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- EMDB-18212: Cryo-EM structure of Adenovirus C5 hexon -

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Basic information

Entry
Database: EMDB / ID: EMD-18212
TitleCryo-EM structure of Adenovirus C5 hexon
Map data
Sample
  • Complex: Ternary complex of adenovirus C5 hexon polypeptides
    • Protein or peptide: Hexon protein
Keywordscapsid protein / trimer / VIRUS
Function / homology
Function and homology information


T=25 icosahedral viral capsid / microtubule-dependent intracellular transport of viral material towards nucleus / viral capsid / symbiont entry into host cell / host cell nucleus / structural molecule activity
Similarity search - Function
Adenovirus Pll, hexon, subdomain 2 / Adenovirus hexon protein / Adenovirus Pll, hexon, N-terminal / Adenovirus Pll, hexon, C-terminal / Hexon, adenovirus major coat protein, N-terminal domain / Hexon, adenovirus major coat protein, C-terminal domain / Group II dsDNA virus coat/capsid protein
Similarity search - Domain/homology
Biological speciesHuman adenovirus 5
Methodsingle particle reconstruction / cryo EM / Resolution: 2.9 Å
AuthorsZoll S / Dhillon A
Funding support Czech Republic, 1 items
OrganizationGrant numberCountry
Not funded Czech Republic
CitationJournal: J Virol / Year: 2024
Title: Structural insights into the interaction between adenovirus C5 hexon and human lactoferrin.
Authors: Arun Dhillon / B David Persson / Alexander N Volkov / Hagen Sülzen / Alan Kádek / Petr Pompach / Sami Kereïche / Martin Lepšík / Katarina Danskog / Charlotte Uetrecht / Niklas Arnberg / Sebastian Zoll /
Abstract: Adenovirus (AdV) infection of the respiratory epithelium is common but poorly understood. Human AdV species C types, such as HAdV-C5, utilize the Coxsackie-adenovirus receptor (CAR) for attachment ...Adenovirus (AdV) infection of the respiratory epithelium is common but poorly understood. Human AdV species C types, such as HAdV-C5, utilize the Coxsackie-adenovirus receptor (CAR) for attachment and subsequently integrins for entry. CAR and integrins are however located deep within the tight junctions in the mucosa where they would not be easily accessible. Recently, a model for CAR-independent AdV entry was proposed. In this model, human lactoferrin (hLF), an innate immune protein, aids the viral uptake into epithelial cells by mediating interactions between the major capsid protein, hexon, and yet unknown host cellular receptor(s). However, a detailed understanding of the molecular interactions driving this mechanism is lacking. Here, we present a new cryo-EM structure of HAdV-5C hexon at high resolution alongside a hybrid structure of HAdV-5C hexon complexed with human lactoferrin (hLF). These structures reveal the molecular determinants of the interaction between hLF and HAdV-C5 hexon. hLF engages hexon primarily its N-terminal lactoferricin (Lfcin) region, interacting with hexon's hypervariable region 1 (HVR-1). Mutational analyses pinpoint critical Lfcin contacts and also identify additional regions within hLF that critically contribute to hexon binding. Our study sheds more light on the intricate mechanism by which HAdV-C5 utilizes soluble hLF/Lfcin for cellular entry. These findings hold promise for advancing gene therapy applications and inform vaccine development.
IMPORTANCE: Our study delves into the structural aspects of adenovirus (AdV) infections, specifically HAdV-C5 in the respiratory epithelium. It uncovers the molecular details of a novel pathway where ...IMPORTANCE: Our study delves into the structural aspects of adenovirus (AdV) infections, specifically HAdV-C5 in the respiratory epithelium. It uncovers the molecular details of a novel pathway where human lactoferrin (hLF) interacts with the major capsid protein, hexon, facilitating viral entry, and bypassing traditional receptors such as CAR and integrins. The study's cryo-EM structures reveal how hLF engages hexon, primarily through its N-terminal lactoferricin (Lfcin) region and hexon's hypervariable region 1 (HVR-1). Mutational analyses identify critical Lfcin contacts and other regions within hLF vital for hexon binding. This structural insight sheds light on HAdV-C5's mechanism of utilizing soluble hLF/Lfcin for cellular entry, holding promise for gene therapy and vaccine development advancements in adenovirus research.
History
DepositionAug 16, 2023-
Header (metadata) releaseAug 30, 2023-
Map releaseAug 30, 2023-
UpdateMar 27, 2024-
Current statusMar 27, 2024Processing site: PDBe / Status: Released

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Structure visualization

Supplemental images

emd_18212.png

Downloads & links

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Map

FileDownload / File: emd_18212.map.gz / Format: CCP4 / Size: 103 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Voxel sizeX=Y=Z: 0.828 Å
Density
Contour LevelBy AUTHOR: 0.236
Minimum - Maximum-0.24262306 - 0.89521796
Average (Standard dev.)0.005033293 (±0.04291808)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions300300300
Spacing300300300
CellA=B=C: 248.40001 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #1

Fileemd_18212_half_map_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #2

Fileemd_18212_half_map_2.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
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Histogram

Histogram (log scale)

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Sample components

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Entire : Ternary complex of adenovirus C5 hexon polypeptides

EntireName: Ternary complex of adenovirus C5 hexon polypeptides
Components
  • Complex: Ternary complex of adenovirus C5 hexon polypeptides
    • Protein or peptide: Hexon protein

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Supramolecule #1: Ternary complex of adenovirus C5 hexon polypeptides

SupramoleculeName: Ternary complex of adenovirus C5 hexon polypeptides / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Human adenovirus 5
Molecular weightTheoretical: 324 KDa

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Macromolecule #1: Hexon protein

MacromoleculeName: Hexon protein / type: protein_or_peptide / ID: 1 / Number of copies: 3 / Enantiomer: LEVO
Source (natural)Organism: Human adenovirus 5
Molecular weightTheoretical: 108.107617 KDa
SequenceString: MATPSMMPQW SYMHISGQDA SEYLSPGLVQ FARATETYFS LNNKFRNPTV APTHDVTTDR SQRLTLRFIP VDREDTAYSY KARFTLAVG DNRVLDMAST YFDIRGVLDR GPTFKPYSGT AYNALAPKGA PNPCEWDEAA TALEINLEEE DDDNEDEVDE Q AEQQKTHV ...String:
MATPSMMPQW SYMHISGQDA SEYLSPGLVQ FARATETYFS LNNKFRNPTV APTHDVTTDR SQRLTLRFIP VDREDTAYSY KARFTLAVG DNRVLDMAST YFDIRGVLDR GPTFKPYSGT AYNALAPKGA PNPCEWDEAA TALEINLEEE DDDNEDEVDE Q AEQQKTHV FGQAPYSGIN ITKEGIQIGV EGQTPKYADK TFQPEPQIGE SQWYETEINH AAGRVLKKTT PMKPCYGSYA KP TNENGGQ GILVKQQNGK LESQVEMQFF STTEATAGNG DNLTPKVVLY SEDVDIETPD THISYMPTIK EGNSRELMGQ QSM PNRPNY IAFRDNFIGL MYYNSTGNMG VLAGQASQLN AVVDLQDRNT ELSYQLLLDS IGDRTRYFSM WNQAVDSYDP DVRI IENHG TEDELPNYCF PLGGVINTET LTKVKPKTGQ ENGWEKDATE FSDKNEIRVG NNFAMEINLN ANLWRNFLYS NIALY LPDK LKYSPSNVKI SDNPNTYDYM NKRVVAPGLV DCYINLGARW SLDYMDNVNP FNHHRNAGLR YRSMLLGNGR YVPFHI QVP QKFFAIKNLL LLPGSYTYEW NFRKDVNMVL QSSLGNDLRV DGASIKFDSI CLYATFFPMA HNTASTLEAM LRNDTND QS FNDYLSAANM LYPIPANATN VPISIPSRNW AAFRGWAFTR LKTKETPSLG SGYDPYYTYS GSIPYLDGTF YLNHTFKK V AITFDSSVSW PGNDRLLTPN EFEIKRSVDG EGYNVAQCNM TKDWFLVQML ANYNIGYQGF YIPESYKDRM YSFFRNFQP MSRQVVDDTK YKDYQQVGIL HQHNNSGFVG YLAPTMREGQ AYPANFPYPL IGKTAVDSIT QKKFLCDRTL WRIPFSSNFM SMGALTDLG QNLLYANSAH ALDMTFEVDP MDEPTLLYVL FEVFDVVRVH RPHRGVIETV YLRTPFSAGN ATT

UniProtKB: Hexon protein

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

BufferpH: 7.2
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeTFS KRIOS
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy / Nominal defocus max: 2.6 µm / Nominal defocus min: 1.2 µm
Image recordingFilm or detector model: GATAN K2 IS (4k x 4k) / Average electron dose: 55.0 e/Å2
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: INSILICO MODEL
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.9 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 53396
FSC plot (resolution estimation)

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