ATP4 — Brassica juncea

Summary

BJUA06G02990S (ATP4) in Indian mustard (Brassica juncea) on chromosome A06 encodes a protein containing Smr, PPR, and TPR-like helical domains. The product binds pre-rRNA, single-stranded RNA, mRNA, and identical proteins, and is associated with chloroplast RNA processing, group II intron splicing, positive regulation of translation, mRNA stabilization, and mRNA processing. It localizes to the chloroplast stroma, mitochondria, and cytoplasm. This gene has been connected to cytoplasmic male sterility. Studies of related genes in other species, including PPR5, PPR10, CRP1, and Rf1, link the family to chloroplast RNA processing and fertility restoration, though these functions are not yet established for the Indian mustard gene itself.