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- PDB-8ca9: Cryo-EM structure of the Cibeles-Demetra 3:3 heterocomplex from G... -

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Basic information

Entry
Database: PDB / ID: 8ca9
TitleCryo-EM structure of the Cibeles-Demetra 3:3 heterocomplex from Galleria mellonella saliva
Components
  • Arylphorin
  • Demetra
KeywordsUNKNOWN FUNCTION / Galleria mellonella / Wax worm saliva / Plastic degradation / Polyethylene degradation / PEases / Hexamerin / Hemocyanin/phenoloxidase superfamily / Metal binding / Arylphorin
Function / homology
Function and homology information


nutrient reservoir activity / extracellular region
Similarity search - Function
Arthropod hemocyanins / insect LSPs signature 1. / Arthropod hemocyanins / insect LSPs signature 2. / Hemocyanin, N-terminal / Hemocyanin, N-terminal domain superfamily / Hemocyanin, all-alpha domain / Hemocyanin, C-terminal domain superfamily / Hemocyanin/hexamerin middle domain / Hemocyanin, C-terminal / Hemocyanin, copper containing domain / Hemocyanin, ig-like domain ...Arthropod hemocyanins / insect LSPs signature 1. / Arthropod hemocyanins / insect LSPs signature 2. / Hemocyanin, N-terminal / Hemocyanin, N-terminal domain superfamily / Hemocyanin, all-alpha domain / Hemocyanin, C-terminal domain superfamily / Hemocyanin/hexamerin middle domain / Hemocyanin, C-terminal / Hemocyanin, copper containing domain / Hemocyanin, ig-like domain / Hemocyanin/hexamerin / Di-copper centre-containing domain superfamily / Immunoglobulin E-set
Similarity search - Domain/homology
COPPER (II) ION / Arylphorin
Similarity search - Component
Biological speciesGalleria mellonella (greater wax moth)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.29 Å
AuthorsSpinola-Amilibia, M. / Arias-Palomo, E.
Funding support Germany, Belgium, Spain, 7items
OrganizationGrant numberCountry
Roechling Stiftung Germany
NATO Science for Peace and Security ProgramSPS G5536 Belgium
Junta de Castilla y Leon, Consejeria de Educacion y Cultura y Fondo Social EuropeoBU263P18 Spain
Spanish Ministry of Science, Innovation, and UniversitiesPID2019-111215RB-100 Spain
Generalitat de Catalunya2017 SGR 1192 Spain
Spanish Ministry of Science, Innovation, and UniversitiesPID2020-120275GB-I00 Spain
Spanish National Research Council Spain
CitationJournal: Sci Adv / Year: 2023
Title: Plastic degradation by insect hexamerins: Near-atomic resolution structures of the polyethylene-degrading proteins from the wax worm saliva.
Authors: Mercedes Spínola-Amilibia / Ramiro Illanes-Vicioso / Elena Ruiz-López / Pere Colomer-Vidal / Francisco Rodriguez-Ventura / Rosa Peces Pérez / Clemente F Arias / Tomas Torroba / Maria ...Authors: Mercedes Spínola-Amilibia / Ramiro Illanes-Vicioso / Elena Ruiz-López / Pere Colomer-Vidal / Francisco Rodriguez-Ventura / Rosa Peces Pérez / Clemente F Arias / Tomas Torroba / Maria Solà / Ernesto Arias-Palomo / Federica Bertocchini /
Abstract: Plastic waste management is a pressing ecological, social, and economic challenge. The saliva of the lepidopteran larvae is capable of oxidizing and depolymerizing polyethylene in hours at room ...Plastic waste management is a pressing ecological, social, and economic challenge. The saliva of the lepidopteran larvae is capable of oxidizing and depolymerizing polyethylene in hours at room temperature. Here, we analyze by cryo-electron microscopy (cryo-EM) 's saliva directly from the native source. The three-dimensional reconstructions reveal that the buccal secretion is mainly composed of four hexamerins belonging to the hemocyanin/phenoloxidase family, renamed Demetra, Cibeles, Ceres, and a previously unidentified factor termed Cora. Functional assays show that this factor, as its counterparts Demetra and Ceres, is also able to oxidize and degrade polyethylene. The cryo-EM data and the x-ray analysis from purified fractions show that they self-assemble primarily into three macromolecular complexes with striking structural differences that likely modulate their activity. Overall, these results establish the ground to further explore the hexamerins' functionalities, their role in vivo, and their eventual biotechnological application.
History
DepositionJan 24, 2023Deposition site: PDBE / Processing site: PDBE
Revision 1.0Oct 4, 2023Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Arylphorin
B: Arylphorin
C: Arylphorin
D: Demetra
E: Demetra
F: Demetra
hetero molecules


Theoretical massNumber of molelcules
Total (without water)513,35921
Polymers501,2656
Non-polymers12,09315
Water37,9582107
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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Protein , 2 types, 6 molecules ABCDEF

#1: Protein Arylphorin / Lhp76


Mass: 83778.000 Da / Num. of mol.: 3 / Source method: isolated from a natural source / Source: (natural) Galleria mellonella (greater wax moth) / References: UniProt: Q24995
#2: Protein Demetra / Arylphorin


Mass: 83310.484 Da / Num. of mol.: 3 / Source method: isolated from a natural source / Source: (natural) Galleria mellonella (greater wax moth)

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Sugars , 4 types, 12 molecules

#3: Polysaccharide alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-3)-alpha-D- ...alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-3)-alpha-D-mannopyranose-(1-6)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 1235.105 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpa1-2DManpa1-3[DManpa1-3DManpa1-6]DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-Glycam Condensed SequenceGMML 1.0
WURCS=2.0/3,7,6/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5][a1122h-1a_1-5]/1-1-2-3-3-3-3/a4-b1_b4-c1_c3-d1_c6-f1_d2-e1_f3-g1WURCSPDB2Glycan 1.1.0
[]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{[(3+1)][a-D-Manp]{[(2+1)][a-D-Manp]{}}[(6+1)][a-D-Manp]{[(3+1)][a-D-Manp]{}}}}}}LINUCSPDB-CARE
#4: Polysaccharide alpha-D-mannopyranose-(1-3)-alpha-D-mannopyranose-(1-6)-[alpha-D-mannopyranose-(1-3)]beta-D- ...alpha-D-mannopyranose-(1-3)-alpha-D-mannopyranose-(1-6)-[alpha-D-mannopyranose-(1-3)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 1072.964 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpa1-3DManpa1-6[DManpa1-3]DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-Glycam Condensed SequenceGMML 1.0
WURCS=2.0/3,6,5/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5][a1122h-1a_1-5]/1-1-2-3-3-3/a4-b1_b4-c1_c3-d1_c6-e1_e3-f1WURCSPDB2Glycan 1.1.0
[]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{[(3+1)][a-D-Manp]{}[(6+1)][a-D-Manp]{[(3+1)][a-D-Manp]{}}}}}}LINUCSPDB-CARE
#5: Polysaccharide alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-6)]beta-D- ...alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-6)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 1072.964 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpa1-2DManpa1-3[DManpa1-6]DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-Glycam Condensed SequenceGMML 1.0
WURCS=2.0/3,6,5/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5][a1122h-1a_1-5]/1-1-2-3-3-3/a4-b1_b4-c1_c3-d1_c6-f1_d2-e1WURCSPDB2Glycan 1.1.0
[]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{[(3+1)][a-D-Manp]{[(2+1)][a-D-Manp]{}}[(6+1)][a-D-Manp]{}}}}}LINUCSPDB-CARE
#6: Polysaccharide beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta- ...beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 586.542 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-Glycam Condensed SequenceGMML 1.0
WURCS=2.0/2,3,2/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5]/1-1-2/a4-b1_b4-c1WURCSPDB2Glycan 1.1.0
[]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{}}}}LINUCSPDB-CARE

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Non-polymers , 2 types, 2110 molecules

#7: Chemical ChemComp-CU / COPPER (II) ION / Copper


Mass: 63.546 Da / Num. of mol.: 3 / Source method: obtained synthetically / Formula: Cu / Feature type: SUBJECT OF INVESTIGATION
#8: Water ChemComp-HOH / water / Water


Mass: 18.015 Da / Num. of mol.: 2107 / Source method: isolated from a natural source / Formula: H2O

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Details

Has ligand of interestY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: Cibeles-Demetra heterocomplex / Type: COMPLEX
Details: Complex of two trimeric rings of Cibeles and Demetra
Entity ID: #1-#2 / Source: NATURAL
Molecular weightExperimental value: NO
Source (natural)Organism: Galleria mellonella (greater wax moth)
Source (recombinant)Organism: Escherichia coli (E. coli) / Strain: C41(DE3) / Plasmid: 2-Cc-T vector (pET derived vector)
Buffer solutionpH: 7.5
Buffer component
IDConc.NameFormulaBuffer-ID
120 mMHEPESHEPES1
250 mMSodium chlorideNaClSodium chloride1
30.5 %GlycerolGlycerol1
40.015 %Nonidet P-40NP-401
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportDetails: 25 mA / Grid material: COPPER / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R2/1
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 298 K

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELDBright-field microscopy / Nominal defocus max: 2600 nm / Nominal defocus min: 1100 nm / Cs: 2.7 mm
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingAverage exposure time: 5.5 sec. / Electron dose: 58.3 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Num. of real images: 6386
Details: Images were collected in super-resolution mode (pixel size of 0.543 angstrom)

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Processing

SoftwareName: PHENIX / Version: 1.19.2_4158: / Classification: refinement
EM software
IDNameVersionCategory
1RELION3.1particle selection
2EPUimage acquisition
4Gctf1.06CTF correction
7Coot0.9.8model fitting
9RELION3.1initial Euler assignment
10RELION3.1final Euler assignment
11RELION3.1classification
12RELION3.13D reconstruction
13PHENIX1.19model refinement
Image processingDetails: Super-resolution counting mode
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 1826686 / Details: Autopicking from relion_3.1 with two templates
SymmetryPoint symmetry: C3 (3 fold cyclic)
3D reconstructionResolution: 2.29 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 152240 / Num. of class averages: 3 / Symmetry type: POINT
Atomic model buildingB value: 45.533 / Protocol: AB INITIO MODEL / Space: REAL
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00236591
ELECTRON MICROSCOPYf_angle_d0.4349803
ELECTRON MICROSCOPYf_dihedral_angle_d11.04313620
ELECTRON MICROSCOPYf_chiral_restr0.0395229
ELECTRON MICROSCOPYf_plane_restr0.0046315

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