I need help understanding ERG toxins and their effects on B Cells

From the get-go, I really can't see a correlation to B-cell leukocytes. How did you come up with the presumption?

Here's how I arrived at my possibly wacky presumption...   

The thought process began when I read a recent study out of Norway on the anti-CD20 antibody Rituximab, which  is effective at B-Cell depletion (and consequently, effective in the treatment of ME/CFS, which the authors suggest may be an autoimmune disorder).   

So, I looked around for other immunosupressants and found that there seems to be agreement that inhibition of the K+ channel function can lead (among other things) to a decrease in proliferation of lymphocytes.

Following this, I discovered that various K+ toxins are found in scorpion venoms.   The article below discusses some of these.  However it does not address the potassium channel toxin gamma-KTx 3.4, (also referred to as ERG2) which is found in Centruroides gracilis.

Here's the article:

Journal of Immunology

So.... am I totally off base here? 

Thanks for your time... and any suggestions on where to look for "natural" b-cell inhibitors.