Enables collagen binding activity and signaling receptor binding activity. Involved in several processes, including positive regulation of MAPK cascade; positive regulation of neuron apoptotic process; and vasodilation. Located in several cellular components, including acrosomal vesicle; external side of plasma membrane; and perikaryon. Orthologous to human ITGA1 (integrin subunit alpha 1). [provided by Alliance of Genome Resources, Apr 2022]