Inositol hexakisphosphate (IP6) and inositol heptakisphosphate (IP7) kinase; generation of high energy inositol pyrophosphates by Kcs1p is required for many processes such as vacuolar biogenesis, stress response, RNA polymerase I-mediated rRNA transcription and telomere maintenance; phosphorylated by the AMPK Snf1p, leading to reduced levels of pyrophosphorylated IP7, increased filamentous and invasive growth and increased cell elongation