p37 is a p97 adaptor required for Golgi and ER biogenesis in interphase and at the end of mitosis.
We previously reported that p97/p47-assisted membrane fusion is important for the reassembly of organelles at the end of mitosis, but not for their maintenance during interphase. We have now identified a p97 adaptor protein, p37, which forms a complex with p97 in the cytosol and localizes to the Golgi and ER. siRNA experiments revealed that p37 is required for Golgi and ER biogenesis. Injection of anti-p37 antibodies into cells at different cell cycle stages showed that p37 plays an important role in both Golgi and ER maintenance during interphase as well as in their reassembly at the end of mitosis. In an in vitro Golgi reassembly assay, the p97/p37 complex has membrane fusion activity. In contrast to the p97/p47 pathway, this pathway requires p115-GM130 tethering and SNARE GS15, but not syntaxin5. Interestingly, although VCIP135 is also required, its deubiquitinating activity is unnecessary for p97/p37-mediated activities.
Uchiyama
Keiji
K
Mitsubishi Kagaku Institute of Life Sciences, Tokyo 194-8511, Japan.
Totsukawa
Go
G
Puhka
Maija
M
Kaneko
Yayoi
Y
Jokitalo
Eija
E
Dreveny
Ingrid
I
Beuron
Fabienne
F
Zhang
Xiaodong
X
Freemont
Paul
P
Kondo
Hisao
H
D048868:Adaptor Proteins, Signal Transducing / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D000251:Adenosine Triphosphatases / Q000235:genetics / Q000378:metabolism*; D000595:Amino Acid Sequence; D000818:Animals; D002453:Cell Cycle; D003001:Cloning, Molecular; D004721:Endoplasmic Reticulum / Q000378:metabolism*; D015723:Gene Library; D006056:Golgi Apparatus / Q000378:metabolism*; D006367:HeLa Cells; D006801:Humans; D047468:Immunoprecipitation; D008561:Membrane Fusion; D008565:Membrane Proteins / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D051379:Mice; D008938:Mitosis / Q000502:physiology*; D008969:Molecular Sequence Data; D009687:Nuclear Proteins / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D050765:Qa-SNARE Proteins / Q000378:metabolism; D034741:RNA, Small Interfering / Q000494:pharmacology; D012441:Saccharomyces cerevisiae; D017386:Sequence Homology, Amino Acid; D020798:Two-Hybrid System Techniques; D025801:Ubiquitin / Q000378:metabolism; D033921:Vesicular Transport Proteins / Q000378:metabolism
D048868:Adaptor Proteins, Signal Transducing; D008565:Membrane Proteins; D009687:Nuclear Proteins; D050765:Qa-SNARE Proteins; D034741:RNA, Small Interfering; D025801:Ubiquitin; D033921:Vesicular Transport Proteins; C516317:p37 protein, mouse; D000251:Adenosine Triphosphatases; C404942:p97 ATPase