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- PDB-9y6b: CRYSTAL STRUCTURE OF A149T VARIANT OF SERINE HYDROXYMETHYLTRANSFE... -

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Basic information

Entry
Database: PDB / ID: 9y6b
TitleCRYSTAL STRUCTURE OF A149T VARIANT OF SERINE HYDROXYMETHYLTRANSFERASE 8 FROM SOYBEAN CULTIVAR ESSEX IN COMPLEX WITH PLP-GLYCINE
ComponentsSerine hydroxymethyltransferase
KeywordsTRANSFERASE / enzyme / missense variant
Function / homology
Function and homology information


glycine hydroxymethyltransferase / glycine hydroxymethyltransferase activity / : / tetrahydrofolate interconversion / methyltransferase activity / pyridoxal phosphate binding / methylation
Similarity search - Function
Serine hydroxymethyltransferase, pyridoxal phosphate binding site / Serine hydroxymethyltransferase pyridoxal-phosphate attachment site. / : / Serine hydroxymethyltransferase / Serine hydroxymethyltransferase-like domain / Serine hydroxymethyltransferase / Pyridoxal phosphate-dependent transferase, small domain / Pyridoxal phosphate-dependent transferase, major domain / Pyridoxal phosphate-dependent transferase
Similarity search - Domain/homology
Chem-PLG / Serine hydroxymethyltransferase
Similarity search - Component
Biological speciesGlycine max (soybean)
MethodX-RAY DIFFRACTION / SYNCHROTRON / MOLECULAR REPLACEMENT / Resolution: 1.9 Å
AuthorsBeamer, L.J. / Samarakoon, V. / Owuocha, L.F.
Funding support United States, 1items
OrganizationGrant numberCountry
National Science Foundation (NSF, United States)IOS 2152548 United States
CitationJournal: FEBS J / Year: 2026
Title: Oligomeric defects in soybean serine hydroxymethyltransferase 8: tetramer destabilization by A149T and other variants associated with soybean cyst nematode resistance.
Authors: Vindya Samarakoon / David P Buckley / Luckio F Owuocha / Clarissa L Durie / Melissa G Mitchum / Lesa J Beamer /
Abstract: Serine hydroxymethyltransferase (SHMT) is a conserved enzyme in folate-mediated one-carbon metabolism, where it contributes to nucleotide biosynthesis, methylation capacity, and cellular stress ...Serine hydroxymethyltransferase (SHMT) is a conserved enzyme in folate-mediated one-carbon metabolism, where it contributes to nucleotide biosynthesis, methylation capacity, and cellular stress responses. Amino acid polymorphisms of soybean SHMT8 are known to affect the resistance of soybean to its primary pathogen, the soybean cyst nematode (SCN). A set of SHMT8 variants from ethyl methanesulfonate (EMS)-mutagenized soybean populations has been identified with varying resistance phenotypes, but their biochemical consequences remain poorly understood. Here, we use biochemical and structural studies to assess the impacts of the A149T variant on soybean SHMT8. Despite the conservative nature of the substitution, A149T reduces folate binding, pyridoxal-5'-phosphate-dependent catalysis, and thermal stability. High-resolution crystal structures (1.9-2.3 Å resolution) reveal only very minor structural changes. However, while the usual tetrameric assembly of the enzyme is retained at the high protein concentration in crystals, multiple other methods including a 2.9 Å cryo-electron microscopy (cryo-EM) structure show that the A149T variant is predominantly a dimer. Significant structural changes in the dimer are consistent with the observed biochemical impacts of the variant and help explain the well-known reduction in activity associated with dimerization of SHMT in other systems. We also find destabilization of the tetrameric assembly in other SHMT8 variants associated with changes in SCN resistance, suggesting that weakened oligomerization may be a common consequence of such mutations. Together, these results highlight quaternary structure as a critical determinant of SHMT8 activity and stability and suggest a potential mechanistic link between enzyme biochemistry and soybean defense.
History
DepositionSep 8, 2025Deposition site: RCSB / Processing site: RCSB
Revision 1.0Apr 8, 2026Provider: repository / Type: Initial release
Revision 2.0Apr 22, 2026Group: Advisory / Atomic model ...Advisory / Atomic model / Database references / Derived calculations / Polymer sequence / Source and taxonomy / Structure summary
Category: atom_site / atom_site_anisotrop ...atom_site / atom_site_anisotrop / citation / citation_author / entity / entity_poly / entity_poly_seq / entity_src_gen / pdbx_poly_seq_scheme / pdbx_struct_sheet_hbond / pdbx_unobs_or_zero_occ_atoms / pdbx_unobs_or_zero_occ_residues / struct_conf / struct_mon_prot_cis / struct_ref_seq / struct_ref_seq_dif / struct_sheet_range
Item: _atom_site.label_seq_id / _atom_site_anisotrop.pdbx_label_seq_id ..._atom_site.label_seq_id / _atom_site_anisotrop.pdbx_label_seq_id / _citation.country / _citation.journal_abbrev / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year / _entity.formula_weight / _entity_poly.pdbx_seq_one_letter_code / _entity_poly.pdbx_seq_one_letter_code_can / _entity_src_gen.pdbx_end_seq_num / _pdbx_struct_sheet_hbond.range_1_label_seq_id / _pdbx_struct_sheet_hbond.range_2_label_seq_id / _pdbx_unobs_or_zero_occ_atoms.label_seq_id / _struct_conf.beg_label_seq_id / _struct_conf.end_label_seq_id / _struct_mon_prot_cis.label_seq_id / _struct_mon_prot_cis.pdbx_label_seq_id_2 / _struct_ref_seq.seq_align_beg / _struct_ref_seq.seq_align_end / _struct_sheet_range.beg_label_seq_id / _struct_sheet_range.end_label_seq_id

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Serine hydroxymethyltransferase
B: Serine hydroxymethyltransferase
C: Serine hydroxymethyltransferase
D: Serine hydroxymethyltransferase
E: Serine hydroxymethyltransferase
hetero molecules


Theoretical massNumber of molelcules
Total (without water)275,14610
Polymers273,6155
Non-polymers1,5315
Water11,313628
1
A: Serine hydroxymethyltransferase
B: Serine hydroxymethyltransferase
C: Serine hydroxymethyltransferase
D: Serine hydroxymethyltransferase
hetero molecules


Theoretical massNumber of molelcules
Total (without water)220,1178
Polymers218,8924
Non-polymers1,2254
Water724
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
Unit cell
Length a, b, c (Å)174.351, 174.351, 183.632
Angle α, β, γ (deg.)90.000, 90.000, 120.000
Int Tables number152
Space group name H-MP3121
Space group name HallP312"
Symmetry operation#1: x,y,z
#2: -y,x-y,z+1/3
#3: -x+y,-x,z+2/3
#4: x-y,-y,-z+2/3
#5: -x,-x+y,-z+1/3
#6: y,x,-z
DetailsThe ASU contains 6 chains (A,B,C,D,E,F), where the chains A, B, C and D forms the tetramer in the ASU while chains E and F forms tetramers with their symmetry operators, out of the ASU. This mutant datasets show sever tNCS and always have very poor density for chain F. Hence we have left it out and did not build in the chain.

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Components

#1: Protein
Serine hydroxymethyltransferase


Mass: 54722.965 Da / Num. of mol.: 5 / Mutation: A149T
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Glycine max (soybean) / Gene: SHMT / Production host: Escherichia coli (E. coli)
References: UniProt: K4FZF8, glycine hydroxymethyltransferase
#2: Chemical
ChemComp-PLG / N-GLYCINE-[3-HYDROXY-2-METHYL-5-PHOSPHONOOXYMETHYL-PYRIDIN-4-YL-METHANE] / N-PYRIDOXYL-GLYCINE-5-MONOPHOSPHATE


Mass: 306.209 Da / Num. of mol.: 5 / Source method: obtained synthetically / Formula: C10H15N2O7P / Feature type: SUBJECT OF INVESTIGATION
#3: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 628 / Source method: isolated from a natural source / Formula: H2O
Has ligand of interestY
Has protein modificationN

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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: 2.98 Å3/Da / Density % sol: 58.67 %
Crystal growTemperature: 293 K / Method: vapor diffusion, sitting drop
Details: 0.2 M Ammonium phosphate dibasic 20% w/v Polyethylene glycol 3,350

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Data collection

DiffractionMean temperature: 100 K / Serial crystal experiment: N
Diffraction sourceSource: SYNCHROTRON / Site: ALS / Beamline: 4.2.2 / Wavelength: 1 Å
DetectorType: RDI CMOS_8M / Detector: CMOS / Date: May 24, 2025
RadiationProtocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray
Radiation wavelengthWavelength: 1 Å / Relative weight: 1
ReflectionResolution: 1.9→48.54 Å / Num. obs: 251695 / % possible obs: 99.34 % / Redundancy: 10.3 % / Biso Wilson estimate: 29.17 Å2 / CC1/2: 0.999 / Net I/σ(I): 16.5
Reflection shellResolution: 1.9→1.92 Å / Redundancy: 10.6 % / Mean I/σ(I) obs: 1.6 / Num. unique obs: 12400 / CC1/2: 0.616 / % possible all: 99.91

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Processing

Software
NameVersionClassification
PHENIX1.21.2_5419refinement
XDSdata reduction
Aimlessdata scaling
PHASERphasing
RefinementMethod to determine structure: MOLECULAR REPLACEMENT / Resolution: 1.9→48.54 Å / SU ML: 0.3216 / Cross valid method: FREE R-VALUE / σ(F): 1.01 / Phase error: 37.0993
Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2
RfactorNum. reflection% reflection
Rfree0.3193 12710 5.08 %
Rwork0.2823 237703 -
obs0.2841 250413 99.37 %
Solvent computationShrinkage radii: 0.9 Å / VDW probe radii: 1.1 Å / Solvent model: FLAT BULK SOLVENT MODEL
Displacement parametersBiso mean: 40.15 Å2
Refinement stepCycle: LAST / Resolution: 1.9→48.54 Å
ProteinNucleic acidLigandSolventTotal
Num. atoms17182 0 100 628 17910
Refine LS restraints
Refine-IDTypeDev idealNumber
X-RAY DIFFRACTIONf_bond_d0.006617677
X-RAY DIFFRACTIONf_angle_d0.841924022
X-RAY DIFFRACTIONf_chiral_restr0.04772630
X-RAY DIFFRACTIONf_plane_restr0.00673145
X-RAY DIFFRACTIONf_dihedral_angle_d15.0556200
LS refinement shell
Resolution (Å)Rfactor RfreeNum. reflection RfreeRfactor RworkNum. reflection RworkRefine-ID% reflection obs (%)
1.9-1.920.42553970.40757928X-RAY DIFFRACTION99.93
1.92-1.940.42714380.38817851X-RAY DIFFRACTION99.92
1.94-1.970.38564010.36467923X-RAY DIFFRACTION99.98
1.97-1.990.40814610.37187899X-RAY DIFFRACTION99.99
1.99-2.020.38894510.36457881X-RAY DIFFRACTION99.99
2.02-2.050.40224540.34577887X-RAY DIFFRACTION99.93
2.05-2.080.3654280.33947968X-RAY DIFFRACTION99.87
2.08-2.110.38374310.33387863X-RAY DIFFRACTION99.82
2.11-2.140.3454060.31317921X-RAY DIFFRACTION99.71
2.14-2.170.36454120.32187921X-RAY DIFFRACTION99.93
2.17-2.210.37494540.31147892X-RAY DIFFRACTION99.87
2.21-2.250.33954470.30167894X-RAY DIFFRACTION99.73
2.25-2.30.33824600.29757796X-RAY DIFFRACTION98.36
2.3-2.340.35274030.30467894X-RAY DIFFRACTION99.59
2.34-2.390.34383990.297899X-RAY DIFFRACTION99.59
2.39-2.450.35764380.28427894X-RAY DIFFRACTION99.46
2.45-2.510.33234140.28437952X-RAY DIFFRACTION99.61
2.51-2.580.32784450.27917894X-RAY DIFFRACTION99.42
2.58-2.650.34413700.29417936X-RAY DIFFRACTION99.19
2.65-2.740.32154820.28097864X-RAY DIFFRACTION99.5
2.74-2.840.29793690.28327908X-RAY DIFFRACTION98.83
2.84-2.950.33884080.28237954X-RAY DIFFRACTION99.16
2.95-3.090.33164230.27697860X-RAY DIFFRACTION98.57
3.09-3.250.32634130.28237883X-RAY DIFFRACTION98.53
3.25-3.450.30544020.27097922X-RAY DIFFRACTION98.74
3.45-3.720.29023720.25487991X-RAY DIFFRACTION98.55
3.72-4.090.25784070.24167957X-RAY DIFFRACTION98.97
4.09-4.680.25524570.2317874X-RAY DIFFRACTION97.86
4.68-5.90.26974210.25168108X-RAY DIFFRACTION99.56
5.9-48.540.3514470.30098289X-RAY DIFFRACTION99.19
Refinement TLS params.

Method: refined / Refine-ID: X-RAY DIFFRACTION

IDL112)L122)L132)L222)L232)L332)S11 (Å °)S12 (Å °)S13 (Å °)S21 (Å °)S22 (Å °)S23 (Å °)S31 (Å °)S32 (Å °)S33 (Å °)T112)T122)T132)T222)T232)T332)Origin x (Å)Origin y (Å)Origin z (Å)
10.4222432186080.0935012242834-0.02613637172360.3282723447530.002468145069360.309822440598-0.1324879317940.0395792379316-0.56636566111-0.1220857588320.0140442031979-0.3610659196340.0677814144959-0.112754720823-0.1851533886130.164748105650.05172167362790.09777128397120.1957599121740.04460333516040.514149081235111.425882591-69.21036573573.82240544718
20.187121092579-0.008653869287880.1218145966790.5258095635920.01313499788450.0905242966335-0.109941188508-0.013103821015-0.2602925089150.1589435126140.00512787108833-0.45508241845-0.0590826377302-0.0854992175909-0.07361262272920.2427658503680.02822006339480.0817362542660.2678565357230.01771637181280.318343296093114.925538864-48.1364663062.39010568596
30.029485567378-0.02654506123690.02687427843010.06107713220850.01023139083090.0556275303638-0.06647988252380.03078105224780.05821049265320.09132206383080.01168569464450.06258966165610.0240635445507-0.0980332158721-0.0992004721260.2356369963660.04418812403060.04428883554580.254469619694-0.05397139095250.10048110747592.9191441964-30.52868842121.81055620007
40.235756643251-0.166430160026-0.01506978829960.1163341530310.01004750711460.0255779740432-0.069418894151-0.01942899675190.1711456434290.1364409283220.0247548971424-0.150404343389-0.0451400404896-0.0715371760089-0.03865002468130.24513959260.04580717176240.01862206866930.236004549195-0.004279396630730.165849872202106.902552827-31.94806940121.39949321627
50.0679026237719-0.07446752480930.0673343024830.150114193341-0.08205522106140.06779395585660.003052482354220.1737197051920.0916359423503-0.0520018735423-0.0734457875892-0.398170656585-0.100775433501-0.1026957731390.004898568077490.2700170723850.01073237555070.1072776405620.3493155286430.05014203515520.35489547099112.917185302-22.6599837677-18.1206528208
60.0124724871170.05785261728580.02922477014280.2328527009810.12037115720.0660428444454-0.00973880689330.148362162869-0.1078507044290.0767255040936-0.00941089477336-0.1633401868370.0301171941479-0.007527957948870.07695569687350.2632815275590.01490902392920.230860808930.3398002861450.1050775551070.579763340538127.825067012-31.5289281355-14.2604987806
70.18382333225-0.0940386616520.1332647606690.0844101696946-0.0515235818090.148379484487-0.1378285228320.123245199271-0.3343605747180.101468631888-0.04548887934420.276588681199-0.0121084727639-0.0488943411659-0.1778535886620.0622692641070.1283961528610.07328331663030.163328324728-0.04631433772220.938945739242-15.7893180489-25.86630157981.5663970553
80.1714578033690.0726135182169-0.0694096980840.123560687841-0.06895896305450.151589729832-0.2032912493720.05605279672610.11366027371-0.0507822070630.103908931981-0.29513922017-0.07036808184050.0974448908792-0.09196982587410.02001332441560.126032903234-0.1017192553990.1340788930730.0863815046910.85784361459611.4971927589-13.51658166785.4648659169
90.267290830574-0.05812473973880.1332102108640.3730352222510.06404169999150.0798510092565-0.2650110269590.000498648742125-0.1796270210990.1787616346250.1239144161120.0994616855036-0.02810362292110.11003286495-0.05398739760730.07696305234430.04142470296090.03458059187810.2099138576940.07424935053810.6971951446095.90504137183-26.15719289351.3362645198
100.0114424116752-0.00990263099475-0.04392699628550.05917890129480.01168605484950.116058136403-0.0647673432578-0.0010776284111-0.217046582810.0195360916204-0.02521595110920.0895527865590.03927802861120.157017871889-0.04252303065930.04310207083590.06385465703030.05316273176910.283427372385-0.1538000120750.7276223257214.68570356281-39.547045091-16.9899388039
110.176173514330.231468982306-0.0685909272170.331008945685-0.08474443199520.0229456528339-0.0660920936655-0.0363267213640.09621450158690.04307335474180.02788183954220.203659033050.0531849592264-0.00169673616259-0.01257906867020.193215837722-0.01043188436690.01414890154910.279540835035-0.01537868438040.15895367369144.6577895073-50.30395343851.92369843722
120.0295587416178-0.01417897926430.01042658456120.01848863254110.005567115291220.03969696384510.02346589037770.202984958549-0.393874295681-0.145304910747-0.121518509196-0.07897984930490.1382653716190.00689589877636-8.25213991677E-60.2635893104060.0285433996960.0586396951790.309220732892-0.01492777738620.60517120077469.5157530062-67.39890106050.588566030558
130.0871931075769-0.0432814327158-0.1023426286660.09893744675660.01209200213940.120062776529-0.0282332368543-0.120493767352-0.3723030698450.06450468413950.0105158343548-0.0700730976286-0.01143422477440.0617113883064-0.0005953991342650.2170435343340.006573885554520.02785872333960.2951451414390.03725654744240.35756877245254.5562331285-63.17684092259.37264397588
140.300000171353-0.2409127350190.05260094361590.230036903553-0.03364027760880.0796242702694-0.2238514994420.0539159693548-0.327272422463-0.01442090013390.07235860611290.03693866356470.12341408974-0.111359172495-0.01998304057210.256652527025-0.09044979920470.08460609216530.267561980216-0.1306491059310.45391864728944.915427839-76.4375150749-13.2919437039
150.158689050417-0.002594064569990.08118787123320.0713198179999-0.05698752543940.0791681497215-0.0758310723480.02968658459570.0288136865796-0.08548180841260.1166414310760.1993761055480.0432669226655-0.05454705736437.26140961557E-60.263306878096-0.007451786396230.0119403265340.306797388866-0.03178726157680.320587168840.69802299-49.683673981-3.57609536045
160.6249361183140.132925660168-0.09214689279410.149934721767-0.01093193645120.161858289462-0.05623603886490.1157194982930.419964360919-0.1116835263470.0425450598629-0.0453085324923-0.0191755625486-0.00891173671282-0.01857893536750.218294675616-0.01418350407150.01739473439210.310623189452-0.007599655430450.15152327188459.303622197-33.0305259702-8.30972536435
170.1268446418490.166056231040.03018038920960.338539896033-0.04886047800820.0904260101047-0.018362888719-0.1496740195580.2297173415830.08498419548940.1469376569020.31689725617-0.02636230708120.02744442921240.05005366837340.2194760483480.05232658341790.07004702169650.354368484211-0.074217497530.46075833336842.4351503588-23.75756882629.82068380508
180.109995031413-0.0799734484670.005477295225180.146063058280.04020559241320.0669196591748-0.1095065852430.0780095760276-0.213454511009-0.08721753299930.0606465627118-0.401107256405-0.04248195960750.06610167343220.003393848736640.2063255199730.03672466938460.0461877123250.2011360418320.01034356288020.521768904051118.9300897-48.841695161-2.56314365226
190.1124101684930.01992145785960.09073265160190.0293051843102-0.003993455009310.330438570380.00864416684828-0.0551831218562-0.6472225040180.01870187760660.009868369638380.0744279759151-0.00546736514226-0.0463457591603-0.02388848128370.20531160763-0.007770604748340.1107263108010.191668751318-0.07617729130290.60285561106494.4827196373-66.3442080446-6.66495776781
Refinement TLS group

Refine-ID: X-RAY DIFFRACTION

IDRefine TLS-IDSelection detailsAuth asym-IDLabel asym-IDAuth seq-IDLabel seq-ID
11chain 'C' and (resid 237 through 470 )CE237 - 470239 - 460
22chain 'D' and (resid -1 through 117 )DG-1 - 1171 - 119
33chain 'D' and (resid 118 through 241 )DG118 - 241120 - 243
44chain 'D' and (resid 242 through 367 )DG242 - 367244 - 367
55chain 'D' and (resid 368 through 440 )DG368 - 440368 - 434
66chain 'D' and (resid 441 through 470 )DG441 - 470435 - 464
77chain 'E' and (resid -1 through 89 )EI-1 - 891 - 91
88chain 'E' and (resid 90 through 241 )EI90 - 24192 - 243
99chain 'E' and (resid 242 through 401 )EI242 - 401244 - 391
1010chain 'E' and (resid 402 through 470 )EI402 - 470392 - 460
1111chain 'A' and (resid 0 through 117 )AA0 - 1171 - 118
1212chain 'A' and (resid 118 through 197 )AA118 - 197119 - 198
1313chain 'A' and (resid 198 through 332 )AA198 - 332199 - 326
1414chain 'A' and (resid 333 through 470 )AA333 - 470327 - 457
1515chain 'B' and (resid 0 through 89 )BC0 - 891 - 90
1616chain 'B' and (resid 90 through 367 )BC90 - 36791 - 359
1717chain 'B' and (resid 368 through 470 )BC368 - 470360 - 458
1818chain 'C' and (resid -1 through 89 )CE-1 - 891 - 91
1919chain 'C' and (resid 90 through 236 )CE90 - 23692 - 238

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