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                                   <li><a href="http://2012.igem.org/Team:SUSTC-Shenzhen-B/Contributions">Contributions</a></li>
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Revision as of 15:14, 25 October 2012

Title



Introduction

Transcription:

The transcription stage, the reading of genetic information from DNA, is composed of promoter binding and the activation of RNA polymerase, RNA transcript initiation and promoter escape, RNA transcript elongation, and transcript termination, and release.


What is terminator?

Terminators are genetic parts that usually occur at the end of a gene or operon and cause transcription to stop. In prokaryotes, terminators usually fall into two categories (1) rho-independent terminators and (2) rho-dependent terminators.

Rho-independent terminators are generally composed of palindromic sequence that forms a stem loop rich in G-C base pairs followed by several T bases. The conventional model of transcriptional termination is that the stem loop causes RNA polymerase to pause and transcription of the poly-A tail causes the RNA:DNA duplex to unwind and dissociate from RNA polymerase.


Terminator Efficiency:

Although terminators are positioned at the ends of genes, they also play irreplaceable roles. It is important that transcription is imperfectly terminated at some terminator so that the ratio of the amount of the mRNA transcribed from upstream and that from downstream of the terminator is controlled. This regulation is qualified by the termination efficiency.


Explanations

The process of transcription


the secondary structure of terminator

1

Design Ideas

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