TY  - JOUR
A1  - Wiederstein, Janica Lea
A1  - Nolte, Hendrik
A1  - Günther, Stefan
A1  - Piller, Tanja
A1  - Baraldo, Martina
A1  - Kostin, Sawa
A1  - Bloch, Wilhelm
A1  - Schindler, Natalie
A1  - Sandri, Marco
A1  - Blaauw, Bert
A1  - Braun, Thomas
A1  - Hölper, Soraya
A1  - Krüger, Marcus
T1  - Skeletal muscle-specific methyltransferase METTL21C trimethylates p97 and regulates autophagy-associated protein breakdown
T2  - Cell reports
N2  - Protein aggregates and cytoplasmic vacuolization are major hallmarks of multisystem proteinopathies (MSPs) that lead to muscle weakness. Here, we identify METTL21C as a skeletal muscle-specific lysine methyltransferase. Insertion of a β-galactosidase cassette into the Mettl21c mouse locus revealed that METTL21C is specifically expressed in MYH7-positive skeletal muscle fibers. Ablation of the Mettl21c gene reduced endurance capacity and led to age-dependent accumulation of autophagic vacuoles in skeletal muscle. Denervation-induced muscle atrophy highlighted further impairments of autophagy-related proteins, including LC3, p62, and cathepsins, in Mettl21c−/− muscles. In addition, we demonstrate that METTL21C interacts with the ATPase p97 (VCP), which is mutated in various human MSP conditions. We reveal that METTL21C trimethylates p97 on the Lys315 residue and found that loss of this modification reduced p97 hexamer formation and ATPase activity in vivo. We conclude that the methyltransferase METTL21C is an important modulator of protein degradation in skeletal muscle under both normal and enhanced protein breakdown conditions.
KW  - atrophy
KW  - autophagy
KW  - methyltransferases
KW  - p97
KW  - skeletal muscle
Y1  - 2018
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/51114
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-511143
SN  - 2211-1247
N1  - This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
VL  - 23
IS  - 5
SP  - 1342
EP  - 1356
PB  - Cell Press ; Elsevier
CY  - Maryland Heights, MO ; [New York, NY]
ER  -