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Optineurin: The autophagy connection
#MMPMID26142952
Ying H
; Yue BY
Exp Eye Res
2016[Mar]; 144
(?): 73-80
PMID26142952
show ga
Optineurin is a cytosolic protein encoded by the OPTN gene. Mutations of OPTN are
associated with normal tension glaucoma and amyotrophic lateral sclerosis.
Autophagy is an intracellular degradation system that delivers cytoplasmic
components to the lysosomes. It plays a wide variety of physiological and
pathophysiological roles. The optineurin protein is a selective autophagy
receptor (or adaptor), containing an ubiquitin binding domain with the ability to
bind polyubiquitinated cargoes and bring them to autophagosomes via its
microtubule-associated protein 1 light chain 3-interacting domain. It is involved
in xenophagy, mitophagy, aggrephagy, and tumor suppression. Optineurin can also
mediate the removal of protein aggregates through an ubiquitin-independent
mechanism. This protein in addition can induce autophagy upon overexpression or
mutation. When overexpressed or mutated, the optineurin protein also serves as a
substrate for autophagic degradation. In the present review, the multiple
connections of optineurin to autophagy are highlighted.