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2015 ; 11
(10
): e1005174
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gab.com Text
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English Wikipedia
The Autophagy Receptor TAX1BP1 and the Molecular Motor Myosin VI Are Required for
Clearance of Salmonella Typhimurium by Autophagy
#MMPMID26451915
Tumbarello DA
; Manna PT
; Allen M
; Bycroft M
; Arden SD
; Kendrick-Jones J
; Buss F
PLoS Pathog
2015[Oct]; 11
(10
): e1005174
PMID26451915
show ga
Autophagy plays a key role during Salmonella infection, by eliminating these
pathogens following escape into the cytosol. In this process, selective autophagy
receptors, including the myosin VI adaptor proteins optineurin and NDP52, have
been shown to recognize cytosolic pathogens. Here, we demonstrate that myosin VI
and TAX1BP1 are recruited to ubiquitylated Salmonella and play a key role in
xenophagy. The absence of TAX1BP1 causes an accumulation of ubiquitin-positive
Salmonella, whereas loss of myosin VI leads to an increase in ubiquitylated and
LC3-positive bacteria. Our structural studies demonstrate that the
ubiquitin-binding site of TAX1BP1 overlaps with the myosin VI binding site and
point mutations in the TAX1BP1 zinc finger domains that affect ubiquitin binding
also ablate binding to myosin VI. This mutually exclusive binding and the
association of TAX1BP1 with LC3 on the outer limiting membrane of autophagosomes
may suggest a molecular mechanism for recruitment of this motor to
autophagosomes. The predominant role of TAX1BP1, a paralogue of NDP52, in
xenophagy is supported by our evolutionary analysis, which demonstrates that
functionally intact NDP52 is missing in Xenopus and mice, whereas TAX1BP1 is
expressed in all vertebrates analysed. In summary, this work highlights the
importance of TAX1BP1 as a novel autophagy receptor in myosin VI-mediated
xenophagy. Our study identifies essential new machinery for the
autophagy-dependent clearance of Salmonella typhimurium and suggests modulation
of myosin VI motor activity as a potential therapeutic target in cellular
immunity.