Telomerase ribonucleoprotein complex -RNA-binding (IPR021891). Telomerase plays a significant role in determining the length of telomeres. It is a reverse transcriptase that adds these basic sequence repeats to the ends of chromosomes by utilizing the template sequence in the RNA component of the replicase. The RNA binding domain TRBD of telomerase is composed of 12 α helices and 2 short β sheets. TRBD is involved in the formation of the holoenzyme, which performs telomere extension, as well as RNA recognition and binding.