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XB-ART-13818
J Cell Biol December 14, 1998; 143 (6): 1559-73.
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Role of xklp3, a subunit of the Xenopus kinesin II heterotrimeric complex, in membrane transport between the endoplasmic reticulum and the Golgi apparatus.

Le Bot N , Antony C , White J , Karsenti E , Vernos I .


Abstract
The function of the Golgi apparatus is to modify proteins and lipids synthesized in the ER and sort them to their final destination. The steady-state size and function of the Golgi apparatus is maintained through the recycling of some components back to the ER. Several lines of evidence indicate that the spatial segregation between the ER and the Golgi apparatus as well as trafficking between these two compartments require both microtubules and motors. We have cloned and characterized a new Xenopus kinesin like protein, Xklp3, a subunit of the heterotrimeric Kinesin II. By immunofluorescence it is found in the Golgi region. A more detailed analysis by EM shows that it is associated with a subset of membranes that contain the KDEL receptor and are localized between the ER and Golgi apparatus. An association of Xklp3 with the recycling compartment is further supported by a biochemical analysis and the behavior of Xklp3 in BFA-treated cells. The function of Xklp3 was analyzed by transfecting cells with a dominant-negative form lacking the motor domain. In these cells, the normal delivery of newly synthesized proteins to the Golgi apparatus is blocked. Taken together, these results indicate that Xklp3 is involved in the transport of tubular-vesicular elements between the ER and the Golgi apparatus.

PubMed ID: 9852151
PMC ID: PMC2132969
Article link:


Species referenced: Xenopus
Genes referenced: gal.2 kdelr1 kdelr3 kif3b klc1
Antibodies: Kif3b Ab1 Kif3b Ab3


Article Images: [+] show captions
References [+] :
Arnheiter, Direct visualization of protein transport and processing in the living cell by microinjection of specific antibodies. 1984, Pubmed