All lanes : Anti-CXCR5 antibody [EPR23463-30] (ab254415) at 1/1000 dilution

Lane 1 : Wild-type Raji cell lysate
Lane 2 : CXCR5 knockout Raji cell lysate
Lane 3 : Daudi cell lysate
Lane 4 : Jurkat cell lysate

Lysates/proteins at 30 µg per lane.

Performed under reducing conditions.

Predicted band size: 42 kDa
Observed band size: 60 kDa why is the actual band size different from the predicted?

Lanes 1 - 4: Merged signal (red and green). Green - ab254415 observed at 60 kDa. Red - loading control ab7291 (Mouse anti-Alpha Tubulin [DM1A]) observed at 55 kDa.

ab254415 was shown to react with CXCR5 in Raji wild-type cells in Western blot with loss of signal observed in CXCR5 knockout sample. Wild-type and CXCR5 knockout Raji cell lysates were subjected to SDS-PAGE. Membranes were blocked in fluorescent western blot (TBS-based) blocking solution before incubation with ab254415 and ab7291 (Mouse anti-Alpha Tubulin [DM1A]) overnight at 4 °C at a 1 in 1000 dilution and a 1 in 20000 dilution respectively. Blots were incubated with Goat anti-Rabbit IgG H&L (IRDye^® 800CW) preabsorbed (ab216773) and Goat anti-Mouse IgG H&L (IRDye^® 680RD) preabsorbed (ab216776) secondary antibodies at 1 in 20000 dilution for 1 h at room temperature before imaging.

Flow cytometry overlay histogram showing wild-type Raji (green line) and CXCR5 knockout Raji cells (ab273380) stained with ab254415 (red line). The cells were incubated in 1x PBS containing 10μg/ml human IgG and 10% normal goat serumto block FC receptors and non-specific protein-protein interaction followed by the antibody (ab254415) (1x10⁶ in 100μl at 0.2 μg/ml) for 30 min at 4°C.

The secondary antibody Goat anti-rabbit IgG H&L (Alexa Fluor^® 488, pre-adsorbed) (ab150081) was used at 1/2000 for 30 min at 4°C.

Isotype control antibody was Rabbit IgG (monoclonal) (ab172730) used at the same concentration and conditions as the primary antibody (wild-type Raji - black line; CXCR5 knockout Raji - grey line). Unlabelled sample was also used as a control (this line is not shown for the purpose of simplicity).

Acquisition of >5000 events were collected using a 50 mW Blue laser (488nm) and 525/40 bandpass filter.

Homozygous: 19 bp deletion in exon 2