Integrin alpha-PS1/beta-PS is a receptor for laminin. Heterodimer of an alpha and a beta subunit. The alpha subunit is composed of a heavy and a light chain linked by a disulfide bond. Alpha-PS1 associates with beta-PS. During mid-oogenesis, localizes to the apical, to the lateral and to the basal membranes of follicle cells. Apical membrane localization peaks at oogenesis stages 9 and 10A in columnar follicle cells overlying the oocyte while decreases in the most posterior follicle cells. Localization to lateral and basal membranes persists during dorsal appendage morphogenesis, although diminished and often absent. Expressed in follicle cells (at protein level). At syncytial blastoderm stage, expressed in the ectoderm but not in the mesodermal precursors. At embryonic stage 7, expressed in dorsal and ventrolateral ectoderm and in some yolk nuclei. At late stage 10, expression is homogeneous in the ectoderm and is particularly abundant in the anterior and posterior midgut primordia. At stage 11, strongly expressed in a metameric pattern in the ectoderm, in the proctodeum and in the posterior midgut primordium. At stage 12, accumulates at the segment boundaries that start to become morphologically visible, similar expression pattern is observed in the central nervous system. In third larval instar wing imaginal disk, strongly expressed in the dorsal compartment, in the adepithelial cells and in patches on the peripodial membrane covering the imaginal disk to the outside. Expressed during mid- and late-oogenesis (at protein level). Expressed throughout embryonic and larval development with peaks of expression during mid-embryogenesis and at third larval instar. Belongs to the integrin alpha chain family.