Brandon:Protocols/tn5 production updated 9 3 2014

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Tn5 production protocol and validations (9/3/2014 updated)[edit]

  • changes this time are using 1.0 M NaCl and 0.5% TX100 for the columna washing buffer, HEGX. This is .2 M higher NaCL and .3% higher TX100, since that is what is mentioned in the "IMPACT™-CN, Protein Purification System Now Featuring Fusion to C- or N- Terminus of the Target Protein" kit. with .5% TX100 being the upper recommended limit for functionality of the beads.
    • This should clean the beads/protein more efficiently.


  • Also performing washes in the 50 mL conical after binding to chitin beads, then will wash again on column. Before only did ~10 column volumes of bead washing once beads were added to the column.


  • The cleavage buffer will be the same as the original protocol, except for reduced TX100 to .05% since it will be concentrated. The column wash buffer will not be used as the cleavage buffer.


  • hopefully this will give more pure Tn5 without proteins degrading RNA in the final isolated mixture.


buffer https://www.neb.com/products/e6901-impact-kit Intein Mediated Purification with an Affinity Chitin-binding Tag

  • Grown on Luria broth, E. coli cells


  • Things in bold are changed or what was actually used and differed slightly from the protocol.


Supplies order list[edit]

Reagent Vender Catalog Number Unit Price
T7 Express lysY/Iq Competent E. coli (High Efficiency) NEB C3013I (6x0.2ml/tube) 140
Core Bio Service C3013I (6x0.2ml/tube) 113.16
NEB C3013H (20x0.05ml/tube) 179
Chitin Resin NEB S6651S (20ml) 69
Core Bio Service S6651S 57.93
NEB S6651L (100ml) 276
SOC Medium NEB B9020S (4x25ml medium) 71
Life/Invitrogen 15544-034 (10x10ml) 89.76
LB Agar Ampicillin - 50ug/ml, Plates Sigma-Aldrich L0168-10EA 32
LB Agar Plates with Ampicillin-100. 100mm Plates, 20 pack Core Bio Service L1004 24.5
Ampicillin Ready Made Solution, 100mg/ml, 0.2um Filtered Sigma-Aldrich A5354-10ML 79.1
Ampicilin, sodium salt
Agar (Purified) Sigma-Aldrich 05039-50G 19.4
LB Broth with agar (Lennox) Sigma-Aldrich L2897-250G 78.1
LB Broth (Lennox) Sigma-Aldrich L3022-250G 40.7
IPTG (powder, 1G) Thermo Scientific R0391 (1gram) 44
Sigma-Aldrich I6758-1G 56.6
Life/Invitrogen 15529-019 59.16
PEI Sigma-Aldrich P3143-100mL 38.5
Econo-Pac Chromatography Column Bio-Rad 732-1010 138
DTT Thermo Scientific R0861 (5grams) 78
Sigma-Aldrich D9779-5G 131
HEPES Solution (pH 7.0-7.6) Life/Gibco 15630-106 (20mL) 18.5
Triton X-100 (100mL) Sigma-Aldrich X100-100ML 32.9



Buffers List[edit]

NOW USING 1.0 M NaCl AND 0.5% TRITON-X 100 FOR 1X HEGX, WASH BUFFER ONLY

CLEAVAGE BUFFER WILL BE 0.8 M NaCl, AND 0.05% TRITON-X 100

  • 1X HEGX
20 mM Tris HCl pH 7.5
1.0 M NaCl
1 mM EDTA
10% glycerol
0.5% Triton-X 100
  • 2X HEGX
                        to make 1L
40 mM Tris HCl pH 7.5   20 mL of 2M
2.0 M NaCl              116.88 g
2 mM EDTA               0.58448 g or 4 mL of 500 mM
20% glycerol            200 mL
1.0% Triton-X 100       10 mL


  • 2X Cleavage buffer (need to add DTT still): WILL BE 0.8 M NaCl, AND 0.05% TRITON-X 100 FINAL CONCENTRATION
                       to make 50 mL
40 mM Tris HCl pH 7.5  1 mL of 2M
1.6 M NaCl             4.6752 g
2 mM EDTA              200 uL of 500 mM
0.1% Triton-X 100      50 uL
20% glycerol           10 mL


  • 2xTn5 dialysis Bf: WITH TRIS-HCL INSTEAD
                                1L (H20 added to vol.)
100 mM Tris HCl, pH 7.5         50 mL 2M	
200 mM NaCl			11.69 g NaCl
0.2 mM EDTA			400 uL 500 mM
2 mM DTT			2 mL 1M (309 mg)
0.05% Triton X-100		500 uL Triton X-100
20% Glycerol			252 g 100% Glycerol


  • Tn5 storage Bf: WITH TRIS-HCL INSTEAD
                         100 mL (+42 mL H20)      1L                2L
50 mM Tris HCl, pH 7.5   2.5 mL 2M                25 mL 2M          50 mL 2M
100 mM NaCl		 2 mL 5M                  5.844 g           11.69 g
0.1 mM EDTA		 20 uL 500 mM             200 uL of .5M     400 uL of .5M
1 mM DTT		 0.1 mL 1M                0.154 g           0.309 g
0.05% Triton X-100	 500 uL 10% (25 uL 100%)  500 uL 100%       1000 uL 100%
50% Glycerol		 63 g 100% Glycerol       500 mL            1000 mL



Buffers etc to make checklist[edit]

  • start 5-10 mL cultures in morning
  • Autoclave LB, add amp, put into 37C overnight
  • make 2X HEGX
  • make PEI, .22 uM filter, pH to 7.5
  • make 2X Tn5 dialysis buffer
  • make tn5 storage buffer
  • make HEGX +100 mM DTT



I. Growth and Induction[edit]

  • 1. Transform C3013 E. coli cells (NEB) (C3013I/H, plasmid, SOC, AMP/LB broth/agar/culture plates) (use +/- controls of puc1 and no transformation)
    • a. For C3013H: Thaw a tube of T7 Express lysY/Iq Competent E. coli cells on ice for 10 minutes.
    • b. For C3013I: Thaw a tube of T7 Express lysY/Iq Competent E. coli cells on ice until the last ice crystals disappear. Mix gently and carefully pipette 50 µl of cells into a transformation tube on ice.
    • c. Add 1-5 µl containing 1 pg-100 ng of plasmid DNA to the cell mixture. Carefully flick the tube 4-5 times to mix cells and DNA. Do not vortex.
    • d. Place the mixture on ice for 30 minutes. Do not mix.
    • e. Heat shock at exactly 42°C for exactly 10 seconds. Do not mix.
    • f. Place on ice for 5 minutes. Do not mix.
    • g. Pipette 950 µl of room temperature SOC into the mixture.
    • h. Place at 37°C for 60 minutes. Shake vigorously (250 rpm) or rotate.
    • i. Warm selection plates to 37°C.
    • j. Mix the cells thoroughly by flicking the tube and inverting, then perform several 10-fold serial dilutions in SOC. (use half plate for each, 200 uL, 50 uL, 50 uL of 1:10, 50 uL of 1:100)'
    • k. Spread 50-100 µl of each dilution onto a selection plate (100 ug/ml amp) and incubate overnight at 37°C. Alternatively, incubate at 30°C for 24-36 hours or at 25°C for 48 hours.
  • 2. Pick colony for starter culture. Five cultures (~100 mL) of same clone grown up at 37C in 5-10ml overnight (O/N) (LB culture broth, amp at 100 μg/ml), starting in the morning. takes awhile to reach A600 of 0.9 the next morning. Put 1 liter LB into 37C incubator for next morning.
  • 3. In morning, 1 liter cultures inoculated with all starter cultures, 250 mL culture per 1L flask. 37C for 3hr to A600 ~ 0.9. (1L LB culture broth, amp at 100 μg/ml, 100 mg per 1L) (spectrophotometer to measure A600 in cuvettes)
  • 4. Chill cultures in ice water bath to about 10C CHILLED TO 23C, ADDED IPTG, THEN SHOOK AT RT
  • 5. Add 1M IPTG to 0.25mM (IPTG) (250 uL of 1 M IPTG per 1 L culture?, 4000X dilution)
  • 6. Grow 23C for 4hr to A600 ~ 3.0, or 15C overnight A600 ~ 1.175
  • 7. Centrifuge and freeze pellet (if resuspending to isolate pellet do in HEGX with a protease inhibitor tablet) -70C overnight and thaw in 80ml HEGX (BIG OL’ CENTRIFUGE,Scupula, Culture tubes 6000xg for 8 minutes)
  • STOPPING POINT

II. Sonicate (mixonix sonicator 3000)[edit]

  • 1. Make HEGX (HEGX: Tris-HCl (pH 7.5), NaCl, EDTA, Glycerol, TX-100, Complete)
  • 2. Resuspend pellet in 80 mL HEGX @ 0-4C, with complete protease inhibitors. added 8 roche complete protease inhibitor tablets (1 per 10 mL)
  • 3. Sonicate in HEGX in steel container 10-12 cycles of 45-50 bursts (0.5 seconds ON, 0.5 seconds OFF, (50% duty cycle)), output power level 7.0. ~15 minutes sonicating total. Temp should not go over 10C, keep consistently on salt ice bath at <4C, or cool on salt bath to -2C to -3C in between cycles. Immerse 1.5X tip diameter into solution, use 1/2 inch tip. Monitor temp with temperature probe with instantaneous feedback. Check transparency to see cell lysis after every few cycles. protein precipitates with over sonication. Solution turns translucent and less murky.
  • 4. Pellet 15K rpm, 30min 4C (BIG OL’ CENTRIFUGE)
  • 5. Keep supernatant and discard pellet


III. PEI precipitation (Mag stirrer)[edit]

  • 1. Make PEI:
    • a. total 12.5 mL
    • b. 2.7g 50% PEI
    • c. 5 ml H2O
    • d. 1.5 ml 37% HCl
    • e. 2 mL 5 M NaCl
    • f. 125 uL 2M Tris HCl pH 7.5
    • g. 7.5 uL 0.5 M EDTA
    • h. 250 uL Triton X-100 (0.2% TX100)
    • i. Adjust to 12.5 mL, 10% PEI (check pH and bring to pH 7.5)
    • j. Filter solution with .22 uM filter
  • 2. Add dropwise 2.1ml 10% PEI, stir briefly (PEI Sigma P3143)
  • 3. Collect precipitate at 12K, 10min, 4C; KEEP supernatant


IV. Chitin column[edit]

Without transposons


  • 1. Wash Chitin resin. take 15 mL of resin, let settle or spin down in 50 mL conical at 100xg for <1 minute with slow setting 5 for deceleration of centrifuge. Wash 5X with 1X HEGX (.5% TX100), remove supernatent with aspirator.
  • 2. Add supernatant from PEI to washed chitin resin in conical. Lightly mix on shaker for 3.5 hours at 4C.
  • 3. Wash bound chitin beads 10X with 1X HEGX (.5% TX100) in 50 mL conical. spin down at 100 xg for <1 minute with setting of 5 for deceleration of centrifuge, remove supernatent with aspirator.
  • 4. Add solution from conical to chromatography column, after draining put upper bed support on top, and wet with buffer.
  • 5. Wash with 20-30 volumes (200-300 ml) HEGX at gravity flow (2-4 ml/min) at 4C OR wash overnight at 0.2ml/min at 4C
  • 6. Add 30 ml Cleavage buffer +100 mM DTT to column.
    • a. 462.75 mg DTT in 30 mL (2.5 mL 1M DTT)
    • b. 15 mL 2X Cleavage Buffer
    • c. 14.5 mL H20
    • d. 30 mL Final volume
  • 7. Run out until ~7-8 mL (not including beads) cleavage buffer is in column, stop flow and leave at 4C for at least 36 hours (over weekend) Did for 63 hours last time
  • 8. Elute first fraction of ~5 drops to discard (dead volume, no protein). Then elute ~10 fractions of 10 drops (~500 uL), then 12x20 (~1 mL) drop fractions.
  • 9. (optional) Leave the column in the remaining Cleavage buffer +100 mM DTT for 24h. (Checked: Up to 30% may be in elute2).

With Transposons

  • 1. Add supernatant from PEI precipitation to 10ml Chitin column at 0.4ml/min in HEGX (~3.5 hours) at 4C.
  • 2. Wash with 10-20 volumes HEGX, (100-200 mL) at gravity flow at 4C (~4 mL a minute = 25 mins)
  • 3. Repeat wash with 2 column volumes (200 mL) degassed HEGX at gravity flow at 4C
  • 4. Add 8 mL degassed HEGX containing (at least) 200 nmoles of mixed Tn5MEDS-A/-B oligonucleotides to the column (oligos, degassed? HEGX)
  • 5. Leave column at room temp overnight
  • 6. Wash with 20 volumes HEGX to remove free transposons at 4C.
  • 7. Add 25 ml HEGX, 100 mM DTT to column.
    • a. 385.6 mg DTT in 25 mL (2.5 mL 1M DTT)
    • b. 12.5 mL 2X HEGX
    • c. 12.1 mL H20
    • d. 25 mL Final volume
  • 8. Run out 15 mL, stop flow and leave at 4C for at least 36 hours (over weekend)
  • 9. Elute 6 fractions of 20 drops, then 12x30 drop fractions.
  • 10. (optional) Leave the column in the remaining HEGX, 1M DTT for 24h. (Checked: Up to 30% may be in elute2).


V. Dialysis (dialyzer)[edit]

  • 1. Make 2X dialysis buffer and chill at 4C. Pool fractions with highest concentration. Test with biorad protein assay (bradford asssy) using 25 uL and 1 uL sample. pooled fractions 1-6, 7-10
  • 2. Dialyze at 4C versus one change of 1 L 2x Tn5 dialysis buffer. Dialysis is for 2 hours with intermittent stirring every ~30 mins. (will concentrate sample some)
  • 3. Measure A280 with nanodrop to get concentration (can take a small amount our of dialysis bag and leave the rest in, then don't have to change dialysis bags)
  • 4. Dialyze at 4C with 2 changes of 1 Liter tn5 storage buffer (50% glycerol). Dialysis is for 2 hours with intermittent stirring every ~30 mins. (will concentrate sample ~2X)

Tn5 dialysis buffer:

100mM Tris HCl, pH 7.5
0.2M NaCl
0.2mM EDTA
2mM DTT
0.025% TX100
20% Glycerol

Tn5 storage buffer:

50 mM Tris HCl, pH 7.5
100 mM NaCl
0.1 mM EDTA
1 mM DTT
0.025% Triton X-100
50% Glycerol
  • 5. Should be concentrated now, and in storage buffer (50% glycerol). Amicon filters results in protein denaturation and thus avoid using. Store at -20C.

If not dialyzing with storage buffer

  • 1. After dialysis if protein is concentrated enough an be used directly for transposome complex assembly. If not then put into storage buffer by adding 1.05 volume 99.5% glycerol and 0.33 volume of 2x Tn5 dialysis buffer (final 55% glycerol) and store at -20C.
  • 2. (optional) If not concentrated enough, use Amicon Ultracel 30 filters and spin at 3000 rcf for 25 mins with mixing every 10 mins at 4C until final OD280 >3.0. Then can perform the above step of transposome complex assembly and preparation for storage at -20C. concentrating with filters greatly reduces specific activity of Tn5



Protocol summary from Gosta[edit]

Lab protocol for Tn5 prep 2014-03-27 Gösta Winberg and Rickard Sandberg added by us:

  • Tues: Transform C3013 bacterias and grow up plate overnight (amp selection)
  • Wed: Inoculate (several, like five 5 mL cultures with same clone in the morning. A600 of .9 takes a long time to reach) 5 mL culture and grow up overnight at 30C (amp selection).
  • Thurs: add all cultures to 1L culture, grow up, express protein, centrifuge, freeze -80 O/N
  • Fri: sonicate pellet debris, PEI precip, chitin column binding/wash, DTT cleavage and leave over weekend at 4C.
  • Mon: dialysis with 2X dialysis buffer, A280 molarity calculation. dialysis with storage buffer, and tn5 fragmentation assay


Thursday 27/3:

  • Thaw cell pellet and sonic in 80 mL HEGX, pellet debris.
  • PEI precipitation, pellet PEI-DNA precipitate.
  • Supernate to 7 mL Chitin column at 0.4 mL/min = 3,5 h.
  • Wash HEGX, 100 mL at 4 mL/min =gravity flow, 25 min
  • Last wash degassed 2 col. vol.
  • Add 8 mL degassed HEGX containing 200 nmoles of MEDS oligo (mixed 1030+1031 ds oligos). (Better to use at least 2x molar excess MEDS oligo)
  • A 7 mL column can bind max 200 nmoles of Tn5 fusion protein (28 nmoles/mL).
  • Leave O/N at RT for binding to the Tn5 protein.


Friday 28/3:

  • Move column to +4. Wash with HEGX to remove excess unbound oligo.
  • Add 20 mL HEGX, 100 mM DTT. Drain out 15 mL , then close the valve.
  • Leave column at +4 over weekend.


Mo 31/3:

  • Elute 4 fractions of 20 drops, then 12 x 40 drop fractions.
  • Test with BioRad protein assay: 25 uL + 1 uL of column fraction.
  • Pool most active fractions (most intense blue color).
  • Dialyze vs 2 x 1L Tn5 dialysis buffer at 4 C.


Tue 1/4:

  • Read OD280 vs dialysis buffer as blank.
  • Calculate Tn5 molarity (only approximately since the oligo influences the readings. Run Tn5 assay with 50 ng *High MW DNA as substrate, Run 1% agarose gel to check activity.



Validation of results[edit]

  • Successfully completely fragmented 6 ng or DNA, and partially fragmented 25 ng DNA. SDS-PAGE gel matches that which was provided by Gosta and Rickard.


  • After concentrating in amicon filters, A600 was 7.44 or 86.01 uM. Thus final concentration after added 1.05 volumes glycerol, .33 volumes 2X tn5 dialysis buffer (total of 2.38X dilution factor), is 36.13 uM in 5.84 mL.


6/10/2014

  • with 25 ng Jurkat DNA (unconcentrated transposase)
  • annealed sc1-T7tspn-NoP-bot to T7tspn-top2(10/30)
  • tsp complex made by incubating at RT for ~30 mins
  • reaction composition
2 uL 5X custom tagmentation buffer (D6)
1 uL pure Jurkat DNA (25 ng)
1 uL tspsome
1 uL 2X Lysis Buffer
5 uL Nuclease free water
_____________
10 uL total



6/11/2014

  • with 6 ng DNA (unconcentrated transposase)
  • annealed sc1-T7tspn-NoP-bot to T7tspn-top2(10/30)
  • tsp complex made by incubating at RT for ~30 mins
  • reaction composition
1 uL 5X tagmetnation buffer
1 uL pure Jurkat DNA (6 ng)
1 or 2 uL transposome complex
1 uL 2X Lysis buffer
1 or 0 uL H2O



  • Example of Tn5 band from gosta

File:ZhangLab 2 2014-06-11 Gosta SDS-PAGE gel image.png


  • original SDS-PAGE gel image

File:ZhangLab 2 2014-06-11 SDS-PAGE gel tn5 original image.jpg


  • SDS-PAGE gel with ladder labeled

File:ZhangLab 2 2014-06-11 SDS-PAGE gel tn5.png