Recombinant Human AP3S1 protein

Supplementary information

This supplementary information is collated from multiple sources and compiled automatically.

AP3S1 also known as adaptor-related protein complex 3 sigma-1 is a subunit of the AP-3 adaptor complex. This protein plays a role in the sorting and trafficking of membrane proteins to lysosomes and other intracellular compartments. AP3S1 is expressed in a variety of tissues with notable expression in brain and immune cells. It has a mass of approximately 19 kDa. The protein serves as a critical component for the proper targeting and vesicle budding processes within cells.

Biological function summary

AP3S1 interacts as a part of the multisubunit AP-3 complex. This complex consists of four subunits and participates in the transport of proteins from the trans-Golgi network to lysosomes. The presence of AP3S1 ensures the selective packaging of proteins into vesicles destined for lysosomal compartments. This function contributes to cellular homeostasis and effective degradation of lysosomal substrates. The AP-3 complex including AP3S1 is therefore integral to intracellular protein sorting.

Pathways

AP3S1's role in vesicular transport places it within the lysosome biogenesis and protein trafficking pathways. It interacts with proteins like clathrin which aids in coat formation around vesicles and facilitates the transport function of the AP-3 complex. This protein along with others in the AP-3 complex ensures the proper delivery of enzymes and other proteins necessary for lysosomal function. Its involvement in these pathways highlights its importance in maintaining cellular balance and nutrient processing.

Defects in AP3S1 are linked to Hermansky-Pudlak syndrome a rare genetic disorder characterized by albinism prolonged bleeding and lung fibrosis. The dysfunction of AP3S1 affects the function of other AP-3 subunits causing improper lysosomal trafficking. Another related protein dysbindin has been associated with schizophrenia suggesting the AP-3 complex might affect neurological pathways through protein sorting errors. Understanding AP3S1's role might offer insights into these conditions and potential therapeutic targets.