Team:Stanford/Notebook/Lab Work/Week 4

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7/19 Monday

Laura's Notebook

set up the following ligations from the gel extractions done by me, Karina, and Francisco on Friday, 7/14/10)

• Francisco ran and imaged diagnostic gel on Friday

• normally run for 10 minutes at room temperature, overnight this time (started at 11:30 am)

Nanodrop data (deemed unreliable based on 260/230, possibly due do residual EtBr contamination)

Karina's Notebook

Goal: Laura will ligate GFP and RFP and ligate them to terminators. We received our RSID + RBS oligos in the mail, so I will work on the PCR. I first need to make freezer stock and working stock of oligos. Won't start PCR until after lunch because we'll leave them overnight with Chris' PCR reactions.

Make Tris-HCl
Need .01 L of 10mM Tris-HCl solution. So, add 15.76 mg Tris-HCl to 10 mL H20.

• Hard to weigh out 15.8 mg, so instead got to 18.3 mg.
• Determined that need to add this to 11.6 mL H20
  

Make Freezer Stock of Oligos
Want 100 uM solution of Tris-HCl solution

• Amount of Tris-HCl to add depends on how much of the oligo's we received.

Make Working Stock
Want a 10uM working stock solution

• 900 uL water + 100 uL Freezer Stock Solution
  
  

PCR Assembly
PCR Protocol calls for:
1.25 uL reverse primer
1.25 uL forward primer
DNA Template
50 uL PCR supermix

• For PCR Assembly, do not need DNA template. Also, add 4 times as much of each primer for PCR assembly.
  

Revised Recipe
5 uL Forward Primer
5 uL Reverse Primer
40 uL PCR Supermix

• we'll be using awesome PCR supermix- KEEP ON ICE
• Ran PCR with Chris, left running overnight

Francisco's Notebook

• Helped Karina and Laura

7/20 Tuesday

Laura's Notebook

helped Alex with preparation of competent cells

• see protocol: [http://openwetware.org/wiki/Stanford/BIOE44:Module_1:Day3 Preparing Electrocompetent Cells]

ran diagnostic gel for PCR-assembled DNA (Karina set up PCR rxns yesterday)

• order on gel:

1. 100 bp ladder
2. RSID1/RBS
3. RSID2/RBS

Karina's Notebook

Goals: Run gel of PCR Assembly Product, gel extraction, digest, then run PCR clean up.

Make Gel

• Chris made me an 0.8% agarose gel
  
  

Load Gel

• added 10 uL loading dye directly into PCR tubes
• loaded 40 uL of each sample into wells
  
  

Gel Results

left to right: 1kb ladder, RSID1 PCR reactions A, B and C

left to right: 1kb ladder, RSID2 PCR reactions A, B and C

Analysis/Observations
Gel looked a little streaky to me, but we really only need the brightest bands (as circled). For next time:

• use 100 bp ladder (instead of 1 kb)
• Don't even bother with gel extraction after running a PCR. It is highly inefficient and a lot of DNA will be lost. Instead, run a a diagnostic gel to check that PCR assembly worked but then proceed to run a PCR cleanup and then digest.
  
  
• Gel with 100bp ladder:

left to right: 100bp ladder, RSID 1, RSID 2

Extraction
Extracted 1A, 1B, 2B, and 2C from the gel.

• extracted and incubated each of the samples separately. To combine, loaded 1A and 1B into one spin column and 2B and 2C into another. Loaded up to 800 uL, spun down, loaded, then spun again. Then continued to follow [http://molecool.wustl.edu/krolllab/Kroll_Lab_Protocols/Molecular%20Biology%20protocols/Cloning%20protocols%20folder/Gel%20extraction-Qiagen.pdf procedure].
  
  

PCR Assembly
Set up another PCR assembly of RSID 1 and RSID 2 so that we have samples that have not been gel extracted. Ran another three samples of each. Will let run overnight.

• Primers were designed to anneal at 55º, but set up a temperature gradient to test annealing at other temperatures.

Greg's Notebook

• Miniprepped pBAD, F2620, pSB1a2, pSB3c5
• Ran nanodrop diagnostic:

• Poured large gel
• Helped Chris with electroporation transformation

7/21 Wednesday

Laura's Notebook

today's digestions:

• RSID1, RSID2 (gel extracted from first PCR done by Karina)- digest with XbaI, PstI
  • run overnight; started at 11:30am
• promoters within backbones (I0500-from Greg's box, and F2620-from Chris' box)- digest with SpeI, then PstI (done by Francisco)
  • SpeI digest run for 3 hours, then heat killed 20 min. at 80oC, then PstI added overnight (to reduce enzyme competition for sites on the DNA, since recognition sequences are very close to each other)

Recipe:

Karina's Notebook

Goal: Left Laura to gel extract previous PCR product as I worked on the new PCR product. Today, must make and run a diagnostic gel, PCR clean up, then digest RSID 1 and RSID 2.

Make TAE
Need a 1 L solution; we have 50x TAE stock

• 20 mL 50x TAE + 980 mL H20
  
  

Make Gel
Want a 2% agarose gel because oligos are short (~220 bp).

• 1 g agarose + 50 mL TAE
• 10 uL EtBr
  

Also, made Chris an 0.8% agarose gel (to repay him for yesterday).

Load Gel
10 uL 100 bp ladder
1 uL dye + 1 uL DNA

Results

100bp ladder, RSID1 and RSID2 PCR reactions

Great! No difference in the annealing temperatures. All bands are clear and bright, can use all three samples for restriction digests.

PCR Cleanup
Used Qiagen MinElute PCR Purification Kit Protocol.

• 50 uL reaction, therefore use 250 uL buffer PB
• Followed protocol and eluted in 10 uL water.
  
  

Restriction Digest
Cut at X and P

Recipe

• 10 uL DNA
• 5 uL NEBuffer 2
• 5 uL BSA
• 1 uL Xba
• 1 uL Pst
• 28 uL H20

Total volume: 50 uL

Let run overnight in 37º waterbath

Francisco's Notebook

• Digested RSID+RBS's and promoter backbones
  • RSID1+RBS: digested with Xba1 and Pst1
  • RSID2+RBS: digested with Xba1 and Pst1
  • pBad (I0500): digested with Spe1, then heat inactivated, then digested with Pst1^
  • pLux (F2620): digested with Spe1, then heat inactivated, then digested with Pst1^

^The restriction enzymes were added one after the other so that they would not compete when binding to nearby stretches of DNA.

• Made 100uL of 10X BSA stock from 100X BSA stock.

• Laura ligated GFP and RFP inserts to terminator backbones on Monday. Ligated terminator backbones to itself (no insert added) as a control to check that the terminator backbone was cut at both E and X.

Greg's Notebook

• Ran restriction digest of miniprepped DNA
• Inoculated 3 tubes each with 5 mL LB and F2620, T9002, pSB3c5, pSB1a2, I0500, E0240
• Gel-extracted some stuff for Alex
• Did two electroporations

7/22 Thursday

Laura's Notebook

• did gel extraction (Qiaquick Gel Extraction Kit) on the following samples:

• • RSID1KP and RSID2KP- PCR done by Karina, then gel extracted prior to digestion, digestion done by Karina
  • RSID1LEO and RSID2LEO- PCR done by Karina, digested by Laura
• ran on 1.5% gel at 75V for 1 hour
  • 10uL ladder (1KB)
  • 1uL each sample + 1uL loading dye- in order on chart

Gels used for gel extraction

• Digested RSID's:

left to right: RSID1_KP (cut at X, P), RSID1 uncut ctrl, RSID1_LEO (cut at X, P), RSID2_KP (cut at X, P), RSID2 uncut ctrl, RSID2_LEO (cut at X, P)

• Digested Promoters:

Made 4 0.5L bottles of agar

• recipe:
  • 5 g bacto-peptone
  • 2.5 g yeast extract
  • 2.5 g NaCl
  • 6 g agar
  • 485 mL dH2O (did first bottle in graduated cylinder, powders shifted volume by 15 mL- 450 mL went up to 465 mL, mixed and added to bottle, then used 35 mL dH20 to rinse cylinder contents into bottle)

Karina's Notebook

Goal: Laura did gel extraction of RSIDs, F2620, and I500 this morning. We'll need to ligate the IDs to the promoters then transform, but must wait until Francisco gel etracts promoters. In the mean time, I helped Chris with his PCR cleanup:

Francisco's Notebook

• Digested RSID's did not show up in the diagnostic gel:

left to right: 1kb ladder, digested parts: pBad, pLux, RSID1, RSID2 (latter two not so visible)

• Rerun diagnostic gel for the RSID's, using high percentage gel and 100kb ladder:

left to right: 100bp ladder, RSID1_KP, RSID1_LEO, RSID2_KP, RSID2_LEO. Notes: loaded every other lane, KP lanes do not have visible bands, LEO lanes have very faint bands under high exposure

• Possible problems:
  • Gel extraction has low yield. Plan for next time: re-run PCR of RSID's, but forgo gel extract if PCR reaction is clean.
  • Not enough DNA was loaded in the gel. Plan for next time: try loading more volume of DNA

• We have prepared GFP-terminator and RFP-terminator ligations on Monday, and a control ligation with the terminator backbone and no insert on Wednesday. Hope to transform bacteria with those ligations soon.
  • Re-aliquoted 1000uL of electrompetent cells Alex prepared into 20 tubes of 50uL each. Stored in 80 deg C freezer and will start transformations on Friday.

7/23 Friday

Friday Recap Meeting

• Leader: Francisco

Laura's Notebook

designed primers for colony PCR

tips for primer design (from Smolke Lab, via Chris VanLang)

• 18-24 bases
• ~60oC annealing temperature
• avoid: high or low GC content, repeats of >3 bases
• for use in later sequencing reactions, place primers ~ 50 bp outside region of interest

primer sequences:

pBADfor: gattagcggatcctacctgacgc

2K3rev: GGAAGCCTGCATAACGCGAAGT

F2620for: gggtgggcctttctgcgtttatat

IA2rev: AGTGAGCTGATACCGCTCGC

pairs:

• pSB2K3, I0500 (pBAD)
• pSB1A2, F2620 (pLUX)

Francisco's Notebook

• Reran PCR assembly (30 cycles of 'YA' program) of RSID's+RBS
  • ran three reactions for RSID1+RBS (tubes labelled 1a, 1b, 1c) and RSID2+RBS (tubes labelled 2a, 2b, 2c)
  • annealing temperatures (deg C): 57.0, 55.2, 53.7 for a, b, c respectively.
  • gel results looked good:

left to right: 1a, 1b, 1c, 2a, 2b, 2c, 100bp ladder, 1a, 1b, 1c, 2a, 2b, 2c. Note: left of the ladder - 1ul sample + 1ul dye; right of the ladder - 5uL sample + 1uL dye.

• Transformed E. coli BW strain with ligations prepared earlier in the week: GFP-terminator, RFP-terminator, and terminator ligated with no insert (negative control). 0.5 uL of DNA was used for each transformation and the settings on the zapper was 2000 V, 25 uF, 200 ohms. Some of the cells sparked and had to be discarded. Incubated for almost an hour after electroporation, spun down the cells at 3000g for 3 min. Transferred cells to plates, and left the plates to incubate overnight.

• Saturday morning update: None of the plates had colonies. =(