PNP — Asparagus officinalis

Summary

A4U43_C07F33010, symbol AoPNP, encodes a polynucleotide phosphorylase (PNPase) with polyribonucleotide nucleotidyltransferase activity, 3'-5' exoribonuclease activity, and RNA binding, and contains KH and S1 domains. In asparagus (Asparagus officinalis) on chromosome 7, this gene is associated with mitochondrial mRNA catabolic and RNA processing, chloroplast RNA processing, tRNA and rRNA processing, and cellular response to phosphate starvation. It is linked to carotene, xanthophyll, and chlorophyll anabolism, as well as downregulation of the mevalonate-independent isopentenyl diphosphate biosynthetic pathway. The product localises to chloroplast stroma, mitochondria, cytosol, and nucleus. Phenotype associations include pathogen resistance, carotenoid and chlorophyll accumulation, and fosmidomycin resistance. Studies of related genes in other species link the family to carotenoid content, root fresh weight, disease tolerance, and photochemical quenching.