Cited by 85Monoclonal and Polyclonal Antibodies ResearchT-cell and B-cell ImmunologyReceptor Mechanisms and Signaling

Human Fc Receptor–Like 5 Binds Intact IgG via Mechanisms Distinct from Those of Fc Receptors

Open access
Franco, Andrea, Damdinsuren, Bazarragchaa, Ise, Tomoko, Dement-Brown, Jessica, Li, Huifang, Nagata, Satoshi, Tolnay, Mate·2013·The Journal of Immunology

Abstract

Fc receptor–like (FCRL) 5 regulates B cell Ag receptor signaling and has been reported to bind aggregated IgG. Using surface plasmon resonance, we analyzed the interaction of native IgG samples with FCRL5, revealing a complex binding mechanism, where isotype is just one factor. FCRL5 bound IgG1 and IgG4 with ∼1 μM KD, whereas the interaction with IgG3 was a magnitude weaker. However, IgG2 samples displayed a wide range of affinities, indicating that additional factors affect binding. We used a panel of 19 anti-FCRL5 mAbs with defined reactivity to identify domains involved in ligand binding. Six mAbs blocked IgG binding, indicating critical roles of FCRL5 domains 1 and 3, as well as epitopes at the domain 1/2 and domain 2/3 boundaries. We found that only glycosylated IgG containing both Fab arms and the Fc region bound with high affinity. Furthermore, the presence of sialic acid in the IgG carbohydrate altered FCRL5 binding. The interaction of IgG and FCRL5 consisted of two kinetic components, suggesting a complex binding mechanism. We established that the IgG-Fc and IgG-F(ab′)2 fragments bind FCRL5 independently but with low affinity, revealing the mechanism behind the two-step binding of whole IgG. This complex binding mechanism is distinct from that of Fc receptors, which bind through the Fc. We propose that FCRL5 is a new type of receptor that recognizes intact IgG, possibly enabling B cells to sense Ig quality. Recognition of undamaged IgG molecules by FCRL5 could allow B cells to engage recently produced Abs.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.4049/jimmunol.1202860

Cites

45 of 45 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Franco, A., Damdinsuren, B., Ise, T., Dement-Brown, J., Li, H., Nagata, S., & Tolnay, M.
Affiliations
  • United States Food and Drug Administration (US)
  • Sanford Research (US)
  • Division of Monoclonal Antibodies, Center for Drug Evaluation and Research, Food and Drug Administration , Silver Spring, MD 20993
Corresponding author
  • Franco, Andrea
  • Damdinsuren, Bazarragchaa
  • Li, Huifang
Venue
The Journal of Immunology
Published
2013-06-01
Volume
190
Issue
11
Pages
5739-5746
ISSN
  • 0022-1767 (ISSN-L)
  • 1550-6606
OpenAlex
W2164793815
Cited by
85
References
45
Citations by year
2026: 11 · 2025: 2 · 2024: 8 · 2023: 10 · 2022: 3 · 2021: 7 · 2020: 12 · 2019: 4 · 2018: 4 · 2017: 4 · 2016: 7 · 2015: 5 · 2014: 7 · 2013: 1
FWCI
5.16
Type
journal article
Language
en
Open access
Locations
  • The Journal of Immunology (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health
  • National Center for Research Resources (P20RR024219)
Topics
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Monoclonal and Polyclonal Antibodies Research
  • Life Sciences › Immunology and Microbiology › Immunology › T-cell and B-cell Immunology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Receptor Mechanisms and Signaling
Keywords
FCRL5, IgG isotypes, B cell receptor signaling, sialic acid, IgG glycosylation, Fc fragment, F(ab')2 fragments, binding kinetics
MeSH terms
Antibody Affinity, Epitopes, Cell Line, Cell Membrane, Humans, Immunoglobulin G, Kinetics, Protein Binding, Receptors, Cell Surface, Receptors, Fc, Recombinant Proteins, Protein Interaction Domains and Motifs

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review