Initiation of RNA Polymerase III Productive Transcription

The transition from abortive to productive transcription may occur at bp +5. The primary transcripts of pol III-transcribed genes are short, ~90 to 120 nt for tRNA and 5s RNA genes (which constitute the great majority of products) and even the longest transcripts (e.g. the RNA of the signal recognition particles) are only ~500 nt. This event is inferred from an event in Saccharomyces cerevisiae.

转录过程中的由中断性至生成性的转变可能发生在基对 +5 位置。由多聚酶III转录的基因的主要转录产物较短，例如tRNA和5s RNA基因（占产物的大多数），其长度约为90至120个核苷酸，即便是最长的转录产物（如信号识别颗粒的RNA）也仅有约500个核苷酸。此现象的推断源于酿酒酵母（Saccharomyces cerevisiae）中的一个事件。