Team:Chiba/jk/γ/Trl

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Latest revision as of 04:41, 30 October 2008

実験ログ
 出力班

Time Responce Liquid

purpose

To find the earliest output gene after induction

Reporter

Fluorescent Protein

GFP

pGFPuv

BBa_T9002

Venus YFP

BBa_K084003

pLac-Venus YFP

mCherry

pLac-mCherry

β-gal (X-gal assay)

pUC19(plac-LacZα)

Equipment

shaking incubator

Innova 4200 Benchtop or Floor-Stackable Incubator Shaker(37°C)

46-well plate(deep well)

96-well plate(deep well)

Fluoroskan Ascent 2.5(program:Ascent Software Version 2.6)

Beckman Allegratm X-12R Centrifuga(Beckman Coulter)

Method

Fig. レポーターのタイムレスポンスの実験方法

Strain:XL10G Kan^R

Liquid medium experiment

Pre-culture
1. Picked and cultured the following plate in 2mL of LB:
  1. LB-Amp+0.2 % Glucose, (pGFPuv, pLac-Venus YFP, pLac-mCherry, pUC19)
  2. LB-Amp, ([http://partsregistry.org/Part:BBa_T9002 BBa_T9002], [http://partsregistry.org/Part:BBa_K084003 BBa_K084003])
2. Cultured at 37°C for 12h.
Culture
1. Dilute pre-cultures and add to new LB medium.
  1. LB-Amp+0.2 % Glucose, (pGFPuv, pLac-Venus YFP, pLac-mCherry, pUC19)
  2. LB-Amp, ([http://partsregistry.org/Part:BBa_T9002 BBa_T9002], [http://partsregistry.org/Part:BBa_K084003 BBa_K084003])
2. Cultured at 37°C for about 6 h
Wash
1. Transfer 10mL each of the culture to 50mL centrifuge tubes.
2. Centrifuged for 6min at 3600rpm,20°C and discarded the supernatant.
3. Add physiological saline and resuspention
4. Repeated wash twice.
5. Add M9 minimal medium.
Mix
1. Dispens each culture into 48-well deep well or 96-well deep well
2. Add IPTG fainal conc. 0.2 mM (pGFPuv, pLac-Venus YFP, pLac-mCherry, pUC19)
3. Add AHL fainal conc. 100nM ([http://partsregistry.org/Part:BBa_T9002 BBa_T9002], [http://partsregistry.org/Part:BBa_K084003 BBa_K084003])
Measure fluorescence intensity every 1 h.

Result

Discussion Discussion

The purpose of this project is to alter the time required for expression.

By increasing the concentration of X-gal, the time required for

expression to be observable decreased, but this still takes longer than the time required when using fluorescent proteins.

Using β-gal, which uses X-gal as substrate, the time required for

output may increase because the substrate concentration decreases with time.

For the above reasons, fluorescence proteins are more suited for our purposes.

Of the fluorescent proteins, GFP and YFP fluorescence was observable at earlier stages.

But to the naked eye, GFP could be observed more easily.

Therefore, we chose GFP as our output reporter.

ホーム	メンバー紹介	プロジェクト紹介	Parts Submitted to the Registry	モデリング	ノート

@@ Line 5: / Line 5: @@
 ==Time Responce Liquid==
 ===purpose===
-インダクションをかけてからいち早く、確認できる出力を見つけること
 <br>To find the earliest output gene after induction
@@ Line 62: / Line 61: @@
 *[[TEam:Chiba/jk/γ/Trl/0914|14,September,2008]]
-===Discussion===
+'''Discussion'''
-このプロジェクトでは、発現するまでの時間を変えることが目的である
+Discussion
-*X-galの濃度を高くすると発現を確認できるまでの時間は短くなったが、蛍光たんぱくで発現を確認できるまでの時間より遅い
-*X-galを基質とするβ-galでは、時間がたつごとに基質濃度が下がり、出力までの時間が長くなってしまうことも考えられる
-以上の2つの理由から蛍光タンパク質が適している
-またGFP,YFPの発現時間までのタイムラグが一番少なかった
+The purpose of this project is to alter the time required for expression.
+* By increasing the concentration of X-gal, the time required for
+expression to be observable decreased, but this still takes longer
+than the time required when using fluorescent proteins.
+*Using β-gal, which uses X-gal as substrate, the time required for
+output may increase because the substrate concentration decreases with
+time.
+For the above reasons, fluorescence proteins are more suited for our purposes.
+Of the fluorescent proteins, GFP and YFP fluorescence was observable
+at earlier stages.
+* But to the naked eye, GFP could be observed more easily.
+Therefore, we chose GFP as our output reporter.
-*目視で確認した際、GFPのほうがYFPよりも目視で確認するのが容易であった
-以上の理由から、出力はGFPとする。