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- PDB-2cxg: CYCLODEXTRIN GLYCOSYLTRANSFERASE COMPLEXED TO THE INHIBITOR ACARBOSE -

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Basic information

Entry
Database: PDB / ID: 2cxg
TitleCYCLODEXTRIN GLYCOSYLTRANSFERASE COMPLEXED TO THE INHIBITOR ACARBOSE
ComponentsCYCLODEXTRIN GLYCOSYLTRANSFERASE
KeywordsGLYCOSYLTRANSFERASE
Function / homology
Function and homology information


cyclomaltodextrin glucanotransferase / cyclomaltodextrin glucanotransferase activity / starch binding / alpha-amylase activity / carbohydrate metabolic process / extracellular region / metal ion binding
Similarity search - Function
Carbohydrate binding module family 20 / Starch binding domain / CBM20 (carbohydrate binding type-20) domain profile. / Starch binding domain / Carbohydrate-binding-like fold / Alpha-amylase, C-terminal domain / Aamy_C / Alpha-amylase/branching enzyme, C-terminal all beta / Alpha amylase, C-terminal all-beta domain / Alpha amylase ...Carbohydrate binding module family 20 / Starch binding domain / CBM20 (carbohydrate binding type-20) domain profile. / Starch binding domain / Carbohydrate-binding-like fold / Alpha-amylase, C-terminal domain / Aamy_C / Alpha-amylase/branching enzyme, C-terminal all beta / Alpha amylase, C-terminal all-beta domain / Alpha amylase / IPT/TIG domain / IPT domain / Alpha amylase, catalytic domain / Glycosyl hydrolase, family 13, catalytic domain / Alpha-amylase domain / Golgi alpha-mannosidase II / Glycosyl hydrolase, all-beta / Glycosidases / Immunoglobulin E-set / Glycoside hydrolase superfamily / Immunoglobulins / TIM Barrel / Alpha-Beta Barrel / Immunoglobulin-like fold / Immunoglobulin-like / Sandwich / Mainly Beta / Alpha Beta
Similarity search - Domain/homology
alpha-maltose / alpha-maltotetraose / Chem-ACI / alpha-D-glucopyranose / Cyclomaltodextrin glucanotransferase
Similarity search - Component
Biological speciesBacillus circulans (bacteria)
MethodX-RAY DIFFRACTION / MOLECULAR REPLACEMENT / Resolution: 2.5 Å
AuthorsStrokopytov, B.V. / Uitdehaag, J.C.M. / Ruiterkamp, R. / Dijkstra, B.W.
Citation
Journal: Biochemistry / Year: 1995
Title: X-ray structure of cyclodextrin glycosyltransferase complexed with acarbose. Implications for the catalytic mechanism of glycosidases.
Authors: Strokopytov, B. / Penninga, D. / Rozeboom, H.J. / Kalk, K.H. / Dijkhuizen, L. / Dijkstra, B.W.
#1: Journal: Biochemistry / Year: 1998
Title: Reassessment of Acarbose as a Transition State Analogue Inhibitor of Cyclodextrin Glycosyltransferase
Authors: Mosi, R. / Sham, H. / Uitdehaag, J.C.M. / Ruiterkamp, R. / Dijkstra, B.W. / Withers, S.G.
#2: Journal: J.Mol.Biol. / Year: 1994
Title: Nucleotide Sequence and X-Ray Structure of Cyclodextrin Glycosyltransferase from Bacillus Circulans Strain 251 in a Maltose-Dependent Crystal Form
Authors: Lawson, C.L. / Van Montfort, R. / Strokopytov, B. / Rozeboom, H.J. / Kalk, K.H. / De Vries, G.E. / Penninga, D. / Dijkhuizen, L. / Dijkstra, B.W.
#3: Journal: J.Mol.Biol. / Year: 1990
Title: Maltodextrin-Dependent Crystallization of Cyclomaltodextrin Glucanotransferase from Bacillus Circulans
Authors: Lawson, C.L. / Bergsma, J. / Bruinenberg, P.M. / De Vries, G. / Dijkhuizen, L. / Dijkstra, B.W.
History
DepositionMay 8, 1998Processing site: BNL
SupersessionOct 14, 1998ID: 1CXG
Revision 1.0Oct 14, 1998Provider: repository / Type: Initial release
Revision 1.1Mar 24, 2008Group: Version format compliance
Revision 1.2Jul 13, 2011Group: Version format compliance
Revision 2.0Oct 25, 2017Group: Atomic model / Derived calculations / Structure summary
Category: atom_site / struct_conn
Item: _atom_site.auth_atom_id / _atom_site.label_atom_id ..._atom_site.auth_atom_id / _atom_site.label_atom_id / _chem_comp.pdbx_synonyms / _struct_conn.ptnr1_label_atom_id
Revision 2.1Apr 18, 2018Group: Data collection / Category: diffrn_detector / Item: _diffrn_detector.detector
Revision 3.0Jul 29, 2020Group: Atomic model / Data collection ...Atomic model / Data collection / Derived calculations / Structure summary
Category: atom_site / chem_comp ...atom_site / chem_comp / entity / entity_name_com / pdbx_branch_scheme / pdbx_chem_comp_identifier / pdbx_entity_branch / pdbx_entity_branch_descriptor / pdbx_entity_branch_link / pdbx_entity_branch_list / pdbx_entity_nonpoly / pdbx_molecule_features / pdbx_nonpoly_scheme / pdbx_struct_assembly_gen / pdbx_struct_conn_angle / struct_asym / struct_conn / struct_conn_type / struct_site / struct_site_gen
Item: _atom_site.B_iso_or_equiv / _atom_site.Cartn_x ..._atom_site.B_iso_or_equiv / _atom_site.Cartn_x / _atom_site.Cartn_y / _atom_site.Cartn_z / _atom_site.auth_asym_id / _atom_site.auth_atom_id / _atom_site.auth_comp_id / _atom_site.auth_seq_id / _atom_site.label_asym_id / _atom_site.label_atom_id / _atom_site.label_comp_id / _atom_site.label_entity_id / _atom_site.type_symbol / _chem_comp.name / _chem_comp.type / _pdbx_struct_assembly_gen.asym_id_list / _pdbx_struct_conn_angle.ptnr1_auth_comp_id / _pdbx_struct_conn_angle.ptnr1_auth_seq_id / _pdbx_struct_conn_angle.ptnr1_label_asym_id / _pdbx_struct_conn_angle.ptnr1_label_atom_id / _pdbx_struct_conn_angle.ptnr1_label_comp_id / _pdbx_struct_conn_angle.ptnr1_label_seq_id / _pdbx_struct_conn_angle.ptnr2_label_asym_id / _pdbx_struct_conn_angle.ptnr3_auth_comp_id / _pdbx_struct_conn_angle.ptnr3_auth_seq_id / _pdbx_struct_conn_angle.ptnr3_label_asym_id / _pdbx_struct_conn_angle.ptnr3_label_atom_id / _pdbx_struct_conn_angle.ptnr3_label_comp_id / _pdbx_struct_conn_angle.ptnr3_label_seq_id / _pdbx_struct_conn_angle.value / _struct_conn.conn_type_id / _struct_conn.id / _struct_conn.pdbx_dist_value / _struct_conn.pdbx_leaving_atom_flag / _struct_conn.pdbx_value_order / _struct_conn.ptnr1_auth_asym_id / _struct_conn.ptnr1_auth_comp_id / _struct_conn.ptnr1_auth_seq_id / _struct_conn.ptnr1_label_asym_id / _struct_conn.ptnr1_label_atom_id / _struct_conn.ptnr1_label_comp_id / _struct_conn.ptnr1_label_seq_id / _struct_conn.ptnr2_auth_asym_id / _struct_conn.ptnr2_auth_comp_id / _struct_conn.ptnr2_auth_seq_id / _struct_conn.ptnr2_label_asym_id / _struct_conn.ptnr2_label_atom_id / _struct_conn.ptnr2_label_comp_id / _struct_conn.ptnr2_label_seq_id / _struct_conn_type.id
Description: Carbohydrate remediation / Provider: repository / Type: Remediation
Revision 3.1Aug 9, 2023Group: Database references / Refinement description / Structure summary
Category: chem_comp / database_2 / pdbx_initial_refinement_model
Item: _chem_comp.pdbx_synonyms / _database_2.pdbx_DOI / _database_2.pdbx_database_accession

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: CYCLODEXTRIN GLYCOSYLTRANSFERASE
hetero molecules


Theoretical massNumber of molelcules
Total (without water)76,6889
Polymers74,5751
Non-polymers2,1138
Water1,65792
1


  • Idetical with deposited unit
  • defined by author
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
Unit cell
Length a, b, c (Å)120.887, 111.903, 65.748
Angle α, β, γ (deg.)90.00, 90.00, 90.00
Int Tables number19
Space group name H-MP212121

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Components

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Protein , 1 types, 1 molecules A

#1: Protein CYCLODEXTRIN GLYCOSYLTRANSFERASE / CGTASE


Mass: 74575.484 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Details: COMPLEXED TO AN ACARBOSE-DERIVED MALTOTETRAOSE INHIBITOR
Source: (natural) Bacillus circulans (bacteria) / Strain: 251
References: UniProt: P43379, cyclomaltodextrin glucanotransferase

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Sugars , 4 types, 5 molecules

#2: Polysaccharide alpha-D-glucopyranose-(1-4)-alpha-D-glucopyranose / alpha-maltose


Type: oligosaccharide, Oligosaccharide / Class: Nutrient / Mass: 342.297 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Details: oligosaccharide / References: alpha-maltose
DescriptorTypeProgram
DGlcpa1-4DGlcpa1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/1,2,1/[a2122h-1a_1-5]/1-1/a4-b1WURCSPDB2Glycan 1.1.0
[][a-D-Glcp]{[(4+1)][a-D-Glcp]{}}LINUCSPDB-CARE
#3: Polysaccharide alpha-D-quinovopyranose-(1-4)-alpha-D-glucopyranose


Type: oligosaccharide / Mass: 326.297 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DQuipa1-4DGlcpa1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/2,2,1/[a2122h-1a_1-5][a2122m-1a_1-5]/1-2/a4-b1WURCSPDB2Glycan 1.1.0
[][a-D-Glcp]{[(4+1)][a-D-4,6-deoxy-Glcp]{}}LINUCSPDB-CARE
#4: Polysaccharide alpha-D-glucopyranose-(1-4)-alpha-D-glucopyranose-(1-4)-alpha-D-glucopyranose-(1-4)-alpha-D-glucopyranose / alpha-maltotetraose


Type: oligosaccharide, Oligosaccharide / Class: Substrate analog / Mass: 666.578 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Details: oligosaccharide / References: alpha-maltotetraose
DescriptorTypeProgram
DGlcpa1-4DGlcpa1-4DGlcpa1-4DGlcpa1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/1,4,3/[a2122h-1a_1-5]/1-1-1-1/a4-b1_b4-c1_c4-d1WURCSPDB2Glycan 1.1.0
[][a-D-Glcp]{[(4+1)][a-D-Glcp]{[(4+1)][a-D-Glcp]{[(4+1)][a-D-Glcp]{}}}}LINUCSPDB-CARE
#6: Sugar ChemComp-GLC / alpha-D-glucopyranose / alpha-D-glucose / D-glucose / glucose / Glucose


Type: D-saccharide, alpha linking / Mass: 180.156 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Formula: C6H12O6
IdentifierTypeProgram
DGlcpaCONDENSED IUPAC CARBOHYDRATE SYMBOLGMML 1.0
a-D-glucopyranoseCOMMON NAMEGMML 1.0
a-D-GlcpIUPAC CARBOHYDRATE SYMBOLPDB-CARE 1.0
GlcSNFG CARBOHYDRATE SYMBOLGMML 1.0

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Non-polymers , 3 types, 95 molecules

#5: Chemical ChemComp-ACI / 6-AMINO-4-HYDROXYMETHYL-CYCLOHEX-4-ENE-1,2,3-TRIOL / Valienamine


Mass: 175.182 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Formula: C7H13NO4 / Comment: antibiotic*YM
#7: Chemical ChemComp-CA / CALCIUM ION


Mass: 40.078 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: Ca
#8: Water ChemComp-HOH / water / Water


Mass: 18.015 Da / Num. of mol.: 92 / 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: 2.9 Å3/Da / Density % sol: 59 %
Crystal growpH: 7.55
Details: PROTEIN WAS CRYSTALLIZED FROM OTHER LIQUOR CONTAINING 60% V/V METHYL-PENTANEDIOL (MPD) 100 MM SODIUM-HEPES PH 7.55 AND 0.5% W/V MALTOSE THEN SOAKED IN MOTHER LIQUOR WITH 0.1 % ACARBOSE AND 0. ...Details: PROTEIN WAS CRYSTALLIZED FROM OTHER LIQUOR CONTAINING 60% V/V METHYL-PENTANEDIOL (MPD) 100 MM SODIUM-HEPES PH 7.55 AND 0.5% W/V MALTOSE THEN SOAKED IN MOTHER LIQUOR WITH 0.1 % ACARBOSE AND 0.5 % MALTOSE FOR 5 DAYS
Crystal grow
*PLUS
pH: 5.5 / Method: vapor diffusion
Components of the solutions
*PLUS
IDConc.Common nameCrystal-IDSol-ID
128.7 mg/mlprotein1drop
250 mMammonium acetate1drop
350 mg/mlalpha-cyclodextrin1drop
460 %(v/v)MPD1reservoir
5100 mMsodium Hepes1reservoir

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Data collection

DiffractionMean temperature: 293 K
Diffraction sourceSource: ROTATING ANODE / Type: ELLIOTT GX-21 / Wavelength: 1.5418
DetectorType: ENRAF-NONIUS FAST / Detector: DIFFRACTOMETER / Date: Jun 1, 1992
RadiationMonochromator: GRAPHITE(002) / Monochromatic (M) / Laue (L): M / Scattering type: x-ray
Radiation wavelengthWavelength: 1.5418 Å / Relative weight: 1
ReflectionResolution: 2.5→29 Å / Num. obs: 59552 / % possible obs: 73.9 % / Observed criterion σ(I): 0 / Redundancy: 2.42 % / Biso Wilson estimate: 14.7 Å2 / Rmerge(I) obs: 0.086 / Rsym value: 0.086
Reflection shellResolution: 2.5→2.58 Å / % possible all: 40.3
Reflection shell
*PLUS
% possible obs: 40.3 %

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Processing

Software
NameClassification
MADNESdata collection
BIOMOLdata reduction
TNTrefinement
MADNESdata reduction
BIOMOLdata scaling
TNTphasing
RefinementMethod to determine structure: MOLECULAR REPLACEMENT
Starting model: 1CDG

1cdg


Resolution: 2.5→8 Å / Isotropic thermal model: TNT BCORREL / Cross valid method: R FREE / σ(F): 0 / Stereochemistry target values: TNT PROTGEO
Details: IDEAL PARAMETERS FOR GLUCOSE FROM TAKUSAGAWA & JACOBSON (1978), ACTA CRYST. B34: 213-218, FOR ACARBOSE FROM STROKOPYTOV ET AL. (1995) BIOCHEMISTRY 34:2234-2240
RfactorNum. reflection% reflectionSelection details
Rfree0.23 2148 10.7 %EVERY 10TH REFLECTION
Rwork0.182 ---
all0.187 23325 --
obs0.187 22281 73 %-
Solvent computationSolvent model: BABINET SCALING / Bsol: 248.5 Å2 / ksol: 0.891 e/Å3
Refinement stepCycle: LAST / Resolution: 2.5→8 Å
ProteinNucleic acidLigandSolventTotal
Num. atoms5264 0 137 92 5493
Refine LS restraints
Refine-IDTypeDev idealNumberWeight
X-RAY DIFFRACTIONt_bond_d0.00455385
X-RAY DIFFRACTIONt_angle_deg1.147753812
X-RAY DIFFRACTIONt_dihedral_angle_d18.24531320
X-RAY DIFFRACTIONt_incorr_chiral_ct0
X-RAY DIFFRACTIONt_pseud_angle
X-RAY DIFFRACTIONt_trig_c_planes0.0041478
X-RAY DIFFRACTIONt_gen_planes0.00779630
X-RAY DIFFRACTIONt_it1.286553510
X-RAY DIFFRACTIONt_nbd0.00917880
Software
*PLUS
Name: TNT / Version: 5D / Classification: refinement
Refinement
*PLUS
Solvent computation
*PLUS
Displacement parameters
*PLUS
Biso mean: 20.7 Å2
Refine LS restraints
*PLUS
Type: t_plane_restr / Dev ideal: 0.007 / Weight: 30

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