buffer pH 7.4, 1.4M Sodium Citrate

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Data collection

DiffractionMean temperature: 100 K / Serial crystal experiment: N
Diffraction sourceSource: ROTATING ANODE / Type: RIGAKU MICROMAX-007 HF / Wavelength: 1.5418 Å
DetectorType: MAR scanner 345 mm plate / Detector: IMAGE PLATE / Date: Jul 7, 2020
RadiationMonochromator: M / Protocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray
Radiation wavelengthWavelength: 1.5418 Å / Relative weight: 1
Reflection twin
TypeCrystal-IDIDOperatorDomain-IDFraction
pseudo-merohedral11H, K, L10.6666
pseudo-merohedral11K, H, -L20.3334
ReflectionResolution: 1.9→39.75 Å / Num. obs: 21690 / % possible obs: 98.9 % / Redundancy: 10.2 % / Biso Wilson estimate: 21.66 Å2 / Rmerge(I) obs: 0.145 / Net I/σ(I): 9.6
Reflection shellResolution: 1.9→1.97 Å / Redundancy: 9.9 % / Rmerge(I) obs: 0.82 / Mean I/σ(I) obs: 2.7 / Num. unique obs: 1380 / % possible all: 98.6

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Processing

Software
NameVersionClassification
REFMAC5.8.0258refinement
iMOSFLMdata reduction
Aimlessdata scaling
PHASERphasing
RefinementMethod to determine structure: MOLECULAR REPLACEMENT
Starting model: 5XCP

5xcp


Resolution: 1.9→35.56 Å / Cor.coef. Fo:Fc: 0.95 / Cor.coef. Fo:Fc free: 0.943 / SU B: 4.053 / SU ML: 0.119 / Cross valid method: THROUGHOUT / ESU R: 0.028 / ESU R Free: 0.032 / Stereochemistry target values: MAXIMUM LIKELIHOOD / Details: HYDROGENS HAVE BEEN ADDED IN THE RIDING POSITIONS
RfactorNum. reflection% reflectionSelection details
Rfree0.23076 1100 5.1 %RANDOM
Rwork0.19924 ---
obs0.20087 20579 98.92 %-
Solvent computationIon probe radii: 0.8 Å / Shrinkage radii: 0.8 Å / VDW probe radii: 1.2 Å / Solvent model: MASK
Displacement parametersBiso mean: 32.031 Å2
Baniso -1Baniso -2Baniso -3
1--22.48 Å2-0 Å2-0 Å2
2---22.48 Å2-0 Å2
3---44.96 Å2
Refinement stepCycle: 1 / Resolution: 1.9→35.56 Å
ProteinNucleic acidLigandSolventTotal
Num. atoms2258 0 11 77 2346
LS refinement shellResolution: 1.9→1.95 Å / Total num. of bins used: 20
RfactorNum. reflection% reflection
Rfree0.369 80 -
Rwork0.341 1499 -
obs--98.69 %

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