Adapter protein required for olfactory adaptation and recovery to volatile odorants, probably by desensitization of G-protein coupled receptors (GPCR) (PubMed:15878875). May play a role in clathrin-mediated GPCR endocytosis (PubMed:15878875). Acts as positive regulator of insulin-like daf-2 signaling pathway probably by forming a complex with mpz-1 and phosphatase daf-18 likely resulting in daf-18 inhibition (PubMed:20207731). Involved in egg-laying (PubMed:15878875). Component of a complex composed of arr-1, daf-18 and mpz-1 (PubMed:20207731). Within the complex, interacts (via C-terminus) with mpz-1 (via PDZ domain) and phosphatase daf-18 (PubMed:20207731). May interact (via C-terminus) with clathrin chc-1 and beta-2 adaptin (AP2) apb-1 (PubMed:15878875). Localizes to the amphid processes of chemosensory neurons. Expressed in head neurons, nerve ring and ventral nerve cord (at protein level) (PubMed:15878875). Expressed in the nervous system including the nerve ring and the ventral and dorsal nerve cords (PubMed:15878875, PubMed:15157420). Highly expressed in amphid chemosensory neurons AWA, AWB, AWC, ADL and ASH, and in hermaphrodite specific neuron HSN (PubMed:15878875, PubMed:15157420). Also expressed in the intestine (PubMed:15157420). The [DE]-X(1,2)-F-X-X-[FL]-X-X-X-R motif mediates the interaction with the AP-2 complex subunit apb-1. The C-terminus (aa 369-435) is required for the recovery of chemotaxis from odorant-induced adaptation but is dispensable for behavioral adaptation to chemoattractant isoamyl alcohol. No effect on the response to the aversive chemical stimulus octanol or to volatile attractants (PubMed:15157420). Behavioral adaptation to prolonged exposure to isoamyl alcohol or benzaldehyde is impaired (PubMed:15878875). Recovery of chemotaxis from odorant-induced adaptation is impaired (PubMed:15878875). Moderate reduction in chemotaxis towards volatile attractant diacetyl but not towards isoamyl alcohol and benzaldehyde (PubMed:15878875). Slight defect in egg-laying (PubMed:15878875). Increased lifespan and nuclear localization of daf-16 (PubMed:20207731). Reduced lifespan in a daf-16 (mu86) mutant background or in a mpz-1 RNAi-mediated knockdown background (PubMed:20207731). Belongs to the arrestin family.