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© Institut Pasteur et Institut Imagine
Scanning electron micrograph of segmented filamentous bacterium (SFB). Segmented filamentous bacteria (SFB) are bacteria from the Clostridiaceae family that colonize the intestines of many species, likely including humans, without causing disease; they live in symbiosis with epithelial cells and are involved in the maturation of intestinal immunity.
Publication : Scientific reports

Active nuclear import of the deacetylase Sirtuin-2 is controlled by its C-terminus and importins

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Scientific reports - 10 Feb 2020

Eldridge MJG, Pereira JM, Impens F, Hamon MA

Link to Pubmed [PMID] – 32042025

Sci Rep 2020 Feb;10(1):2034

The NAD-dependent deacetylase Sirtuin-2 (SIRT2) functions in diverse cellular processes including the cell cycle, metabolism, and has important roles in tumorigenesis and bacterial infection. SIRT2 predominantly resides in the cytoplasm but can also function in the nucleus. Consequently, SIRT2 localisation and its interacting partners may greatly impact its function and need to be defined more clearly. In this study we used mass spectrometry to determine the interactomes of SIRT2 in whole cells and in specific cellular fractions; cytoplasm, nucleus and chromatin. Using this approach, we identified novel interacting partners of SIRT2. These included a number of proteins that function in nuclear import. We show that multiple importins interact with and contribute to the basal nuclear shuttling of SIRT2 and that one of these, IPO7 is required for SIRT2 mediated H3K18 deacetylation in response to bacterial infection. Furthermore, we reveal that the unstructured C-terminus of SIRT2 negatively regulates importin-binding and nuclear transport. This study demonstrates that SIRT2 is actively transported into the nucleus via a process regulated by its C-terminus and provides a resource of SIRT2 interacting partners.

https://www.ncbi.nlm.nih.gov/pubmed/32042025