Abstract:
:To fulfill its role in protein biogenesis, the endoplasmic reticulum (ER) depends on the Hsp70-type molecular chaperone BiP, which requires a constant ATP supply. However, the carrier that catalyzes ATP uptake into the ER was unknown. Here, we report that our screen of gene expression datasets for member(s) of the family of solute carriers that are co-expressed with BiP and are ER membrane proteins identifies SLC35B1 as a potential candidate. Heterologous expression of SLC35B1 in E. coli reveals that SLC35B1 is highly specific for ATP and ADP and acts in antiport mode. Moreover, depletion of SLC35B1 from HeLa cells reduces ER ATP levels and, as a consequence, BiP activity. Thus, human SLC35B1 may provide ATP to the ER and was named AXER (ATP/ADP exchanger in the ER membrane). Furthermore, we propose an ER to cytosol low energy response regulatory axis (termed lowER) that appears as central for maintaining ER ATP supply.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Klein MC,Zimmermann K,Schorr S,Landini M,Klemens PAW,Altensell J,Jung M,Krause E,Nguyen D,Helms V,Rettig J,Fecher-Trost C,Cavalié A,Hoth M,Bogeski I,Neuhaus HE,Zimmermann R,Lang S,Haferkamp Idoi
10.1038/s41467-018-06003-9subject
Has Abstractpub_date
2018-08-28 00:00:00pages
3489issue
1issn
2041-1723pii
10.1038/s41467-018-06003-9journal_volume
9pub_type
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