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- PDB-1nm9: Crystal structure of recombinant human salivary amylase mutant W58A -

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Basic information

Entry
Database: PDB / ID: 1nm9
TitleCrystal structure of recombinant human salivary amylase mutant W58A
ComponentsAlpha-amylase, salivary
KeywordsHYDROLASE / C-H... hydrogen bond / tim barrel / catalysis
Function / homology
Function and homology information


Digestion of dietary carbohydrate / oligosaccharide metabolic process / alpha-amylase / alpha-amylase activity / chloride ion binding / carbohydrate metabolic process / calcium ion binding / extracellular space / extracellular exosome
Similarity search - Function
Alpha-amylase, C-terminal domain / Aamy_C / Alpha-amylase/branching enzyme, C-terminal all beta / Alpha amylase, C-terminal all-beta domain / Alpha amylase / Alpha amylase, catalytic domain / Glycosyl hydrolase, family 13, catalytic domain / Alpha-amylase domain / Golgi alpha-mannosidase II / Glycosyl hydrolase, all-beta ...Alpha-amylase, C-terminal domain / Aamy_C / Alpha-amylase/branching enzyme, C-terminal all beta / Alpha amylase, C-terminal all-beta domain / Alpha amylase / Alpha amylase, catalytic domain / Glycosyl hydrolase, family 13, catalytic domain / Alpha-amylase domain / Golgi alpha-mannosidase II / Glycosyl hydrolase, all-beta / Glycosidases / Glycoside hydrolase superfamily / TIM Barrel / Alpha-Beta Barrel / Immunoglobulin-like / Sandwich / Mainly Beta / Alpha Beta
Similarity search - Domain/homology
alpha-D-glucopyranose / 5-HYDROXYMETHYL-CHONDURITOL / Alpha-amylase 1B / Alpha-amylase 1C
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodX-RAY DIFFRACTION / MOLECULAR REPLACEMENT / Resolution: 2.1 Å
AuthorsRamasubbu, N. / Ragunath, C. / Mishra, P.J. / Thomas, L.M.
CitationJournal: Eur.J.Biochem. / Year: 2004
Title: Human salivary alpha-amylase Trp58 situated at subsite -2 is critical for enzyme activity.
Authors: Ramasubbu, N. / Ragunath, C. / Mishra, P.J. / Thomas, L.M. / Kandra, L.
History
DepositionJan 9, 2003Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jan 20, 2004Provider: repository / Type: Initial release
Revision 1.1Apr 29, 2008Group: Version format compliance
Revision 1.2Jul 13, 2011Group: Version format compliance
Revision 2.0Dec 25, 2019Group: Advisory / Data collection ...Advisory / Data collection / Database references / Derived calculations / Polymer sequence
Category: chem_comp / entity_poly ...chem_comp / entity_poly / pdbx_struct_mod_residue / pdbx_unobs_or_zero_occ_atoms / struct_conn / struct_ref_seq_dif
Item: _chem_comp.type / _entity_poly.pdbx_seq_one_letter_code_can ..._chem_comp.type / _entity_poly.pdbx_seq_one_letter_code_can / _pdbx_struct_mod_residue.parent_comp_id / _pdbx_unobs_or_zero_occ_atoms.label_asym_id / _struct_conn.pdbx_leaving_atom_flag
Revision 3.0Jul 29, 2020Group: Advisory / Atomic model ...Advisory / Atomic model / Data collection / Derived calculations / Structure summary
Category: atom_site / chem_comp ...atom_site / chem_comp / entity / 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_nonpoly_scheme / pdbx_struct_assembly_gen / pdbx_struct_conn_angle / pdbx_unobs_or_zero_occ_atoms / struct_asym / struct_conn / 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 / _entity.formula_weight / _entity.pdbx_description / _entity.pdbx_number_of_molecules / _entity.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 / _pdbx_unobs_or_zero_occ_atoms.auth_asym_id / _pdbx_unobs_or_zero_occ_atoms.auth_seq_id / _pdbx_unobs_or_zero_occ_atoms.label_asym_id / _pdbx_unobs_or_zero_occ_atoms.label_seq_id / _struct_conn.pdbx_dist_value / _struct_conn.pdbx_leaving_atom_flag / _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
Description: Carbohydrate remediation / Provider: repository / Type: Remediation
Revision 3.1Oct 27, 2021Group: Database references / Derived calculations / Structure summary
Category: chem_comp / database_2 ...chem_comp / database_2 / struct_conn / struct_ref_seq_dif
Item: _chem_comp.pdbx_synonyms / _database_2.pdbx_DOI ..._chem_comp.pdbx_synonyms / _database_2.pdbx_DOI / _database_2.pdbx_database_accession / _struct_conn.pdbx_leaving_atom_flag / _struct_ref_seq_dif.details
Revision 3.2Aug 16, 2023Group: Data collection / Refinement description
Category: chem_comp_atom / chem_comp_bond / pdbx_initial_refinement_model
Revision 3.3Nov 6, 2024Group: Structure summary / Category: pdbx_entry_details / pdbx_modification_feature

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Alpha-amylase, salivary
hetero molecules


Theoretical massNumber of molelcules
Total (without water)56,9237
Polymers55,8401
Non-polymers1,0826
Water4,594255
1


  • Idetical with deposited unit
  • defined by author
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
Unit cell
Length a, b, c (Å)51.946, 74.060, 134.508
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 Alpha-amylase, salivary / 1 / 4-alpha-D-glucan glucanohydrolase


Mass: 55840.125 Da / Num. of mol.: 1 / Mutation: W58A
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Cell line (production host): sf9 / Production host: Spodoptera frugiperda (fall armyworm)
References: UniProt: P04745, UniProt: P0DTE8*PLUS, alpha-amylase

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Sugars , 2 types, 3 molecules

#2: Polysaccharide 4-amino-4,6-dideoxy-alpha-D-glucopyranose-(1-4)-alpha-D-glucopyranose


Type: oligosaccharide / Mass: 325.313 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DQuip[4N]a1-4DGlcpa1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/2,2,1/[a2122h-1a_1-5][a2122m-1a_1-5_4*N]/1-2/a4-b1WURCSPDB2Glycan 1.1.0
[][a-D-Glcp]{[(4+1)][a-D-6-deoxy-Glcp4N]{}}LINUCSPDB-CARE
#4: Sugar ChemComp-GLC / alpha-D-glucopyranose / alpha-D-glucose / D-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 , 4 types, 258 molecules

#3: Chemical ChemComp-HMC / 5-HYDROXYMETHYL-CHONDURITOL


Mass: 176.167 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Formula: C7H12O5
#5: Chemical ChemComp-CA / CALCIUM ION


Mass: 40.078 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Ca
#6: Chemical ChemComp-CL / CHLORIDE ION


Mass: 35.453 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Cl
#7: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 255 / Source method: isolated from a natural source / Formula: H2O

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Details

Has protein modificationY

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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: 2.17 Å3/Da / Density % sol: 42.85 %
Crystal growTemperature: 323 K / Method: vapor diffusion, hanging drop / pH: 9
Details: MPD, Calcium chloride, pH 9.0, VAPOR DIFFUSION, HANGING DROP, temperature 323K
Crystal grow
*PLUS
Method: vapor diffusion, hanging drop
Components of the solutions
*PLUS
IDConc.Common nameCrystal-IDSol-IDDetailsChemical formula
116 mg/mlprotein1drop
210 mMTris-HCl1droppH9.0
35 mM1dropCaCl2
440 %MPD1reservoir

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Data collection

DiffractionMean temperature: 100 K
Diffraction sourceSource: ROTATING ANODE / Type: RIGAKU RU200 / Wavelength: 1.5418 Å
DetectorType: RIGAKU RAXIS IV / Detector: IMAGE PLATE / Date: Sep 1, 2002 / Details: mirrors
RadiationMonochromator: osmic mirrors / Protocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray
Radiation wavelengthWavelength: 1.5418 Å / Relative weight: 1
ReflectionResolution: 2.1→42.6 Å / Num. obs: 31104 / % possible obs: 99.7 % / Observed criterion σ(F): 0 / Observed criterion σ(I): 0 / Redundancy: 6 % / Biso Wilson estimate: 23.7 Å2 / Rmerge(I) obs: 0.069 / Net I/σ(I): 19.1
Reflection shellResolution: 2.1→2.15 Å / % possible all: 99.7
Reflection
*PLUS
Num. measured all: 188351
Reflection shell
*PLUS
Highest resolution: 2.1 Å / % possible obs: 99.7 % / Rmerge(I) obs: 0.231 / Mean I/σ(I) obs: 9.4

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Processing

Software
NameVersionClassification
REFMAC5.1.24refinement
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing
RefinementMethod to determine structure: MOLECULAR REPLACEMENT
Starting model: pdb entry 1jxj

1jxj


Resolution: 2.1→42.64 Å / Cor.coef. Fo:Fc: 0.959 / Cor.coef. Fo:Fc free: 0.938 / SU B: 3.599 / SU ML: 0.098 / Cross valid method: THROUGHOUT / σ(F): 0 / σ(I): 0 / ESU R: 0.2 / ESU R Free: 0.159 / Stereochemistry target values: MAXIMUM LIKELIHOOD / Details: BULK SOLVENT MODELLING
RfactorNum. reflection% reflectionSelection details
Rfree0.19554 1564 5 %RANDOM
Rwork0.16 ---
all0.1617 31104 --
obs0.1617 29481 99.47 %-
Solvent computationIon probe radii: 0.8 Å / Shrinkage radii: 0.8 Å / VDW probe radii: 1.4 Å / Solvent model: BABINET MODEL WITH MASK
Displacement parametersBiso mean: 23.207 Å2
Baniso -1Baniso -2Baniso -3
1--0.01 Å20 Å20 Å2
2--0.01 Å20 Å2
3---0 Å2
Refinement stepCycle: LAST / Resolution: 2.1→42.64 Å
ProteinNucleic acidLigandSolventTotal
Num. atoms3937 0 68 255 4260
Refine LS restraints
Refine-IDTypeDev idealDev ideal targetNumber
X-RAY DIFFRACTIONr_bond_refined_d0.0090.0214124
X-RAY DIFFRACTIONr_angle_refined_deg1.1711.9325599
X-RAY DIFFRACTIONr_dihedral_angle_1_deg6.1125495
X-RAY DIFFRACTIONr_chiral_restr0.0840.2578
X-RAY DIFFRACTIONr_gen_planes_refined0.0040.023231
X-RAY DIFFRACTIONr_nbd_refined0.1960.21977
X-RAY DIFFRACTIONr_xyhbond_nbd_refined0.1140.2299
X-RAY DIFFRACTIONr_symmetry_vdw_refined0.1910.243
X-RAY DIFFRACTIONr_symmetry_hbond_refined0.1350.216
X-RAY DIFFRACTIONr_mcbond_it0.5151.52452
X-RAY DIFFRACTIONr_mcangle_it0.98523939
X-RAY DIFFRACTIONr_scbond_it1.40131672
X-RAY DIFFRACTIONr_scangle_it2.2284.51660
LS refinement shellResolution: 2.097→2.151 Å / Total num. of bins used: 20 /
RfactorNum. reflection
Rfree0.253 101
Rwork0.172 2098
Refinement
*PLUS
Highest resolution: 2.1 Å / Lowest resolution: 42.6 Å / Rfactor Rfree: 0.193 / Rfactor Rwork: 0.155
Solvent computation
*PLUS
Displacement parameters
*PLUS
Refine LS restraints
*PLUS
Refine-IDTypeDev ideal
X-RAY DIFFRACTIONr_bond_d0.009
X-RAY DIFFRACTIONr_angle_d
X-RAY DIFFRACTIONr_angle_deg1.1

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