| Identification of rabaptin 5 , rabex 5 , and GM 130 as putative effectors of rab33b , a regulator of retrograde traffic between the Golgi apparatus and ER . ^^^ A GST rab33b fusion protein stabilised in its GTP form was found to interact by Western blotting or mass spectroscopy with Golgi protein GM 130 and rabaptin 5 and rabex 5 , two rab effector molecules thought to function exclusively in the endocytic pathway . ^^^ |