protein mass weight different?

[VoiD]

On 20 Jun 2001, Jun Zhang wrote:

>           By immunoscreening methods,our lab has gotten a new gene. However
> surprisingly, the protein mass weight that I expressed the gene in E.coli is
> much smaller than that obtained by immunoprecipitation.
>     The first possibility we come into mind is that glycosylation.
>       But we can not find any glycosylation site in our predicted protein
> sequence.
>         
Is the protein highly negatively charged? FtsY runs anomalously on
SDS-PAGE partially because it has an unusual charge distribution. Your
protein may be behaving in a similar manner.

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