Promotes the copper deficiency response by direct interaction with SPL7. Acts with SPL7 in a common pathway to promote copper-responsive genes and alleviate oxidative stress during copper-limiting periods. May promote SPL7 function when copper is limiting (PubMed:24335506). Participates in the control of general plant growth and development, and in the response to counteract the negative effects of UV radiation (PubMed:24713636). Interacts with SPL7. Nuclear localization with a speckled distribution pattern. Expressed in root vasculature, lateral roots, cotyledons, rosette leaves, cauline leaves, stems, sepals, style of pistils, mature pollen grains and siliques. Plants silencing KIN17 show aberrant growth and reduced fertility. Belongs to the KIN17 family.