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- PDB-9i9h: Structure of FAB-fragment GB11 in complex with Sialyl Lewis A -

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Basic information

Entry
Database: PDB / ID: 9i9h
TitleStructure of FAB-fragment GB11 in complex with Sialyl Lewis A
Components(IgG antibody ...) x 2
KeywordsIMMUNE SYSTEM / Fab fragment / Carbohydrate / complex
Function / homologybeta-D-galactopyranose / DI(HYDROXYETHYL)ETHER / N-acetyl-alpha-neuraminic acid
Function and homology information
Biological speciesMus musculus (house mouse)
MethodX-RAY DIFFRACTION / SYNCHROTRON / MOLECULAR REPLACEMENT / Resolution: 2.96 Å
AuthorsFreitag, A. / Khan-Kilji, S. / Nedielkov, R. / Murali Kumar, S. / Krummhaar, M. / Luehle, J. / Goerdeler, F. / Arndt, J. / Kamphues, C. / Mroginski, M.A. ...Freitag, A. / Khan-Kilji, S. / Nedielkov, R. / Murali Kumar, S. / Krummhaar, M. / Luehle, J. / Goerdeler, F. / Arndt, J. / Kamphues, C. / Mroginski, M.A. / Roth, C. / Seeberger, P.H. / Moeller, H.M. / Moscovitz, O.
Funding support Germany, 1items
OrganizationGrant numberCountry
Max Planck Society Germany
CitationJournal: Jacs Au / Year: 2026
Title: Integrative Approach to Develop and Characterize Antibodies against the Cancer-Associated Antigen Sialyl Lewis A (CA 19-9).
Authors: Freitag, A. / Khilji, S.K. / Nedielkov, R. / M Kumar, S. / Krummhaar, M. / Arndt, J. / Moreira, G.M.S.G. / Luhle, J. / Goerdeler, F. / Kamphues, C. / Mroginski, M.A. / Roth, C. / Seeberger, ...Authors: Freitag, A. / Khilji, S.K. / Nedielkov, R. / M Kumar, S. / Krummhaar, M. / Arndt, J. / Moreira, G.M.S.G. / Luhle, J. / Goerdeler, F. / Kamphues, C. / Mroginski, M.A. / Roth, C. / Seeberger, P.H. / Moller, H.M. / Moscovitz, O.
History
DepositionFeb 6, 2025Deposition site: PDBE / Processing site: PDBE
Revision 1.0Feb 18, 2026Provider: repository / Type: Initial release
Revision 1.1May 13, 2026Group: Database references / Category: citation / citation_author
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: IgG antibody FAB fragment
B: IgG antibody Fab fragment
L: IgG antibody Fab fragment
D: IgG antibody Fab fragment
F: IgG antibody Fab fragment
H: IgG antibody FAB fragment
C: IgG antibody FAB fragment
E: IgG antibody FAB fragment
hetero molecules


Theoretical massNumber of molelcules
Total (without water)192,07121
Polymers188,1868
Non-polymers3,88613
Water32418
1


  • Idetical with deposited unit
  • defined by author
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
Buried area25750 Å2
ΔGint-46 kcal/mol
Surface area71120 Å2
Unit cell
Length a, b, c (Å)39.838, 108.697, 108.920
Angle α, β, γ (deg.)89.602, 87.339, 89.251
Int Tables number1
Space group name H-MP1
Noncrystallographic symmetry (NCS)NCS domain:
IDEns-IDDetails (eV)
11A
21A
32A
42A
53A
63A
74A
84A
95A
105A
116A
126A
137A
147A
158A
168A
179A
189A
1910A
2010A
2111A
2211A
2312A
2412A

NCS domain segments:

Beg auth comp-ID: GLU / Beg label comp-ID: GLU / Auth asym-ID: A / Label asym-ID: A

Dom-IDComponent-IDEns-IDEnd auth comp-IDEnd label comp-IDAuth seq-IDLabel seq-ID
111CYSCYS1 - 2171 - 217
211CYSCYS1 - 2171 - 217
322CYSCYS1 - 2171 - 217
422CYSCYS1 - 2171 - 217
533CYSCYS1 - 2171 - 217
633CYSCYS1 - 2171 - 217
744ILEILE1 - 2121 - 212
844ILEILE1 - 2121 - 212
955ILEILE1 - 2121 - 212
1055ILEILE1 - 2121 - 212
1166ILEILE1 - 2121 - 212
1266ILEILE1 - 2121 - 212
1377ILEILE1 - 2121 - 212
1477ILEILE1 - 2121 - 212
1588ILEILE1 - 2121 - 212
1688ILEILE1 - 2121 - 212
1799ILEILE1 - 2121 - 212
1899ILEILE1 - 2121 - 212
191010CYSCYS1 - 2171 - 217
201010CYSCYS1 - 2171 - 217
211111CYSCYS1 - 2171 - 217
221111CYSCYS1 - 2171 - 217
231212CYSCYS1 - 2171 - 217
241212CYSCYS1 - 2171 - 217

NCS ensembles :
IDDetails (eV)
1Local NCS retraints between domains: 1 2
2Local NCS retraints between domains: 3 4
3Local NCS retraints between domains: 5 6
4Local NCS retraints between domains: 7 8
5Local NCS retraints between domains: 9 10
6Local NCS retraints between domains: 11 12
7Local NCS retraints between domains: 13 14
8Local NCS retraints between domains: 15 16
9Local NCS retraints between domains: 17 18
10Local NCS retraints between domains: 19 20
11Local NCS retraints between domains: 21 22
12Local NCS retraints between domains: 23 24

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Components

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Antibody , 2 types, 8 molecules AHCEBLDF

#1: Antibody
IgG antibody FAB fragment


Mass: 23304.133 Da / Num. of mol.: 4 / Source method: isolated from a natural source / Details: heavy chain / Source: (natural) Mus musculus (house mouse) / Organ: spleen
#2: Antibody
IgG antibody Fab fragment


Mass: 23742.287 Da / Num. of mol.: 4 / Source method: isolated from a natural source / Details: light chain / Source: (natural) Mus musculus (house mouse) / Tissue: spleen

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Sugars , 5 types, 8 molecules

#3: Polysaccharide beta-D-galactopyranose-(1-3)-[alpha-L-fucopyranose-(1-4)]2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 529.490 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DGalpb1-3[LFucpa1-4]DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/3,3,2/[a2122h-1b_1-5_2*NCC/3=O][a2112h-1b_1-5][a1221m-1a_1-5]/1-2-3/a3-b1_a4-c1WURCSPDB2Glycan 1.1.0
[][b-D-GlcpNAc]{[(3+1)][b-D-Galp]{}[(4+1)][a-L-Fucp]{}}LINUCSPDB-CARE
#4: Polysaccharide N-acetyl-alpha-neuraminic acid-(2-3)-beta-D-galactopyranose-(1-3)-[alpha-L-fucopyranose-(1-4)]2- ...N-acetyl-alpha-neuraminic acid-(2-3)-beta-D-galactopyranose-(1-3)-[alpha-L-fucopyranose-(1-4)]2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 820.744 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DNeup5Aca2-3DGalpb1-3[LFucpa1-4]DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/4,4,3/[a2122h-1b_1-5_2*NCC/3=O][a2112h-1b_1-5][Aad21122h-2a_2-6_5*NCC/3=O][a1221m-1a_1-5]/1-2-3-4/a3-b1_a4-d1_b3-c2WURCSPDB2Glycan 1.1.0
[][b-D-GlcpNAc]{[(3+1)][b-D-Galp]{[(3+2)][a-D-Neup5Ac]{}}[(4+1)][a-L-Fucp]{}}LINUCSPDB-CARE
#5: Polysaccharide alpha-L-fucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 367.349 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
LFucpa1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/2,2,1/[a2122h-1b_1-5_2*NCC/3=O][a1221m-1a_1-5]/1-2/a4-b1WURCSPDB2Glycan 1.1.0
[][b-D-GlcpNAc]{[(4+1)][a-L-Fucp]{}}LINUCSPDB-CARE
#6: Sugar ChemComp-SIA / N-acetyl-alpha-neuraminic acid / N-acetylneuraminic acid / sialic acid / alpha-sialic acid / O-SIALIC ACID


Type: D-saccharide, alpha linking / Mass: 309.270 Da / Num. of mol.: 3 / Source method: obtained synthetically / Formula: C11H19NO9 / Feature type: SUBJECT OF INVESTIGATION
IdentifierTypeProgram
DNeup5AcaCONDENSED IUPAC CARBOHYDRATE SYMBOLGMML 1.0
N-acetyl-a-D-neuraminic acidCOMMON NAMEGMML 1.0
a-D-Neup5AcIUPAC CARBOHYDRATE SYMBOLPDB-CARE 1.0
Neu5AcSNFG CARBOHYDRATE SYMBOLGMML 1.0
#8: Sugar ChemComp-GAL / beta-D-galactopyranose / beta-D-galactose / D-galactose / galactose


Type: D-saccharide, beta linking / Mass: 180.156 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C6H12O6 / Feature type: SUBJECT OF INVESTIGATION
IdentifierTypeProgram
DGalpbCONDENSED IUPAC CARBOHYDRATE SYMBOLGMML 1.0
b-D-galactopyranoseCOMMON NAMEGMML 1.0
b-D-GalpIUPAC CARBOHYDRATE SYMBOLPDB-CARE 1.0
GalSNFG CARBOHYDRATE SYMBOLGMML 1.0

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Non-polymers , 2 types, 23 molecules

#7: Chemical
ChemComp-PEG / DI(HYDROXYETHYL)ETHER


Mass: 106.120 Da / Num. of mol.: 5 / Source method: obtained synthetically / Formula: C4H10O3 / Feature type: SUBJECT OF INVESTIGATION
#9: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 18 / Source method: isolated from a natural source / Formula: H2O

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Details

Has ligand of interestY
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: 2.51 Å3/Da / Density % sol: 51.1 %
Crystal growTemperature: 292 K / Method: vapor diffusion, hanging drop / Details: sodium malonate PEG 3350

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Data collection

DiffractionMean temperature: 100 K / Serial crystal experiment: N
Diffraction sourceSource: SYNCHROTRON / Site: BESSY / Beamline: 14.2 / Wavelength: 0.9184 Å
DetectorType: DECTRIS PILATUS 2M / Detector: PIXEL / Date: Dec 10, 2021
RadiationMonochromator: Si (111) / Protocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray
Radiation wavelengthWavelength: 0.9184 Å / Relative weight: 1
ReflectionResolution: 2.9→26.98 Å / Num. obs: 40947 / % possible obs: 98.2 % / Redundancy: 3 % / Biso Wilson estimate: 49.14 Å2 / CC1/2: 0.915 / Rpim(I) all: 0.222 / Rrim(I) all: 0.407 / Net I/σ(I): 2.8
Reflection shellResolution: 2.9→3.02 Å / Mean I/σ(I) obs: 0.6 / Num. unique obs: 4497 / CC1/2: 0.189 / Rpim(I) all: 1.359 / Rrim(I) all: 2.583

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Processing

Software
NameVersionClassification
REFMAC5.8.0419refinement
DIALSdata reduction
Aimlessdata scaling
PHASERphasing
RefinementMethod to determine structure: MOLECULAR REPLACEMENT / Resolution: 2.96→26.696 Å / Cor.coef. Fo:Fc: 0.926 / Cor.coef. Fo:Fc free: 0.884 / Cross valid method: FREE R-VALUE / ESU R Free: 0.462
Details: Hydrogens have been added in their riding positions
RfactorNum. reflection% reflection
Rfree0.2479 1994 5.306 %
Rwork0.2097 35589 -
all0.212 --
obs-37583 98.697 %
Solvent computationIon probe radii: 0.8 Å / Shrinkage radii: 0.8 Å / VDW probe radii: 1.2 Å / Solvent model: MASK BULK SOLVENT
Displacement parametersBiso mean: 61.588 Å2
Baniso -1Baniso -2Baniso -3
1-2.256 Å2-1.535 Å20.416 Å2
2--0.204 Å20.366 Å2
3----2.447 Å2
Refinement stepCycle: LAST / Resolution: 2.96→26.696 Å
ProteinNucleic acidLigandSolventTotal
Num. atoms13216 0 259 18 13493
Refine LS restraints
Refine-IDTypeDev idealDev ideal targetNumber
X-RAY DIFFRACTIONr_bond_refined_d0.0050.01213817
X-RAY DIFFRACTIONr_bond_other_d0.0020.01612434
X-RAY DIFFRACTIONr_ext_dist_refined_b0.010.01511
X-RAY DIFFRACTIONr_angle_refined_deg1.3211.81218784
X-RAY DIFFRACTIONr_angle_other_deg0.7411.74328862
X-RAY DIFFRACTIONr_dihedral_angle_1_deg7.81451710
X-RAY DIFFRACTIONr_dihedral_angle_2_deg6.989564
X-RAY DIFFRACTIONr_dihedral_angle_3_deg15.574102173
X-RAY DIFFRACTIONr_dihedral_angle_6_deg12.74410557
X-RAY DIFFRACTIONr_chiral_restr0.060.22105
X-RAY DIFFRACTIONr_gen_planes_refined0.0050.0215989
X-RAY DIFFRACTIONr_gen_planes_other0.0060.023087
X-RAY DIFFRACTIONr_nbd_refined0.2520.22495
X-RAY DIFFRACTIONr_symmetry_nbd_other0.2320.211926
X-RAY DIFFRACTIONr_nbtor_refined0.1790.26660
X-RAY DIFFRACTIONr_symmetry_nbtor_other0.0890.27079
X-RAY DIFFRACTIONr_xyhbond_nbd_refined0.2590.2341
X-RAY DIFFRACTIONr_symmetry_xyhbond_nbd_other0.0750.24
X-RAY DIFFRACTIONr_symmetry_nbd_refined0.2120.243
X-RAY DIFFRACTIONr_nbd_other0.2710.2236
X-RAY DIFFRACTIONr_symmetry_xyhbond_nbd_refined0.3410.212
X-RAY DIFFRACTIONr_xyhbond_nbd_other0.1320.22
X-RAY DIFFRACTIONr_mcbond_it5.3036.0966861
X-RAY DIFFRACTIONr_mcbond_other5.3026.0966861
X-RAY DIFFRACTIONr_mcangle_it8.59410.9448564
X-RAY DIFFRACTIONr_mcangle_other8.59410.9458565
X-RAY DIFFRACTIONr_scbond_it5.0156.4146956
X-RAY DIFFRACTIONr_scbond_other5.0156.4146957
X-RAY DIFFRACTIONr_scangle_it8.28411.64110220
X-RAY DIFFRACTIONr_scangle_other8.28411.64110221
X-RAY DIFFRACTIONr_lrange_it13.7774.26255895
X-RAY DIFFRACTIONr_lrange_other13.7774.26255896
X-RAY DIFFRACTIONr_ncsr_local_group_10.0980.056577
X-RAY DIFFRACTIONr_ncsr_local_group_20.0990.056577
X-RAY DIFFRACTIONr_ncsr_local_group_30.150.056239
X-RAY DIFFRACTIONr_ncsr_local_group_40.0850.056621
X-RAY DIFFRACTIONr_ncsr_local_group_50.0880.056581
X-RAY DIFFRACTIONr_ncsr_local_group_60.0830.056587
X-RAY DIFFRACTIONr_ncsr_local_group_70.0880.056605
X-RAY DIFFRACTIONr_ncsr_local_group_80.0910.056604
X-RAY DIFFRACTIONr_ncsr_local_group_90.0960.056565
X-RAY DIFFRACTIONr_ncsr_local_group_100.0880.056603
X-RAY DIFFRACTIONr_ncsr_local_group_110.1480.056249
X-RAY DIFFRACTIONr_ncsr_local_group_120.1480.056222
Refine LS restraints NCS
Ens-IDDom-IDAuth asym-IDRefine-IDTypeRms dev position (Å)Weight position
11AX-RAY DIFFRACTIONLocal ncs0.09780.0501
12AX-RAY DIFFRACTIONLocal ncs0.09780.0501
23AX-RAY DIFFRACTIONLocal ncs0.099050.0501
24AX-RAY DIFFRACTIONLocal ncs0.099050.0501
35AX-RAY DIFFRACTIONLocal ncs0.150.0501
36AX-RAY DIFFRACTIONLocal ncs0.150.0501
47AX-RAY DIFFRACTIONLocal ncs0.08530.05011
48AX-RAY DIFFRACTIONLocal ncs0.08530.05011
59AX-RAY DIFFRACTIONLocal ncs0.088080.0501
510AX-RAY DIFFRACTIONLocal ncs0.088080.0501
611AX-RAY DIFFRACTIONLocal ncs0.082690.0501
612AX-RAY DIFFRACTIONLocal ncs0.082690.0501
713AX-RAY DIFFRACTIONLocal ncs0.088380.05011
714AX-RAY DIFFRACTIONLocal ncs0.088380.05011
815AX-RAY DIFFRACTIONLocal ncs0.091020.05011
816AX-RAY DIFFRACTIONLocal ncs0.091020.05011
917AX-RAY DIFFRACTIONLocal ncs0.09550.05011
918AX-RAY DIFFRACTIONLocal ncs0.09550.05011
1019AX-RAY DIFFRACTIONLocal ncs0.087510.05011
1020AX-RAY DIFFRACTIONLocal ncs0.087510.05011
1121AX-RAY DIFFRACTIONLocal ncs0.148110.0501
1122AX-RAY DIFFRACTIONLocal ncs0.148110.0501
1223AX-RAY DIFFRACTIONLocal ncs0.147640.0501
1224AX-RAY DIFFRACTIONLocal ncs0.147640.0501
LS refinement shell

Refine-ID: X-RAY DIFFRACTION / Total num. of bins used: 20

Resolution (Å)Rfactor RfreeNum. reflection RfreeRfactor RworkNum. reflection RworkRfactor allNum. reflection allFsc freeFsc work% reflection obs (%)WRfactor Rwork
2.96-3.0360.3621450.35426570.35528490.8990.90898.35030.356
3.036-3.1180.3411340.34825160.34826910.910.90798.47640.352
3.118-3.2070.33980.32624830.32626130.9170.91998.77540.329
3.207-3.3040.3171140.31924430.31926240.9290.92597.44660.319
3.304-3.4110.3521170.28322680.28724230.9080.94398.43170.281
3.411-3.5290.2781350.24122470.24324020.9470.95999.16740.235
3.529-3.6590.2721210.23222100.23423580.9490.96298.8550.222
3.659-3.8060.2261210.19720540.19821990.9660.97498.90860.185
3.806-3.9710.2421200.20820670.2122040.9560.97199.22870.196
3.971-4.1610.212940.17718950.17820100.9690.9898.95520.162
4.161-4.380.246920.16618830.1719930.9610.98299.09680.151
4.38-4.6380.1771180.13816600.1418000.9830.98898.77780.123
4.638-4.9470.192790.13316980.13517920.980.98999.16290.118
4.947-5.3280.2391360.14314410.15115900.9710.98899.18240.124
5.328-5.8140.2171040.15514030.15915140.9690.98699.53760.139
5.814-6.4620.217520.16512990.16713650.9730.98398.97440.145
6.462-7.390.225700.17811150.18111960.9670.9899.08030.162
7.39-8.8820.216780.1569550.1610390.9730.98699.42250.143
8.882-11.9190.188220.1638030.1648280.9770.98799.63770.159
11.919-26.6960.253440.3074910.3025370.9630.94999.62760.302

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