The Chloroplast Ribonucleoprotein CP33B Quantitatively Binds the psbA mRNA

Marlene Teubner, Benjamin Lenzen, Lucas Bernal Espenberger, Janina Fuss, Jörg Nickelsen, Kirsten Krause, Hannes Ruwe, Christian Schmitz-Linneweber
2020 Plants  
Chloroplast RNAs are stabilized and processed by a multitude of nuclear-encoded RNA-binding proteins, often in response to external stimuli like light and temperature. A particularly interesting RNA-based regulation occurs with the psbA mRNA, which shows light-dependent translation. Recently, the chloroplast ribonucleoprotein CP33B was identified as a ligand of the psbA mRNA. We here characterized the interaction of CP33B with chloroplast RNAs in greater detail using a combination of RIP-chip,
more » ... uantitative dot-blot, and RNA-Bind-n-Seq experiments. We demonstrate that CP33B prefers psbA over all other chloroplast RNAs and associates with the vast majority of the psbA transcript pool. The RNA sequence target motif, determined in vitro, does not fully explain CP33B's preference for psbA, suggesting that there are other determinants of specificity in vivo.
doi:10.3390/plants9030367 pmid:32192026 pmcid:PMC7154868 fatcat:dez6ijs6bfhfzgxdktgyud6tkm