Evidence map›Paper›PMID 34782475›Full record

ArticleProceedings of the National Academy of Sciences of the United States of America2021

Development of a universal nanobody-binding Fab module for fiducial-assisted cryo-EM studies of membrane proteins.

Joël S Bloch, Somnath Mukherjee, Julia Kowal, Ekaterina V Filippova, Martina Niederer, Els Pardon, Jan Steyaert, Anthony A Kossiakoff, Kaspar P Locher

Open access · greenAbstract read
In one paragraph

Article in Proceedings of the National Academy of Sciences of the United States of America, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 76 papers.

0numbers the graph read from it
0cells of the map it votes in
76citing papers in PubMed
7.9field-weighted citation impact, top 2% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

76 citing papers in PubMed, 108 citations in OpenAlex.

  1. Structure and allostery in major facilitator superfamily symport mechanisms.Acta crystallographica. Section D, Structural biology · 2026
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  7. Visualization of the interaction between sphingomyelin and cholesterol in lipid bilayer membranes.Proceedings of the National Academy of Sciences of the United States of America · 2026
    Article
  8. Article
  9. Structural evolution of the MTCH family of mitochondrial insertases.bioRxiv : the preprint server for biology · 2026
    Article
  10. Review
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  12. Article
  13. Article
  14. Article
  15. Atypical GPCR Activation Resolved by Nanobody Engineering.bioRxiv : the preprint server for biology · 2026
    Article
  16. Review
  17. Hidden gems bring proteins into view.Nature chemical biology · 2026
    Article
  18. Article
  19. Review
  20. Review

16 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

9 authors at 3 institutions in 3 countries.

Joël S BlochInstitute of Molecular Biology and Biophysics, ETH Zürich, 8093 Zürich, Switzerland.ORCID 0000-0002-5786-0488
Somnath MukherjeeDepartment of Biochemistry and Molecular Biology, University of Chicago, Chicago, IL 60637.ORCID 0000-0001-5447-4496
Julia KowalInstitute of Molecular Biology and Biophysics, ETH Zürich, 8093 Zürich, Switzerland.ORCID 0000-0003-4694-1896
Ekaterina V FilippovaDepartment of Biochemistry and Molecular Biology, University of Chicago, Chicago, IL 60637.ORCID 0000-0001-6382-4929
Martina NiedererInstitute of Molecular Biology and Biophysics, ETH Zürich, 8093 Zürich, Switzerland.
Els PardonStructural Biology Brussels, Vrije Universiteit Brussel, B-1050 Brussels, Belgium.
Jan SteyaertStructural Biology Brussels, Vrije Universiteit Brussel, B-1050 Brussels, Belgium.
Anthony A KossiakoffDepartment of Biochemistry and Molecular Biology, University of Chicago, Chicago, IL 60637; koss@bsd.uchicago.edu locher@mol.biol.ethz.ch.
Kaspar P LocherInstitute of Molecular Biology and Biophysics, ETH Zürich, 8093 Zürich, Switzerland; koss@bsd.uchicago.edu locher@mol.biol.ethz.ch.ORCID 0000-0002-8207-2889
ETH Zurich · CHUniversity of Chicago · USVrije Universiteit Brussel · BE

Funding

User Training and OutreachP30GM124165 · NIGMS · CORNELL UNIVERSITY · PI Nozomi Ando, J Christopher Fromme · 2018 to 2026
$34.2M
Virus TransmissionP50AI150464 · NIAID · UNIVERSITY OF UTAH · PI SUNDQUIST, WESLEY I. · 2019 to 2021
$14.9M
Chaperone-Assisted Structure Determination of Membrane ProteinsR01GM117372 · NIGMS · UNIVERSITY OF CHICAGO · PI ANTHONY A KOSSIAKOFF · 2016 to 2026
$4.0M
Pixel Array Detector for Macromolecular CrystallographyS10OD021527 · OD · CORNELL UNIVERSITY · PI EALICK, STEVEN E · 2016 to 2016
$2.0M
NIAID NIH HHS P50 AI150464NIGMS NIH HHS P30 GM124165NIGMS NIH HHS R01 GM117372NIH HHS S10 OD021527
6 · The paper itself

Abstract

With conformation-specific nanobodies being used for a wide range of structural, biochemical, and cell biological applications, there is a demand for antigen-binding fragments (Fabs) that specifically and tightly bind these nanobodies without disturbing the nanobody-target protein interaction. Here, we describe the development of a synthetic Fab (termed NabFab) that binds the scaffold of an alpaca-derived nanobody with picomolar affinity. We demonstrate that upon complementary-determining region grafting onto this parent nanobody scaffold, nanobodies recognizing diverse target proteins and derived from llama or camel can cross-react with NabFab without loss of affinity. Using NabFab as a fiducial and size enhancer (50 kDa), we determined the high-resolution cryogenic electron microscopy (cryo-EM) structures of nanobody-bound VcNorM and ScaDMT, both small membrane proteins of ∼50 kDa. Using an additional anti-Fab nanobody further facilitated reliable initial three-dimensional structure determination from small cryo-EM test datasets. Given that NabFab is of synthetic origin, is humanized, and can be conveniently expressed in

Indexed as

AnimalsCamelids, New WorldCamelusCryoelectron MicroscopyImmunoglobulin Fab FragmentsMembrane ProteinsMicroscopy, ElectronModels, MolecularProtein BindingProtein ConformationSequence AlignmentSequence Analysis, ProteinSingle-Domain AntibodiesImmunoglobulin Fab FragmentsMembrane ProteinsSingle-Domain Antibodiesantibodycryogenic electron microscopymembrane proteinnanobodystructure

Identifiers

PMID34782475
PMCPMC8617411
OpenAlexW3211372884

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.