[Immunology] Question: particulate or soluble antigenic structures

[Resul Karakus]

Dear Users,

I would like to know what the main point is, that
makes an antigen soluble or particulate (is there any
point beyond the hydrophobicity or ionic loads
existing on the molecule).
In particular, does anyone know if the HBV surface
antigen (HBsAg) "ad" and/or "ay" subtypes are
particulate or soluble? 
The second question is: if any water soluble molecule
is mixed and given with an adjuvant (eg, Freund's),
does this molecule still hold its soluble structure or
should it be regarded as particulate then?

Thanks all in advance,

Resul Karakus
PhD Student Immunology

--- Allison <allison at nospam.com> wrote:

> We do often do FACS analysis with monoclonal
> antibodies. As a control 
> for nonspecific binding of the MAb we use an isotype
> matched negative 
> control.
> 
> To avoid the problem of nonspecific binding of
> 2ndary Ab  we use 
> F(ab')2  anti-IgG conjugated to FITC (or other dye).
>   No Fc domain 
> means no binding to Fc receptors.
> 
> HTH
> Allison
> 
> 
> 
> Sanjay Patel wrote:
> > Dear Sir/Madam,
> > 
> >  
> > 
> > I'm staining mouse and human whole blood for FACS
> analysis. Some
> > investigators have told me that I need to use Fc
> block for both, and some
> > have said that I need Fc block only for mouse as
> human whole blood contains
> > serum which is a natural block? What should I be
> using and what is the best
> > block for each species?
> > 
> >  
> > 
> > Many thanks
> > 
> >  
> > 
> >  
> > 
> >  
> > 
> > Sanjay Patel
> > 
> _______________________________________________
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> http://www.bio.net/biomail/listinfo/immuno
> 


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