Catalytic subunit of the DNA primase complex and component of the DNA polymerase alpha complex (also known as the alpha DNA polymerase-primase complex) which play an essential role in the initiation of DNA synthesis (PubMed:6773966, PubMed:6806812, PubMed:6812052, PubMed:6403945, PubMed:6409898). During the S phase of the cell cycle, the DNA polymerase alpha complex (composed of a catalytic subunit PolA1, an accessory subunit PolA2 and two primase subunits, the catalytic subunit Prim1 and the regulatory subunit Prim2) is recruited to DNA at the replicative forks (By similarity). The primase subunit of the polymerase alpha complex initiates DNA synthesis by oligomerising short RNA primers on both leading and lagging strands (By similarity). These primers are initially extended by the polymerase alpha catalytic subunit and subsequently transferred to polymerase delta and polymerase epsilon for processive synthesis on the lagging and leading strand, respectively (By similarity). In the primase complex, both subunits are necessary for the initial di-nucleotide formation, but the extension of the primer depends only on the catalytic subunit (By similarity). Can add both ribo- and deoxynucleotides during elongation of the primers (PubMed:6812052). Binds single stranded DNA (By similarity). The presence of the regulatory subunit Prim2 accelerates the kinetics of initiation and primer extension. Heterodimer of a catalytic subunit Prim1 and a regulatory subunit Prim2, also known as the DNA primase complex (PubMed:6403945, PubMed:6409898). Component of the alpha DNA polymerase complex (also known as the alpha DNA polymerase-primase complex) consisting of four subunits: the catalytic subunit PolA1, the regulatory subunit PolA2, and the primase complex subunits Prim1 and Prim2 respectively (PubMed:6773966, PubMed:6403945, PubMed:6409898). PolA1 associates with the DNA primase complex before association with PolA2 (PubMed:6409898). Expressed in embryos (at protein level). Expressed both maternally and zygotically. Expression is very low in late embryos, larvae, pupae and adult males. The bound zinc ion is not a cofactor. It is bound to a zinc knuckle motif that may be involved in sequence recognition and the binding of ssDNA (By similarity). Belongs to the eukaryotic-type primase small subunit family.