Two H. volcanii uracil auxotrophic strains were developed
for constitutive GFP-expression and cell imaging by CLSM
and epifluorescence microscopy (see Additional file 1:
Table S2). The strain H1206(pJAM1020) was based on
selection through novobiocin resistance using a previously
developed vector [59], and a second strain H1206
(pSC409GFP) was based on the gene pyrE2 and uracil
autotrophy [44,46,47]. Plasmid pSC409GFP was constructed
by amplifying the region from pJAM1020
containing red-shifted GFP and P2 promoter for constitutive
expression in haloarchaeal species [59], and
inserting this construct into the shuttle vector pTA409
[101] (see Additional file 1: Tables S2 and S3). Each plasmid
was transformed into the strain H1206 (ΔpyrE2 Δmrr)
using the PEG-based method as previously developed
[49,102,103], and transformants were selected on Hv-
Ca medium without uracil for H1206(pSC409GFP) orcontaining novobiocin for H1206(pJAM1020). H. volcanii
H1206 is identical to H26 other than an additional deletion
of the mrr gene, which encodes a restriction endonuclease
that cleaves methylated foreign DNA, allowing transformation
without passage through an Escherichia coli dam
mutant [46]. Growth kinetics of each GFP strain in liquid
Hv-YPC medium were measured by optical density and
were unchanged from the parental strain
Two H. volcanii uracil auxotrophic strains were developedfor constitutive GFP-expression and cell imaging by CLSMand epifluorescence microscopy (see Additional file 1:Table S2). The strain H1206(pJAM1020) was based onselection through novobiocin resistance using a previouslydeveloped vector [59], and a second strain H1206(pSC409GFP) was based on the gene pyrE2 and uracilautotrophy [44,46,47]. Plasmid pSC409GFP was constructedby amplifying the region from pJAM1020containing red-shifted GFP and P2 promoter for constitutiveexpression in haloarchaeal species [59], andinserting this construct into the shuttle vector pTA409[101] (see Additional file 1: Tables S2 and S3). Each plasmidwas transformed into the strain H1206 (ΔpyrE2 Δmrr)using the PEG-based method as previously developed[49,102,103], and transformants were selected on Hv-Ca medium without uracil for H1206(pSC409GFP) orcontaining novobiocin for H1206(pJAM1020). H. volcaniiH1206 is identical to H26 other than an additional deletionof the mrr gene, which encodes a restriction endonucleasethat cleaves methylated foreign DNA, allowing transformationwithout passage through an Escherichia coli dammutant [46]. Growth kinetics of each GFP strain in liquidHv-YPC medium were measured by optical density andwere unchanged from the parental strain
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