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- EMDB-48101: NCS.1 Fab in complex with N5 NA of A/shorebird/Delaware Bay/309/2... -

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Basic information

Entry
Database: EMDB / ID: EMD-48101
TitleNCS.1 Fab in complex with N5 NA of A/shorebird/Delaware Bay/309/2016 (DB16, H10N5) -- 3 Fabs
Map dataMain Map - Sharpened
Sample
  • Complex: NCS.1 Fab in complex with N5 NA of A/shorebird/Delaware Bay/309/2016 (DB16, H10N5) -- 3 Fabs
    • Protein or peptide: Neuraminidase
    • Protein or peptide: NCS.1 Heavy Chain
    • Protein or peptide: NCS.1 Light Chain
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose
  • Ligand: CALCIUM ION
KeywordsNeuraminidase / NCS.1 / Tetramer / Antibody / Fab / N5 / H10N5 / DB6 / Apo / VIRAL PROTEIN
Function / homology
Function and homology information


exo-alpha-sialidase / exo-alpha-sialidase activity / viral budding from plasma membrane / carbohydrate metabolic process / host cell plasma membrane / virion membrane / metal ion binding / membrane
Similarity search - Function
Sialidase, Influenza viruses A/B / Glycoside hydrolase, family 34 / Neuraminidase / Sialidase superfamily
Similarity search - Domain/homology
Biological speciesHomo sapiens (human) / Influenza A virus
Methodsingle particle reconstruction / cryo EM / Resolution: 4.18 Å
AuthorsBorst AJ
Funding support United States, 1 items
OrganizationGrant numberCountry
Bill & Melinda Gates Foundation United States
CitationJournal: Nat Commun / Year: 2025
Title: Structural convergence and water-mediated substrate mimicry enable broad neuraminidase inhibition by human antibodies.
Authors: Julia Lederhofer / Andrew J Borst / Lam Nguyen / Rebecca A Gillespie / Connor J Williams / Emma L Walker / Julie E Raab / Christina Yap / Daniel Ellis / Adrian Creanga / Hyon-Xhi Tan / Thi H ...Authors: Julia Lederhofer / Andrew J Borst / Lam Nguyen / Rebecca A Gillespie / Connor J Williams / Emma L Walker / Julie E Raab / Christina Yap / Daniel Ellis / Adrian Creanga / Hyon-Xhi Tan / Thi H T Do / Michelle Ravichandran / Adrian B McDermott / Valerie Le Sage / Sarah F Andrews / Barney S Graham / Adam K Wheatley / Douglas S Reed / Neil P King / Masaru Kanekiyo /
Abstract: Influenza has been responsible for multiple global pandemics and seasonal epidemics and claimed millions of lives. The imminent threat of a panzootic outbreak of avian influenza H5N1 virus ...Influenza has been responsible for multiple global pandemics and seasonal epidemics and claimed millions of lives. The imminent threat of a panzootic outbreak of avian influenza H5N1 virus underscores the urgent need for pandemic preparedness and effective countermeasures, including monoclonal antibodies (mAbs). Here, we characterize human mAbs that target the highly conserved catalytic site of viral neuraminidase (NA), termed NCS mAbs, and the molecular basis of their broad specificity. Cross-reactive NA-specific B cells were isolated by using stabilized NA probes of non-circulating subtypes. We found that NCS mAbs recognized multiple NAs of influenza A as well as influenza B NAs and conferred prophylactic protections in mice against H1N1, H5N1, and influenza B viruses. Cryo-electron microscopy structures of two NCS mAbs revealed that they rely on structural mimicry of sialic acid, the substrate of NA, by coordinating not only amino acid side chains but also water molecules, enabling inhibition of NA activity across multiple influenza A and B viruses, including avian influenza clade 2.3.4.4b H5N1 viruses. Our results provide a molecular basis for the broad reactivity and inhibitory activity of NCS mAbs targeting the catalytic site of NA through substrate mimicry.
History
DepositionNov 27, 2024-
Header (metadata) releaseAug 13, 2025-
Map releaseAug 13, 2025-
UpdateAug 13, 2025-
Current statusAug 13, 2025Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_48101.png

Downloads & links

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Map

FileDownload / File: emd_48101.map.gz / Format: CCP4 / Size: 125 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationMain Map - Sharpened
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.16 Å/pix.
x 320 pix.
= 371.2 Å		1.16 Å/pix.
x 320 pix.
= 371.2 Å		1.16 Å/pix.
x 320 pix.
= 371.2 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.16 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.121
Minimum - Maximum-0.453514 - 0.8505769
Average (Standard dev.)0.00048264666 (±0.021972062)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions320320320
Spacing320320320
CellA=B=C: 371.19998 Å
α=β=γ: 90.0 °

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Supplemental data

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Additional map: Unsharpened

Fileemd_48101_additional_1.map
AnnotationUnsharpened
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Additional map: DeepEMhanced

Fileemd_48101_additional_2.map
AnnotationDeepEMhanced
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Half A

Fileemd_48101_half_map_1.map
AnnotationHalf A
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Half B

Fileemd_48101_half_map_2.map
AnnotationHalf B
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : NCS.1 Fab in complex with N5 NA of A/shorebird/Delaware Bay/309/2...

EntireName: NCS.1 Fab in complex with N5 NA of A/shorebird/Delaware Bay/309/2016 (DB16, H10N5) -- 3 Fabs
Components
  • Complex: NCS.1 Fab in complex with N5 NA of A/shorebird/Delaware Bay/309/2016 (DB16, H10N5) -- 3 Fabs
    • Protein or peptide: Neuraminidase
    • Protein or peptide: NCS.1 Heavy Chain
    • Protein or peptide: NCS.1 Light Chain
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose
  • Ligand: CALCIUM ION

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Supramolecule #1: NCS.1 Fab in complex with N5 NA of A/shorebird/Delaware Bay/309/2...

SupramoleculeName: NCS.1 Fab in complex with N5 NA of A/shorebird/Delaware Bay/309/2016 (DB16, H10N5) -- 3 Fabs
type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#3
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: Neuraminidase

MacromoleculeName: Neuraminidase / type: protein_or_peptide / ID: 1 / Number of copies: 4 / Enantiomer: LEVO / EC number: exo-alpha-sialidase
Source (natural)Organism: Influenza A virus
Molecular weightTheoretical: 43.432891 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: EFLNNTEPLC NVSGFAIVSK DNGIRIGSRG HVFVIREPFV ACGPTECRTF FLTQGALLND KHSNNTVKDR SPYRALMSVP LGSSPNAYQ AKFESVAWSA TACHDGKRWL AVGISGADDD AYAVIHYGGM PTDVVRSWRK QILRTQESSC VCMKGNCYWV M TDGPANSQ ...String:
EFLNNTEPLC NVSGFAIVSK DNGIRIGSRG HVFVIREPFV ACGPTECRTF FLTQGALLND KHSNNTVKDR SPYRALMSVP LGSSPNAYQ AKFESVAWSA TACHDGKRWL AVGISGADDD AYAVIHYGGM PTDVVRSWRK QILRTQESSC VCMKGNCYWV M TDGPANSQ ASYKIFKSHK GMVTNEREVS FQGGHIEECS CYPNLGKVEC VCRDNWNGMN RPVLTFDEDL NYEVGYLCAG IP TDTPRVQ DNSFIGSCTN AVGGSGTNNY GVKGFGFRQG NSVWAGRTVS ISSRSGFEIL LVEDGWVKTS KNVVKKVEVL NNK NWSGYS GAFTIPITMT SKQCLVPCFW LEMIRGKPEE RTSIWTSSSS TVFCGVSSEV PGWSWDDGAI LPFDIDKM

UniProtKB: Neuraminidase

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Macromolecule #2: NCS.1 Heavy Chain

MacromoleculeName: NCS.1 Heavy Chain / type: protein_or_peptide / ID: 2 / Number of copies: 3 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 14.054567 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString:
QVQLPESGPR LVKPSETLSL TCSVSGESIS SGGYYWTWIR QHPGKGLEWI GNIFDTGSTH YSPSLKTRLT ISIDTSKNQF YLRLNSATA ADTAVYYCAR VGYSLETDRP YYFGLDVWGQ GTTVTVSS

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Macromolecule #3: NCS.1 Light Chain

MacromoleculeName: NCS.1 Light Chain / type: protein_or_peptide / ID: 3 / Number of copies: 3 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 12.264772 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString:
DIVMTQSPLS LPVTPGEPAS ISCRSSQSLL HSNGYTYLDW YLQKPGQSPQ LLIYLASNRA SGVPDRFSGS GSGTYFTLKI SRVEAEDVG VYYCMQAVQT PWTFGQGTKV EIK

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Macromolecule #5: 2-acetamido-2-deoxy-beta-D-glucopyranose

MacromoleculeName: 2-acetamido-2-deoxy-beta-D-glucopyranose / type: ligand / ID: 5 / Number of copies: 4 / Formula: NAG
Molecular weightTheoretical: 221.208 Da
Chemical component information

ChemComp-NAG:
2-acetamido-2-deoxy-beta-D-glucopyranose

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Macromolecule #6: CALCIUM ION

MacromoleculeName: CALCIUM ION / type: ligand / ID: 6 / Number of copies: 4 / Formula: CA
Molecular weightTheoretical: 40.078 Da

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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: 7.4
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeTFS GLACIOS
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Average electron dose: 50.0 e/Å2
Electron beamAcceleration voltage: 200 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.0 µm / Nominal defocus min: 1.0 µm

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Image processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: INSILICO MODEL / In silico model: Ab initio
Final reconstructionResolution.type: BY AUTHOR / Resolution: 4.18 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 75643
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
FSC plot (resolution estimation)

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