How to catch calcium binding proteins?

[Jochen Strayle Biochemistry Stuttgart-Germany]

Hi out there

I need some help from experienced biochemists. I have a protein with maybe 
week calcium binding sites ( no EF-hands). And I want to show that this protein 
binds calcium, at least. Has anybody experiences with gelshift experiments, 
dyes or something else to detect low affinity calcium binding sites. I don«t know 
if it«s been tried.
If it does, let me know.
Thanks,
Jochen

e-mail:  jochen.strayle at po.uni-stuttgart.de