# Team:SUSTC-Shenzhen-B/algorithm

### From 2012.igem.org

## Overview of Our Algorithm

**Introduction**

Our team created a PC software and an online tool to help users calculate the efficiency of their terminators.

To calculate the efficiency of terminator efficiency, there are three steps.

1.Cut the input terminator sequence into three parts, including A tail, stemloop and T tail.

2.Score the terminator.

3.Calculate the efficiency of terminator using the simulation formular created by our team.

**Previous Algorithm**

Three scoring systems mentioned above were all created by researchers to predict rho-independent transcription terminators. If the score of a sequence is good, it is more likely to be a terminator sequence. The score of terminator consists of two parts, corresponding to stemloop and T tail. Here we made a table to show the similarity and difference of these three scoring systems.

From the table we can see that Elena A Lesnik Scoring System is totally energy based. But to calculate free energy we need many thermal parameters. Carleton L Kingsford Scoring System is simple and convenient to use because it doesn’t need to use such many thermal parameters. So we use it to help us cut the terminator into three parts, a tail, stemloop and t tail and use the rest two scoring systems to help get the efficiency of terminator. In fact, Carleton L Kingsford Scoring System can also be used to help calculate the efficiency. But we thought energy based scoring systems would be better to describe the terminator because energy was a basic concept when describing things. So we choose the rest two scoring systems to get efficiency.

The simulation formular of score and efficiency were made based on our experiment data.