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Quikchange 2 site directed mutagenesis kit

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The QuikChange II Site-Directed Mutagenesis Kit is a laboratory equipment product used for introducing site-specific mutations into double-stranded plasmid DNA. The kit provides a rapid and efficient method for performing these mutations.

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865 protocols using quikchange 2 site directed mutagenesis kit

1

Plasmid Construction and Mutagenesis

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The plasmid encoding the FN3 monobody G9 targeted against Fyn’s SH3 domain was a generous gift from Emeritus Professor Brian Kay (University of Illinois at Chicago, Illinois, US). The G9 monobody was subcloned into the pmEos2-N1 plasmid [38 (link)] (MB-anti-SH3-mEos2) by inserting BamHI and EcoRI restriction sites at the N- and C-termini of the monobody, followed by BamHI/EcoRI digestion and ligation into the mEos2 vector. Fyn mutant constructs were generated by site-directed mutagenesis, using the QuikChange II site-directed mutagenesis kit (Agilent), and the mEos2-N1 donor vector containing full-length human Fyn isoform 1 [27 ] as a template. Tau-P301L mutant constructs were generated by site-directed mutagenesis, using the QuikChange II site-directed mutagenesis kit (Agilent), and the pEGFP-N1 donor vector containing the 2N4R human FTLD P301L mutant Tau as a template [27 ]. All generated plasmids were sequenced by the GRS sequencing facility (Genetic Research Services, The University of Queensland). 3-(4-Chlorophenyl)-1-(1,1-dimethylethyl)-1H-pyrazolo[3,4-d]pyrimidin-4-amine (PP2) and 1-phenyl-1H-pyrazolo[3,4-d]pyrimidin-4-amine (PP3) were purchased from Calbiochem (Merck/Millipore). The aliphatic alcohol 1,6-hexanediol (1,6-HD) was purchased from Sigma (MilliporeSigma).
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2

Molecular Cloning and Mutagenesis of Ubiquitin and α-Synuclein

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Human ubiquitin was polymerase chain reaction (PCR)–amplified from pcDNA3-HA-ubiquitin (gift from E. Yeh, Addgene plasmid #18712) (50 (link)) and cloned with a VN tag into pcDNA3. Subsequently, α-synuclein–VC and VN-ubiquitin were cloned into a single backbone with pIRES2 to drive simultaneous expression of both proteins with the same promoter, using the NEBuilder HiFi DNA assembly [New England Biolabs (NEB)] kit. Rab5Q79L was generated by site-directed mutagenesis of mRFP-Rab5 (gift from A. Helenius, Addgene plasmid #4437) (51 (link)), using the QuikChange II site-directed mutagenesis kit (Agilent). mRFP-NBR1 was generated by replacing Rab5 cDNA in the mRFP-Rab5 plasmid with NBR1 cDNA amplified from pMXs-puro-mCherry-NBR1 (gift from J. Debnath, Addgene plasmid #74242) (52 (link)) using the NEBuilder HiFi DNA assembly (NEB) kit. mRFP-NBR1ΔUBD was generated by adapting mRFP-NBR1 using the QuikChange site-directed mutagenesis kit. WT α-synuclein–pHluorin was cloned using pCMV-lyso-pHluorin (gift from C. Rosenmund, Addgene plasmid #70113) (53 (link)), and 3KR was generated using the QuikChange II site-directed mutagenesis kit (Agilent). PCR-based site-directed mutagenesis was also performed to introduce mutations in VN-ubiquitin (K48R, K63R, K48R/K63R, and ΔGG) and α-synuclein–VC (3KR, 4KR, and S129A). All newly constructed plasmids were validated by sequencing (Eurofins).
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3

Engineered HER2 mutant constructs

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A pFastbac-HTb vector encoding the WT HER2 cytoplasmic domain (Uniprot ID = P04626, residues 703–1029) was utilized as template cDNA (Guo et al., 2018 (link)). The D769Y point mutation and the P780insGSP insertion mutation were introduced using the protocol from the QuikChange II Site-Directed Mutagenesis Kit (Agilent). Recombinant baculoviruses were generated using the Bac-to-Bac system (Invitrogen) and were used to infect Spodoptera frugiperda Sf9 cells for 72 h in 1-L spinner flasks. His-tagged HER2 proteins were purified via Ni-NTA chromatography as previously outlined (Guo et al., 2018 (link)). The pcDNA3 mammalian expression plasmid encoding full-length HER2 was a gift from Dr. L. Neckers (NIH). The mutations were introduced using the QuikChange II Site-Directed Mutagenesis Kit (Agilent).
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4

Plasmid Constructs for Treacle and TOPBP1 Expression

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The pcDNA4-TO-strep-HA-GFP-Treacle construct for GFP-Treacle expression, the deletion mutants F1-F5 and the point mutant S171A/T173A/T203A/T210A (STTT) has been described21 (link). Mutant derivatives S1236A, S1227A/S1228A and S1227A/S1228A/S1236A of this construct were generated by site-directed mutagenensis using the QuikChange II Site-Directed Mutagenesis kit (Agilent Technologies). Sequences of the mutagenesis primers were:
S1236A forward: GGAGAGACTGGGCTGGCGCCACATC
S1236A reverse: GATGTGGTGGCGCCAGCCCAGTCTCTCC
S1227A/S1228A forward: GAGACCGCAGCAGCAGAGGCCGCCGAGGATGATGTGGTG
S1227A/S1228A reverse: CACCACATCATCCTCGGCGGCCTCTGCTGCGGTCTC
pcDNA5/FRT/TO-NBS1-mNG were generated by PCR amplification of mNG from pmNeonGreen-C1 (Allele Biotechnology) and ligation into pcDNA5/FRT/TO-NBS1-WT, -R28A, -K160M and R28A/K160M, respectively50 . Plasmids pIRES V5 I-Ppo1 and pIRES I V5 -Ppo1(H98A) for I-Ppo1 mRNA purification (gift from Brian McStay) were described16 . pIRESneo2-TOPBP1-WT, -K154A/K155A (BRCT1), -K704A (BRCT5), -K1317A (BRCT7) were described37 (link),51 (link),52 (link). The mutant derivative W1145R of this construct was generated by site-directed mutagenensis using the QuikChange II Site-Directed Mutagenesis kit (Agilent Technologies). Sequences of the mutagenesis primers were:
W1145R forward: GCCTTCCCAAAATGAACAGATCATTCGGGATGACCCTAC
W1145R reverse: GTAGGGTCATCCCGAATGATCTGTTCATTTTGGGAAGGC.
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5

Generation and Cloning of Mx Protein Mutants

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As previously described, MxA wild-type cDNA was cloned into pcDNA3.1(+)neo (Invitrogen) (55 (link)). MxA(R640A) cDNA in the pcDNA3.1(+)neo plasmid was kindly provided by Georg Kochs (Freiburg, Germany). MxA mutant D250N was generated using the QuikChange II site-directed mutagenesis kit (Agilent). Primers were designed using PrimerX (http://www.bioinformatics.org/primerx/) with the QuikChange protocol.
MxB cDNA with or without an N-terminal FLAG peptide sequence or MxB cDNA with an N-terminal large T-antigen NLS peptide with or without a FLAG peptide were cloned into pcDNA3.1(+)neo (Invitrogen) using the NotI and XbaI restriction sites. Plasmids encoding FLAG-Mx1 or FLAG-Mx1(K49A) were previously described (37 (link)). The TMx1-encoding plasmid was described previously (4 (link)). Primers were designed using PrimerX with the QuikChange protocol.
gBlocks for untagged MxA-MxB chimera were synthesized by Integrated DNA Technologies (IDT) and cloned into the multiple-cloning site of pcDNA3.1(+)neo. T103A and T151A mutants were generated using the QuikChange II site-directed mutagenesis kit (Agilent). Primers were designed using PrimerX with the QuikChange protocol.
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6

Engineered Murine Na,K-ATPase α1 Variants

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Wild type, murine Na,K-ATPase α1 subunit was subcloned into pcDNA3.1/myc-His (Invitrogen) from IMAGE clone 4951288, positioning the myc epitope and 6xHIS tag at the C terminus of Na,K-ATPase α1 subunit. The following site-directed mutagenesis strategy was chosen. Cysteines 244, 454-458-459 and a combination of all four cysteine residues were replaced by alanine and, as pilot experiments showed, resulted in production of a functional protein. Mutagenesis reactions were performed with the Quikchange II site-directed mutagenesis kits (Agilent). Mutagenesis primers were designed using the Agilent online primer design tool.
C244A (forward): GCCTTCTTCTCAACCAACGCTGTGGAAGGAACCGC;
CCC454/458/459AAA (forward): CTGAGTCGGCGCTCTTAAAGGCCATTGAAGTCGCCGCCGG CTCCGTGATGGAG.
All mutations were confirmed by sequencing the entire ATP1a1 cDNA. Plasmids were multiplied in E. coli and purified for transfection into HEK293 cells.
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7

SINEUP-GFP Deletion Mutants

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Δ5–14, Δ35–44, Δ65–74, Δ100–111, Δ100–111 Δ130–141, Δ130–141, and Δ1–30 Δ120–167 deletion mutants (fragment 31–119) were created by using molecular cloning techniques. Briefly, fragment 31–119 (Δ1–30 Δ120–167) was chemically synthesized (Cell Guidance Systems, Cambridge, UK) and swapped with the full-length inverted SINE B2 sequence in SINEUP-GFP (Δ5′–32 nt); Δ5–14, Δ35–44, Δ65–74, Δ100–111, Δ100–111 Δ130–141 and Δ130–141 deletion mutants were mutagenized by using QuikChange II site-directed mutagenesis kits (Agilent Technologies Inc., Santa Clara, CA, USA) in accordance with a protocol published previously (11 (link),30 ).
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8

Site-Directed Mutagenesis Protocol

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Mutagenesis reactions were performed with the Quikchange II site-directed mutagenesis kits (Agilent). Mutagenesis primers were designed using the Agilent on-line primer design tool.
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9

Generating Dual Vector Baculovirus

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pFastBac Dual vector encoding both wild type rTAP1 and rTAP2a was kindly gifted by Dr. Gaudet (33 (link)). Mutations were made using QuikChange II Site-Directed Mutagenesis Kits (Agilent Technologies). All the primers were purchased from Invitrogen. All sequences were confirmed by DNA sequencing at the University of Michigan Sequencing Core. Baculovirus stocks were prepared according to the Bac-to-Bac manual (Invitrogen).
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10

Molecular Tools for ISG15 Signaling

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Plasmids pCMV-HA-ISG15, pSG5-UBE1L, pCMV2-UBCH8, pcDNA4-USP18, pCGN-KRAS(G12V), pPUR and pRetroX-IRES-ZsGreen1-USP18 were described before (6 (link),8 (link),18 (link)). Lentiviral pCMV-dR8.2 dvpr and pMD2.G plasmids were purchased (Addgene) along with the pCMV-GFP-USP18 plasmid (GeneCopoeia). Candidate TRC pLKO.1 lentiviral shRNAs repressing USP18 were purchased from GE Dharmacon. Respective vector controls were purchased. QuikChange II Site-Directed Mutagenesis Kits (Agilent) rendered pcDNA4-USP18 enzymatically-inactive, as described (8 (link)). DNA sequence analysis confirmed desired engineered species. RISC-free control siRNA and two siRNAs independently targeting USP18 were purchased (GE Dharmacon). These sequences were: murine USP18 siRNA 1 (5′-CGTTGTTTGTCCAGCACGA-3′), murine siRNA 2 (5′-AGGAACTCGAGGACGGAAA-3′), human USP18 siRNA 1 (5′-CTGCATATCTTCTGGTTTA-3′), and human USP18 siRNA 2 (5′GGAAGAAGACAGCAACATG-3′). Plasmids and siRNAs were transfected into desired cells using Lipofectamine 2000 reagent (Invitrogen) and Opti-MEM medium (Gibco Thermo Scientific).
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