STX17 (syntaxin 17) is a SNARE protein essential for autophagosome-lysosome fusion in autophagy. As a soluble N-ethylmaleimide-sensitive factor-attachment protein receptor, STX17 localizes on the autophagosome membrane and assembles with partner SNAREs to form trans-SNARE complexes that drive membrane fusion 123. STX17 directly controls autophagosome maturation by mediating fusion with lysosomal membranes, a critical step for degrading cellular cargo 12. Recent mechanistic studies reveal that STX17 forms a priming complex with SNAP29 and YKT6 on autophagosomes, which is subsequently displaced by VAMP8 to create the fusogenic STX17-SNAP29-VAMP8 complex 4. STX17 recruitment to ER-mitochondria contact sites, mediated by binding to ATG14, is crucial for autophagosome biogenesis 5. Beyond autophagy, STX17 maintains ER-Golgi intermediate compartment (ERGIC) architecture and regulates early secretory pathway transport 6. Dysregulation of STX17 has disease implications: zinc influx through MCOLN1 disrupts STX17-VAMP8 interaction, arresting autophagic flux in cancer cells 7, while altered STX17 expression affects macrophage autophagy maturation in allergic asthma 8. Post-translational acetylation of STX17 regulates autophagosome-lysosome fusion efficiency 9.