(A) Single cell-sorted B cells were subjected to two processes: Ig-seq database building and Ig-expressing transformant library preparation. Antigen-binding Ig transformants were collected by …
Overview of heavy (V–D–J) and light (V–J) chain usages (A), and the repertoire clonality (B) is shown. (C) The mutation rates and their positions of heavy chains in three cell populations (PR8+, …
The process for efficiently isolating influenza cross-reactive antibodies from mouse germinal center B cells with high affinity is shown. Experiment outcome flow numbers of clones in each step are …
CD43 MACS B cells from the spleen purified using negatively charged beads were sorted for IgG1 + cells and then separated into H2 and PR8. The majority of cross-reactive IgG1 + cells (red box) were …
(A) Mixture of Ig-expressing transformant libraries stained with HA probes. (B) Three strong HA-binding populations, H1+H2+ (cross), H2+ (H2), and H1+ (H1), were sorted and collected in a bulk …
Nine mAb clones are overlaid in green. Six ‘cross’ clones are located in a major cluster. B10p2 and C10p2 are co-localized and distant from the cluster. A6p4 is uniquely located in the map.
On the right panel, two stem-reactive clones (see Table 1) were examined reciprocally with combination of transformant and recombinant antibodies.
H2, PR8, Cal, and H5 belong to group 1, and H3 belongs to group 2. High (red), Middle (orange), and Low (blue).
Group | 1 | 1 | 1 | 2 | 1 | 1 |
---|---|---|---|---|---|---|
H2 | PR8 | Cal | H3 | H5 | Stem | |
A6p4 | 4.51E-08 | 1.41E-06 | 1.14E-05 | 2.91E-05 | 1.59E-08 | |
B10p2 | 6.75E-09 | 2.3E-09 | 3.29E-09 | |||
C10p2 | 1.66E-09 | 1.29E-09 | 5.66E-10 | 4.26E-08 | ||
A2p1 | 2.49E-06 | 1.42E-07 | 1.14E-05 | 1.25E-04 | 1.91E-05 | |
D11p4 | 7.93E-07 | 1.72E-06 | 1.04E-06 | 1.36E-05 | 1.05E-11* | |
E11p2 | 4.4E-08 | 1.86E-08 | 1.67E-06 | 2.92E-07 | 2.37E-07 | |
G6p2 | 3.51E-08 | 3.53E-08 | 1.44E-08 | 1.78E-05 | 3.05E-08 | |
D4p4 | 1.1E-05 | 1.78E-05 | 6.4E-05 | 4.38E-05 | 2.47E-05 | |
G12p4 | 1.45E-07 | 1.52E-07 | 5.7E-07 | 9.44E-07 | 1.58E-07 |
Surface plasmon resonance (Biacore) KD (M).
The affinity of D11p4 for H5 was low and inaccurate (Figure 2—figure supplement 1).
Reagent type (species) or resource | Designation | Source or reference | Identifiers | Additional information |
---|---|---|---|---|
Gene (Aequorea coerulescens) | venus | RIKEN BRC; Nagai et al., 2002 | ||
Strain, strain background (Escherichia coli) | DH5α | Thermo Fisher Scientific | EC0112 | competent cells |
Genetic reagent (F’ Episome) | ccdB | Thermo Fisher Scientific | V79020 | pcDNA3.1 (+) Mammalian Expression Vector |
Cell line (Homo sapiens) | FreeStyle 293 | Thermo Fisher Scientific | R79007 | |
Transfected construct (M. musculus) | Antibody expression vector | This paper | Plasmid construct to transfect and express the antibody. | |
Biological sample (M. musculus) | Mouse splenocytes | This paper | CLEA Japan, Inc. | |
Antibody | Anti-CD43 MicroBeads (Mouse monoclonal) | Miltenyi Biotec, Inc. | 130-049-801 | Add 10 μL of Anti-CD43 (Ly-48) MicroBeads (mouse) per 10⁷ total cells (1:1000 dilution) |
Recombinant DNA reagent | pcDNA3.4-mIgG1 (plasmid) | This paper | To obtain a large amount of secretory antibodies | |
Recombinant DNA reagent | pcDNA3.4-kappa (plasmid) | This paper | To obtain a large amount of secretory antibodies | |
Sequence-based reagent | BsaI_IL6sp_L | This paper | PCR primers | CTAGGGTCTCAAGCAGATGAACTCCTTCTCCACAAGCG |
Sequence-based reagent | mC_G_new2_BsaI | This paper | PCR primers | TCCTAGGTCTCCCACACACAGGGGCCAGTGGATAGAC |
Peptide, recombinant protein | Anti-HA antibodies | This paper | Nine cross reactive antibodies | |
Commercial assay or kit | BsaI-HFv2 | New England Biolabs | NEB #R3733 | |
Commercial assay or kit | T4 DNA ligase | New England Biolabs | M0202T | |
Chemical compound, drug | AddaVax | InvivoGen | vac-adx-10 | adjuvant |
Software, algorithm | BONSCI | in-house software | Ig database construction and visualization of the Ig repertoire | |
Other | CM5 sensor chip | GE Healthcare Technologies | BR100530 | 3 sensor chips |
Supplementary tables.
(a) Oligonucleotides. (b) Oligonucleotides.