The role of SRP9/SRP14 in regulating Alu RNA.

SRP9/SRP14 is a protein heterodimer that plays a critical role in the signal recognition particle through its interaction with the scaffolding signal recognition particle RNA (7SL). SRP9/SRP14 binding to 7SL is mediated through a conserved structural motif that is shared with the primate-specific Alu RNA. Alu RNA are transcription products of Alu elements, a retroelement that comprises ~10% of the human genome. Alu RNA are involved in myriad biological processes and are dysregulated in several human disease states. This review focuses on the roles SRP9/SRP14 has in regulating Alu RNA diversification, maturation, and function. The diverse mechanisms through which SRP9/SRP14 regulates Alu RNA exemplify the breadth of protein-mediated regulation of non-coding RNA.