Journal: medRxiv

Article Title: multiSero: open multiplex-ELISA platform for analyzing antibody responses to SARS-CoV-2 infection

doi: 10.1101/2021.05.07.21249238

Figure Lengend Snippet: (A) Image of well containing Scienion-printed antigen array. Array layout shows the relative locations of SARS-CoV-2 antigens included in the array: receptor binding domain of spike-RBD (RBD; green), spike (ochre), and nucleoprotein (N; pink). Each antigen was spotted at two concentrations which are indicated in the right panel of the layout. Black spots represent anti-kappa-biotin fiducials, mauve spots represent anti-IgG Fc, and grey spots represent GFP foldon. (B) Pysero first detects center points of all spots in the cropped image (red x). Fiducial positions (blue +) are initialized based on detected spot coordinates. Coordinate transformation that registers the initial fiducials with detected fiducials is estimated using particle filtering. A grid containing all spot locations (green) in the antigen layout is then transformed onto the image using the estimated coordinate transformation. The coordinates of each spot are then used to crop individual spots and extract their OD. (C) Comparison of Scienion analysis and pysero spot detection. Original image of a well imaged by SciREADER CL2 includes comets (white arrow) and fiber-like debris. Center image is the output of Scienion spot detection and analysis. A black spot indicates an analyte-containing spot was not found at the location, green spots indicate positive spot value, and blue spots indicate the location of fiducial spots. The size of the spot indicates the area analyzed by Scienion. Right image is the output of pysero. Green dots indicate registered grid positions (size of marker unrelated to area analyzed), blue crosses indicate initialized fiducial spots.

Article Snippet: Sample was aspirated and wells incubated for 1 hour with 100 uL of an even mixture of biotinylated goat antibodies targeting the kappa (25 ng mL −1 , Southern Biotech cat. 2070-08) and lambda (25 ng mL −1 Southern Biotech cat. 2060-08) light chains.

Techniques: Binding Assay, Transformation Assay, Marker

Journal: bioRxiv

Article Title: Profiling Allogeneic HLA-specific B-cell Responses Utilizing a 64-plex Single-HLA Reporter Cell Panel

doi: 10.64898/2026.01.19.700453

Figure Lengend Snippet: The HLA64-RC panel was labeled with fluorochrome-conjugated Abs or with unconjugated primary Abs followed by fluorochrome-conjugated secondary Abs. Following flow cytometry acquisition, data were analyzed using FlowJo ™ software. Live cell events were demultiplexed into 64 populations based on the six FP channels as in . Stacked histograms of the demultiplexed populations show fluorescence intensities corresponding to Ab labeling. Histograms are grouped by HLA-A (dark red), HLA-B (green), HLA-DQ (blue), and HLA-DR (purple) alleles, displayed upward in the order indicated on the far-right. Blue labels positioned in the upper-right (top row) or lower-right (bottom row) corners denote the reported specificities of the corresponding mAbs. hIgG1K and hIgG1L, human IgG1κ and IgG1λ isotype control Abs. BB7.2-hIgG1K, BB7.2 in human IgG1κ format. Anti-hIgG-PE and anti-mIgG-PE, PE-conjugated anti-human or anti-mouse IgG secondary Abs. SA-PE, PE-conjugated streptavidin.

Article Snippet: Following three additional washes, a cocktail of HRP-conjugated anti-human Igκ (Southern Biotech, 2061-05) and anti-human Igλ (Southern Biotech, 2071-05) Abs was added.

Techniques: Labeling, Flow Cytometry, Software, Fluorescence, Control

Journal: bioRxiv

Article Title: Profiling Allogeneic HLA-specific B-cell Responses Utilizing a 64-plex Single-HLA Reporter Cell Panel

doi: 10.64898/2026.01.19.700453

Figure Lengend Snippet: Using the HLA64-RC panel, ten serum samples (#01–#10) from sensitized transplant candidates were tested for HLA-binding activities at 1/3 serial dilutions from 1:2 to 1:486, followed by secondary labeling using PE-conjugated anti-human IgG at 2 µg/ml. Raw binding data are shown in Supplementary Document 1. The dilutions yielding the highest signal-to-background ratio for individual samples were selected and MFI values (Supplementary Data 3) were compared with those obtained from clinical SAB assays (Supplementary Data 4) using the same samples. a) Heatmaps comparing log 10 (MFI) values for shared alleles between the HLA64-RC and SAB assays. The selected dilutions for the HLA64-RC assay were indicated in parentheses. For the SAB assay, serum samples were tested neat. Alleles with MFI values below the binding threshold (see Methods) are shown in grey. Reactivities detected by the HLA64-RC assay but absent in the SAB assay are highlighted with blue boxes. b) Dot plots comparing log 10 (MFI) values for shared alleles between the HLA64-RC and SAB assays, as in ( a ). Data from multiple samples were pooled and plotted separately for HLA-A, -B, -DQ, and -DR loci, with color and shape indicating individual alleles within each locus. For consistency, only serum samples tested at 1:2 dilution in the HLA64-RC assay in ( a ) were included. Within each locus, Lin’s CCC with 95% bootstrap confidence interval (CI), Spearman correlation, and SMA regression with 95% bootstrap CI were calculated using log 10 (MFI) values from the two assays. Solid diagonal lines represent SMA regression fits; dotted lines indicate the 95% CI.

Article Snippet: Following three additional washes, a cocktail of HRP-conjugated anti-human Igκ (Southern Biotech, 2061-05) and anti-human Igλ (Southern Biotech, 2071-05) Abs was added.

Techniques: Binding Assay, Labeling

Journal: bioRxiv

Article Title: Profiling Allogeneic HLA-specific B-cell Responses Utilizing a 64-plex Single-HLA Reporter Cell Panel

doi: 10.64898/2026.01.19.700453

Figure Lengend Snippet: HLA monomer-binding single B-cell culture supernatants were screened using the HLA64-RC assay. R952-X06 and R952-X08 to -X12 cultures were derived from phenotyping antibody Panel 1 mediated sorting, and the rest from Panel 2 sorting. Secondary labeling was performed using PE-conjugated anti-human IgG (2 μg/ml). Flow cytometry data were analyzed and visualized using the HLA64 R package, and MFI values were exported (Supplementary Data 5). Demultiplexed HLA alleles corresponding to individual reporter cell populations are indicated on the right. Data are shown for HLA-specific cultures, and only HLA-A and -B loci are plotted. Human IgG1κ (hIgG1K), W6/32 in human IgG1κ format (W6/32-hIgG1K), and a no-B-cell culture supernatant were included as labeling controls. Populations exceeding the binding threshold (see Methods) relative to the no-Bcell control were automatically highlighted in red.

Article Snippet: Following three additional washes, a cocktail of HRP-conjugated anti-human Igκ (Southern Biotech, 2061-05) and anti-human Igλ (Southern Biotech, 2071-05) Abs was added.

Techniques: Binding Assay, Cell Culture, Derivative Assay, Labeling, Flow Cytometry, Control

Journal: Antibodies

Article Title: Balancing the Affinity and Tumor Cell Binding of a Two-in-One Antibody Simultaneously Targeting EGFR and PD-L1

doi: 10.3390/antib13020036

Figure Lengend Snippet: HCP-LCE light chain NNS yeast surface display library generation and sorting. ( A ) Schematic representation of the EGFR and PD-L1 binding Two-in-One antibody HCP-LCE. ( B ) Schematic representation of the cloning procedure for YSD library generation. Single amino acids of LCDR1 and LCDR3 were substituted with a codon encoding for the 20 naturally occurring amino acids. The light chain diversity was combined with the wildtype HCP-LCE heavy chain by yeast mating. Created with BioRender.com (accessed on 11 January 2024) ( C ) Sorting of the diploid HCP-LCE light chain mutant YSD library via FACS. Surface presentation is depicted on the y-axis utilizing the anti-human lambda chain antibody AF647- or PE-labeled, while EGFR-Fc or EGFR-His binding is shown on the x-axis using the anti-human Fc PE antibody or the anti-6xHis AF647 antibody, respectively.

Article Snippet: Following a PBS-B wash, the cells were incubated with a goat anti-human-Lambda AF647-conjugated F(ab’)2 antibody (SouthernBiotech, Birmingham, AL, USA, diluted 1:75) to detect Fab surface presentation and an anti-human IgG Fc PE-conjugated antibody (Thermo Fisher Scientific, Waltham, MA, USA, diluted 1:50) to detect target binding or with a goat anti-human–Lambda PE-conjugated F(ab’)2 antibody (SouthernBiotech, diluted 1:75) and a 6xHis-Tag AF647-conjugated antibody (Thermo Fisher Scientific, diluted 1:75) for 15 min on ice.

Techniques: Binding Assay, Cloning, Mutagenesis, Labeling

Journal: Cell reports

Article Title: Crimean-Congo hemorrhagic fever survivors elicit protective non-neutralizing antibodies that target 11 overlapping regions on glycoprotein GP38

doi: 10.1016/j.celrep.2024.114502

Figure Lengend Snippet: KEY RESOURCES TABLE

Article Snippet: Goat F(ab')2 Anti-Human Lambda FITC , SouthernBiotech , Cat. #2072-02; RRID: AB_2795767.

Techniques: Derivative Assay, Virus, Recombinant, Protease Inhibitor, Reverse Transcription, Membrane, Cell Isolation, Mutagenesis, Expressing, Plasmid Preparation, Software, Affinity Column, Sequencing, Transfection, Electron Microscopy