YKT6 vesicular SNARE protein (YKT6)

YKT6 vesicular SNARE protein is a conserved R-SNARE critical for membrane fusion along multiple intracellular vesicular trafficking pathways. Ykt6 is unique among SNAREs, as it reversibly cycles between cytosolic and membrane-associated states through post-translational lipidation (palmitoylation, farnesylation, and geranylgeranylation) rather than a canonical transmembrane domain[1][6]. This dynamic localization is regulated by its N-terminal longin domain, which mediates autoinhibition through intramolecular interaction with the SNARE domain. Activation of Ykt6 involves conformational switches, often regulated by phosphorylation, that expose its lipid anchor for membrane association and permit SNARE complex assembly[1][4][6]. Ykt6 mediates key fusion events in the secretory pathway, Golgi retrograde transport, and particularly in autophagosome-lysosome fusion in both yeast and animals[2][3][6]. It is highly expressed in neurons, where it contributes to specialized vesicle trafficking and may be involved in unique lysosome-like compartments[5]. Ykt6 dysfunction (including its interaction with pathogenic α-synuclein species) disrupts normal trafficking, impairs autophagy, and is implicated in the pathogenesis of synucleinopathies such as Parkinson’s disease[1]. No current drugs directly target Ykt6, but its molecular function positions it as a candidate for therapeutic modulation in autophagy and neurodegeneration research[1][6].

Other names

Ykt6p (in yeast)Vesicular SNARE protein Ykt6

Modulation of YKT6 (e.g., via phosphorylation) affects its conformation, leading to altered vesicle trafficking and fusion processes. Dysregulation via interactions with α-synuclein aggravates toxicity in disease models.