Component of the PAN1 actin cytoskeleton-regulatory complex required for the internalization of endosomes during actin-coupled endocytosis. The complex links the site of endocytosis to the cell membrane-associated actin cytoskeleton. Required for assembly of the cortical actin cytoskeleton and for hyphal growth. Component of the PAN1 actin cytoskeleton-regulatory complex (By similarity). Interacts with PAN1 and CLN3. Localizes in patches that are found concentrated at the hyphal tip. Expression is regulated by NRG1 and MIG1. The N-terminal SH3 domains are important for actin cytoskeleton assembly but not for localization. Phosphorylated by the CDC28-CLN3 complex and by PRK1. CDC28-CLN3 phosphorylation regulates cortical actin patch dynamics, as well as PRK1 phosphorylation and SLA1 association with PAN1. Rapidly dephosphorylated upon hyphal induction. Belongs to the SLA1 family.