CGSC Strain#: 12325
Strain Designation: DH5α/pEXT20     
Source of Strain: T. Linn
Other Designations: DH5alpha/pEXT20
Other Designations: pEXT20
Sex: F-
Episome/Plasmid: pEXT20
Plasmid Markers/Mutations: bla(ApR)
,
lacIp-4000(lacIQ) Chromosomal Markers: Δ(argF-lac)169, φ80d
lacZ58(M15),
ΔphoA8,
glnX44(AS)
,
λ-,
deoR481,
rfbC1,
gyrA96(NalR)
,
recA1,
endA1,
thiE1,
hsdR17Strain Comments: - Δ(argF-lac)169-- extends from mmuP through orfs preceding argF, through lac to mhpD, literally Δ(mmuP-mhpD)169. (Peters et al. 2003 JB 185:2017)
- Δ(argF-lac)169-- from strain Hfr3000 U169 was initially called ΔlacU169 and described as a lacZY mutation until found to include argF and lacI.
- glnX44(AS)-- Mutation is a C to T transition at nucleotide 34 (3rd position of the anticodon)
- deoR481-- A selectable phenotype of deoR mutants includes the ability to grow preferentially on minimal medium with inosine as the sole carbon source.
- gyrA96(NalR)-- resistant to 200ug/ml nalidixic acid
- gyrA96(NalR)-- GAC to AAC at codon 87
- recA1-- : Missense mutation, altered isoelectric point. Sequenced: G to A for Nuc. 720 (Gly 160 Asp).
- endA1-- G to A transition mutation resulting in E208K amino acid substitution.
- glnX44(AS) was formerly called su+II
- glnX44(AS) was formerly called supE44
- glnX44(AS) was formerly called glnV44
- gyrA96(NalR) was formerly called
- rfbC1 was formerly called rfbD1
- thiE1 was formerly called thi-1
- = good miniprep dsDNA quality
- AS = amber(UAG) suppressor
- NalR = Nalidix.acidResist.
- ApR = ampicillin resistant
References: - Dykxhoorn, DM, R St Pierre, T Linn 1996. A set of compatible tac promoter expression vectors. Gene 177(1-2):133-6.