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From 2011.igem.org

Contents 1 Transformation via electroporation 2 Standard BioBrick Assembly 2.1 Suffix Insertion 2.2 Prefix Insertion 2.3 Variations 3 Standard Freiburg BioBrick Assembly 3.1 Suffix Insertion 3.2 Prefix Insertion 3.3 Variations 4 Standard 3A assembly 4.1 Digestion 4.2 Ligation 5 Freiburg 3A assembly 5.1 Digestion 5.2 Ligation 6 Restriction analysis 7 Bisphenol A analysis 7.1 Extraction with ethylacetate 7.2 HPLC method 8 Used enzymes 9 Used Kits 10 Media, buffer, solutions etc. 10.1 TAE buffer 10.2 DNA loading buffer 10.3 LB medium

Transformation via electroporation

• Thaw 50 µL competent E.coli cells on ice, dilute with icecold 50 µL glycerol (10 %) if necessary
• Add 0.5-5 µL plasmid to 50 µl electrocompetent cells
• Store cells on ice for 1 minute
• Electroporate at U = 2.5 kV, C = 25 µF, R = 200 Ώ
• Transfer transformation reaction to 450 µL SOC-Medium and shake 1 h at 37°C
• Centrifuge 2 min at 800 rpm and plate on selective LB-Medium

Standard BioBrick Assembly

modified from [http://openwetware.org/wiki/Silver:_BB_Strategy Silver lab]:

This assembly method can be used for BioBricks which are bigger than 150 bp. The BioBrick should be at least 500 bp bigger or smaller than the backbone. The BioBrick, which complies with these conditions, is used as the insert and is assembled into the prefix or suffix of the other used BioBrick, called vector. So you have to differentiate between a prefix and a suffix insertion.

Suffix Insertion

• Digestion of insert: at least 700 ng DNA / 10 µL volume, 1 µL 10x Tango buffer, 0.5 µL XbaI, 1 µL PstI. Digest for 2 h at 37 °C, afterwards inactivation for 20 min at 80 °C. Clean up the insert via gel electrophoresis. When cutting the insert out of the gel try to avoid staining or exposure to ultraviolet light of the insert.

• Digestion of vector about 700 ng DNA / 10 µL volume, 1 µL 10x orange buffer, 0.5 µL SpeI, 0.5 µL PstI. Digest for 2 h at 37 °C, afterwards inactivation for 20 min at 80 °C. Add 1 µL SAP (shrimp alcaline phosphatase) and 1.2 µL 10 x SAP buffer, incubate for 1 h at 37 °C. Clean up the vector with a PCR clean-up kit.

• Ligation: after digestion and clean-up: 50 - 200 ng of vector, 3 - 10 fold molar access of insert, 20 µL ligation volume, 2 µL T4-Ligase-Buffer, 1 µL T4-Ligase. Incubate for 20 - 30 min at room temperature, afterwards inactivation for 5 min at 70 °C. Then: store at -20 °C or transform.

Prefix Insertion

• Digestion of insert: at least 700 ng DNA / 10 µL volume, 1 µL 10x BamHI buffer, 0.5 µL EcoRI, 0.5 µL SpeI. Digest for 2 h at 37 °C, afterwards inactivation for 20 min at 80 °C. Clean up the insert via gel electrophoresis. When cutting the insert out of the gel try to avoid staining or exposure to ultraviolet light of the insert.

• Digestion of vector about 700 ng DNA / 10 µL volume, 1 µL 10 x Tango buffer, 0.5 µL EcoRI, 0.5 µL XbaI. Digest for 2h at 37 °C, afterwards inactivation for 20 min at 80 °C. Add 1 µL SAP (shrimp alcaline phosphatase) and 1.2 µL 10 x SAP buffer, incubate for 1 h at 37 °C. Clean up the vector with a PCR clean-up kit.

• Ligation: after digestion and clean-up: 50 - 200 ng of vector, 3 - 10 fold molar access of insert, 20 µL ligation volume, 2 µL T4-Ligase-Buffer, 1 µL T4-Ligase. Incubate for 20 - 30 min at room temperature, afterwards inactivation for 5 min at 70 °C. Then: store at -20 °C or transform.

Variations

• A digestion over night is possible. If you digest over night use only 0.1 µL restriction enzyme.

• It is also possible to use PCR product as insert. Digest after PCR with corresponding restriction enzymes and clean up with PCR clean-up kit. This could lead to higher yields of insert DNA because a lot of DNA gets lost during the gel electrophoresis clean up.

• Sometimes some BioBricks are hard to assemble. Then you have to clean up the vector by gel electrophoresis as well.

Standard Freiburg BioBrick Assembly

modified from [http://openwetware.org/wiki/Silver:_BB_Strategy Silver lab] and [http://partsregistry.org/Assembly_standard_25 Assembly standard 25]:

This assembly method can be used for fusion protein assemblies with BioBricks which are bigger than 150 bp. The BioBrick should be at least 500 bp bigger or smaller than the backbone. The BioBrick, which complies with these conditions, is used as the insert and is assembled into the prefix or suffix of the other used BioBrick, which is called vector and needs to be available in the BioBrick [http://partsregistry.org/Assembly_standard_25 Assembly standard 25]. You have to differentiate between a prefix and a suffix insertion.

Suffix Insertion

• Digestion of insert: at least 700 ng DNA / 10 µL volume, 1 µL 10x NEB buffer 4 + 0.1 µL 100x BSA, 0.5 µL NgoMIV (NEB), 1 µL PstI. Digest for 2 h at 37 °C, afterwards inactivation for 20 min at 80 °C. Clean up the insert via gel electrophoresis. When cutting the insert out of the gel try to avoid staining or exposure to ultraviolet light of the insert.

• Digestion of vector about 700 ng DNA / 10 µL volume, 1 µL 10x orange buffer, 0.5 µL AgeI, 0.5 µL PstI. Digest for 2 h at 37 °C, afterwards inactivation for 20 min at 80 °C. Add 1 µL SAP (shrimp alcaline phosphatase) and 1.2 µL 10x SAP buffer, incubate for 1 h at 37 °C. Clean up the vector with a PCR clean-up kit.

• Ligation: after digestion and clean-up: 50 - 200 ng of vector, 3 - 10 fold molar access of insert, 20 µL ligation volume, 2 µL T4-Ligase-Buffer, 1 µL T4-Ligase. Incubate for 20 - 30 min at room temperature, afterwards inactivation for 5 min at 70 °C. Then: store at -20 °C or transform.

Prefix Insertion

• Digestion of insert: at least 700 ng DNA / 10 µL volume, 1 µL 10x orange buffer, 0.5 µL EcoRI, 0.5 µL AgeI. Digest for 2 h at 37 °C, afterwards inactivation for 20 min at 80 °C. Clean up the insert via gel electrophoresis. When cutting the insert out of the gel try to avoid staining or exposure to ultraviolet light of the insert.

• Digestion of vector about 700 ng DNA / 10 µL volume, 1 µL 10 x NEB buffer 4, 0.5 µL EcoRI, 0.5 µL NgoMIV (NEB). Digest for 2h at 37 °C, afterwards inactivation for 20 min at 80 °C. Add 1 µL SAP (shrimp alcaline phosphatase) and 1.2 µL 10 x SAP buffer, incubate for 1 h at 37 °C. Clean up the vector with a PCR clean-up kit.

• Ligation: after digestion and clean-up: 50 - 200 ng of vector, 3 - 10 fold molar access of insert, 20 µL ligation volume, 2 µL T4-Ligase-Buffer, 1 µL T4-Ligase. Incubate for 20 - 30 min at room temperature, afterwards inactivation for 5 min at 70 °C. Then: store at -20 °C or transform.

Variations

• A digestion over night is possible. If you digest over night use only 0.1 µL restriction enzyme.

• It is also possible to use PCR product as insert. Digest after PCR with corresponding restriction enzymes and clean up with PCR clean-up kit. This could lead to higher yields of insert DNA because a lot of DNA gets lost during the gel electrophoresis clean up.

• Sometimes some BioBricks are hard to assemble. Then you have to clean up the vector by gel electrophoresis as well.

Standard 3A assembly

Modified from [http://ginkgobioworks.com/support/BioBrick_Assembly_Manual.pdf BioBrick Assembly Manual by Ginkgo BioWorks]

Digestion

• Thaw DNA from upstream and downstream part and the destination plasmid on ice.

• • Destination plasmid has to carry the ccdB gene <partinfo>P1010</partinfo> as insert and has to have a different antibiotic resistance than the plasmids carrying the upstream and downstream parts

• • DNA has to be cleaned (by MiniPrep or after a PCR)

• 500 ng DNA / digestion mix for upstream part, downstream part and destination plasmid (total volume of mix 10 µL, dilute with ddH₂0 if necessary)

• Add 1 µL of 10x buffer and restriction enzymes as shown in the following table:

	Upstream part	Downstream part	Destination plasmid
enzyme 1	0.5 µL EcoRI	0.5 µL XbaI	0.5 µL EcoRI
enzyme 2	0.5 µL SpeI	1 µL PstI	0.5 µL PstI
buffer	BamHI	Tango	Orange

• Incubation of the digestion mixes at 37 °C

• After 2 h: add 0.5 µL SAP (shrimp alcaline phosphatase) and 1.15 µL 10x SAP buffer to destination plasmid mix, continue incubation at 37 °C

• After another hour: heat inactivation of all mixes for 20 min at 80 °C

• Continue with ligation or freeze the mixes

Ligation

• Ligation mix:

• • 2 µL ddH₂O

• • 5 µL of every digestion mix (so 15 µL in total)

• • 2 µL T4-DNA-ligase buffer (thaw on ice!)

• • 1 µL T4-DNA-ligase

• Incubate at least 20 min at room temperature, afterwards heat inactivation for 5 min at 70 °C (optional)

• Freeze ligation mix or continue with transformation (heatshock or electroporation)

Freiburg 3A assembly

Modified from [http://ginkgobioworks.com/support/BioBrick_Assembly_Manual.pdf BioBrick Assembly Manual by Ginkgo BioWorks] and [http://partsregistry.org/Assembly_standard_25 Assembly standard 25]

Digestion

• Thaw DNA from upstream and downstream part (=N-terminal and C-terminal protein domain) and the destination plasmid on ice.

• • Destination plasmid has to carry the ccdB gene <partinfo>P1010</partinfo> as insert and has to have a different antibiotic resistance than the plasmids carrying the upstream and downstream parts

• • DNA has to be cleaned (by MiniPrep or after a PCR)

• 500 ng DNA / digestion mix for upstream part, downstream part and destination plasmid (total volume of mix 10 µL, dilute with ddH₂0 if necessary)

• Add 1 µL of 10x buffer and restriction enzymes as shown in the following table:

	Upstream part	Downstream part	Destination plasmid
enzyme 1	0.5 µL EcoRI	0.5 µL NgoMIV	0.5 µL EcoRI
enzyme 2	0.5 µL AgeI	1 µL PstI	0.5 µL PstI
buffer	Orange	NEB buffer 4 + BSA	Orange

• Incubation of the digestion mixes at 37 °C

• After 2 h: add 0.5 µL SAP (shrimp alcaline phosphatase) and 1.15 µL 10x SAP buffer to destination plasmid mix, continue incubation at 37 °C

• After another hour: heat inactivation of all mixes for 20 min at 80 °C

• Continue with ligation or freeze the mixes

Ligation

• Ligation mix:

• • 2 µL ddH₂O

• • 5 µL of every digestion mix (so 15 µL in total)

• • 2 µL T4-DNA-ligase buffer (thaw on ice!)

• • 1 µL T4-DNA-ligase

• Incubate at least 20 min at room temperature, afterwards heat inactivation for 5 min at 70 °C (optional)

• Freeze ligation mix or continue with transformation (heatshock or electroporation)

Restriction analysis

• Digest BioBrick of interest: about 400 ng DNA / 10 µL volume, 1 µL 10x orange buffer, 0.5 µL NotI or PstI. Digest for 2 h at 37 °C. NotI is used to determine the length of the BioBrick and the plasmid backbone, PstI ist used to determine the length of the BioBrick in the plasmid backbone.

• Gel electrophoresis: add 2 µL loading buffer to every digestion mix, apply about 100 - 200 ng DNA / pocket in gel. Don't forget to apply the uncut BioBrick as well. A good agarose concentration for BioBricks between 0.2 and 3 kb is 1.5 %. The smaller your BioBrick of interest is the higher the agarose concentration should be and vice versa. The gel electrophoresis is made with TAE-buffer. Be sure that you melt your agarose gel in the same buffer you use for the electrophoresis later.

Bisphenol A analysis

Extraction with ethylacetate

• mix sterile filtered culture supernatant with equal volume of ethylacetate (HPLC grade)
• vortex (30 s)
• centrifuge for phase separation (5 min, 5000 g)
• take a bit from upper phase and put it in a clean eppi
• SpeedVac at 40 °C to remove ethlyacetate
• solve remaining BPA in water (HPLC grade)

HPLC method

Used enzymes

Enzyme	Producer
KOD Hotstart DNA-polymerase	Novagen
NgoMIV	NEB
OneTaq DNA-polymerase	NEB
Pfu DNA-polymerase	Promega
Phusion DNA-polymerase	Finnzymes
Restriction enzymes (except NgoMIV)	Fermentas
Shrimp alcaline phosphatase	Fermentas
T4-DNA-Ligase	Fermentas
taq DNA-polymerase	Bioline

Used Kits

Function	Name
Plasmid purification	Fermentas GeneJET™ Plasmid Miniprep Kit
Plasmid purification	Promega PureYield™ Plasmid Preps
PCR Cleanup	Macherey Nagel NucleoSpin® Extract II
PCR Cleanup	Promega Wizard® SV Gel and PCR Clean-Up

Media, buffer, solutions etc.

TAE buffer

For 1 L of 50 x TAE buffer you need:

• 242.48 g Tris

• 41.02 g Sodiumacetate

• 18.612 g EDTA

• Adjust pH to 7.8 with acetic acid

• Solve in dH₂O

10 mL of the stock is diluted in 1 L dH₂O for the gel electrophoresis (0.5 x TAE buffer).

DNA loading buffer

• 50 % (v/v) glycerol

• 1 mM EDTA

• 0.1 % (w/v) bromphenol blue

• Solve in ddH20

LB medium

For 1 L of LB medium you need:

• 10 g Trypton

• 5 g yeast extract

• 10 g NaCl

• 12 g Agar-Agar (for plates)

• Adjust pH to 7.4