SP1 — Brassica oleracea var. botrytis

Summary

BoSP1, located on chromosome 9 of cauliflower (Brassica oleracea var. botrytis), encodes a RING-type E3 ubiquitin-protein transferase belonging to the SP1/SPL1 and MUL1-like families. It is associated with protein ubiquitination, protein destabilization, and the regulation of chloroplast stroma protein import, as well as peroxisome matrix protein import and downregulation of fatty acid beta-oxidation. The gene product localizes to the peroxisome membrane, chloroplast outer membrane and envelope, and mitochondria. BoSP1 is associated with chloroplast development, peroxisome biogenesis, stress tolerance, abiotic stress response, disease resistance, and programmed cell death. Studies of related genes in other species link the family to osmotic, salt, and oxidative stress tolerance, as well as chloroplast development and plant stress response traits.