InterPro domain: IPR044967

This entry represents a group of plant proteins, including PTAC10 from Arabidopsis. PTAC10 is a component of the PEP (plastid-encoded RNA polymerase) complex, which transcribes photosynthesis-related genes and plastid tRNAs during later developmental stages [ 1 , 2 ]. PTAC10 contains a single S1 RNA-binding domain. PTAC10 knock-out lines have been shown to display an albino phenotype and impaired chloroplast development. PTAC10 is essential for plastid gene expression in Arabidopsis and can be phosphorylated by cpCK2. Phosphorylation of pTAC10 could enhance its RNA-binding activity [ 3 ].

1. pTAC10, a Key Subunit of Plastid-Encoded RNA Polymerase, Promotes Chloroplast Development. Plant Physiol 174, 435-449
2. pTAC10, an S1-domain-containing component of the transcriptionally active chromosome complex, is essential for plastid gene expression in Arabidopsis thaliana and is phosphorylated by chloroplast-targeted casein kinase II. Photosynth Res 137, 69-83