Team:ETH Zurich/Experiments 3

From 2013.igem.org

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Revision as of 17:57, 25 September 2013

Header2.png
80px-Eth igem logo.png

Contents

Enzyme-substrate reactions

The enzyme substrate reactions take less than 5 minutes and are visible by eye.

Our minesweeper is becoming better and better so keep on track for updates !

2013-09-16 09.30 (1).png

In Figure 1 you can see the different hydrolases we use.


Hydrolase Complementary substrate / IUPAC name Visible color Concentration[M] Time(s)for colorimetric response
LacZ Beta-Galactosidase X-Gal 5-Bromo-4chloro-3-indolyl-beta-galactopyranoside Blue
Blau.png
LacZ Beta-Galactosidase Green-beta-D-Gal N-Methyl-3-indolyl-beta-D_galactopyranoside Green
Grün.png
GusA Beta-glucuronidase Magenta glucuronide 6-chloro-3-indolyl-beta-D-glucuronide-cycloheylammonium salt Red
Rot.png
PhoA Alkaline phosphatase pNPP 4-Nitrophenylphosphatedi(tris) salt Yellow
Gelb.png
Aes Acetyl esterase Magenta butyrate 5-bromo-6-chloro-3-indoxyl butyrate Magenta
Lila.png
NagZ Glycoside hydrolase X-glucosaminide X-Glucnac 5-bromo-4-chloro-3-indolyl-N-acetyl-beta-D-glucosaminide Blue




Beta-galactosidase(LacZ)

Chemical conversion

LacZhydro.png

Colorimetric response in liquid culture

Colorimetric response on LB-Agar

Fig.5: X-Gal on LacZ expressing colony
Fig.6: Beta-green-X-gal on LacZ expressing colony


Alkaline phosphatase(PhoA)

Chemical conversion

PhoAhydro.png

Colorimetric response in liquid culture

Colorimetric response on LB-Agar

Acetyl esterase(Aes)

Chemical conversion

Aeshydro.png

Colorimetric response in liquid culture

Colorimetric response on LB-Agar

Beta-glucuronidase(GusA)

Chemical conversion

GusAhydro.png

Colorimetric response in liquid culture

Colorimetric response on LB-Agar

β-N-Acetylglucosaminidase(NagZ)

Chemical conversion

NagZhydro.png

Colorimetric response in liquid culture

Colorimetric response on LB-Agar

Do the substrates and enzymes cross-react ?

Figure 6.2: Expected colorimetric response

An enzyme-substrate test matrix (Figure 6) was established to test each substrate against each enzyme. The results were as expected (Figure 6.2) and no cross reaction is visible. The NagZ-X - glucosaminide X-Glunac reveal some difficulties in the liquid culture as well as on the agar plate.