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The 2015 UCLA iGEM Interlab/Measurements Study Notebook

Introduction

The 2015 UCLA iGEM Team is proud to participate in the Second International InterLab Measurement Study in synthetic biology. As members of the synthetic biology community, we are committed to providing robust data for development of novel characterization methods in the rapidly growing biological design fields of synthetic biology.

The purpose of the 2015 InterLab study is to "measure and characterize fluorescence data for three specific genetic devices" expressing [http://www.uniprot.org/uniprot/P42212 GFPmut3b] (SwissProt: P42212) from active iGEM teams participating around the world. By collecting fluorescence data from multiple teams in absolute units, variability in measurement and consistency of data collected from instrumentation following a uniform procedure can be determined within a high degree of accuracy.

This notebook will record all protocols, daily experiments, basic parameters and images, as well as the raw data used to prepare the Interlab Worksheet, Protocol, and Wiki page for submission at the 2015 Giant Jamboree.

Experimental Design

Three separate genetic "devices" were constructed using IDT gBlocks Gene Fragments synthesis, in addition to positive control [http://parts.igem.org/Part:BBa_I20270 BBa_I20270] (Constitutive Family Promoter [http://parts.igem.org/wiki/index.php?title=Part:BBa_J23151 J23151] inserted upstream of the promoter MeasKit) and negative control [http://parts.igem.org/Part:BBa_R0040 BBa_R0040] (pTetR - empty control plasmid). All gBlocks were designed on Benching to simulate the sequence of the BioBricks standard assembly product, for uniformity in measurement with teams that opted for RFC10 standard assembly. All devices were subcloned in the standard [http://parts.igem.org/Part:pSB1C3 pSB1C3] (chloramphenicol resistance marker) backbone and transformed into BL21(DE3) Escherichia coli . As such, E. coli BL21(DE3) laboratory strains were used as the chassis for fluorescent measurement. Details as to the location of the registry pieces used to construct the devices are below:

All devices constructed using the IDT gBlocks gene fragment synthesis scheme. Biobrick scar sites between the promoter and GFP generator sequence were preserved to simulate traditional Biobricks standard assembly.

Protocols

The following are a list of protocols designed for the InterLab Study.

• Preparation of chemically competent E. coli BL21(DE3) cells using Zymo Mix & Go Transformation Kit and Buffer Set
• Rapid isolation of plasmid DNA (pSB1C3) using the Promega PureYield MiniPrep System (Miniprep)
• Double digestion of plasmid DNA using EcoRI and PstI restriction exonucleases (XbaI/PstI Digest)
• Rapid ligation and subcloning of gBlocks double digests into pSB1C3 vector backbone using T7 ligase (T7 Ligation)
• QiaQuick gel extraction and purification of plasmid/digested DNA following gel electrophoresis (Gel Extraction)
• PCR Cleanup

Where to go from here

The following is the process for all 3 devices and the 2 controls (Promoter MeasKit and pTetR empty vector).

• 1. Order gBlocks gene fragments for all three devices HERE

• 2. Design and order primer pair for amplification of all three devices. HERE

• 3. Amplify all three devices, and PCR cleanup each reaction.

Following is for preparation of the 3 devices for cloning into pSB1C3:

• 4. Digest devices using EcoRI and PstI

• 5. Run digests on gels and gel purify/DNA clean and concentrate all digested pieces.

• 6. Ligate digested pieces in empty pSB1C3 vector backbone, and transform using chemical competency.

• 7. Pick transformants and prepare cultures for miniprep and glycerol stocking.

• 8. Digest miniprepped devices using EcoRI and PstI and run on a gel to verify size of the insert.

• 9. Sequence the 3 devices and compared alignments for predicted sequences to verify proper device implementation.

Following is the plan for fluorescence measurement and data analysis of the three devices, using + and - controls for baseline measurement. [TBD - Fluorescence measurement and FACS analysis.]

Raw lab notebook entries