Would you please explain to me what GST RhoA fusion protein means and how it differs from RhoA protein? I am a kind of doing an experiment using this protein.
GST is glutathione-S-transferase, an enzyme that binds reasonably tightly to glutathione. It is often used as a tag to purify proteins of interest. In your case, GST has been fused to RhoA most likely so that you have some means to purify it by applying it to a glutathione conjugated column. See here for more information.