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Table 3 Strains, plasmids and primers used in this study

From: Efficient synthesis of L-lactic acid from glycerol by metabolically engineered Escherichia coli

Strain/ Plasmid/Primer

Description/Genotype/Sequence

Source

Strainsa

  

MG1655

F- λ- ilvG- rfb-50 rph-1

[41]

LA01

MG1655 ΔpflB::FRT ΔfrdA::FRT-Kan-FRT; sequential deletion of pflB and frdA in MG1655

[15]

LA02

MG1655 Δpta::FRT ΔadhE::FRT ΔfrdA::FRT-Kan-FRT; sequential deletion of pta, adhE and frdA in MG1655

[15]

LA06

LA01 ΔldhA::FRT-Kan-FRT

This study

LA07

LA02 ΔldhA::FRT-Kan-FRT

This study

LA19

LA01 ΔmgsA::FRT ΔldhA::ldh

This study

LA20

LA02 ΔmgsA::FRT ΔldhA::ldh

This study

LA19ΔlldD

LA01 ΔmgsA::FRT ΔldhA::ldh ΔlldD::FRT

This study

LA20ΔlldD

LA02 ΔmgsA::FRT ΔldhA::ldh ΔlldD::FRT

This study

Plasmids

  

pCP20

reppSC101ts ApR CmR cI857 l PR flp+

[42]

pZSblank

Blank plasmid created by removing C. freundii dhaKL from pZSKLcf and self-ligating the plasmid (tetR, oriR SC101*, cat)

[11]

pWM91

f1(+) ori lacZ α of pBluescript II (SK+) mobRP4, oriR6K,SacB and AmpR

[39]

pZSKLMgldA

E. coli dhaKLM and gldA under control of PLtetO-1 (tetR, oriR SC101*, cat)

[11]

pZSglpKglpD

E. coli glpK and glpD under control of PLtetO-1 (tetR, oriR SC101*, cat)

[15]

pZSldh

S. bovis ldh under control of PLtetO-1 (tetR, oriR SC101*, cat)

This study

Primers b

  

v-pflB

aaatccacttaagaaggtaggtgtcgtggagcctttattgtac

This study

v-frdA

taccctgaagtacgtggctgaggtagttgcgtcataaggc

This study

v-pta

ccaaccaacgaagaactggttagcgcaaatattcccttgc

This study

v-adhE

cgagcagatgatttactaaaaaagatcggcattgcccagaagg

This study

v-lldD

cagtttcgatattctggaagcgacagattcatgctgcg

This study

v-ldhA

gcttaaatgtgattcaacatcactggagaatagaggatgaaaggtcattg

This study

c-ldh

gacggtaccatgactgcaactaaacaacacaaaaaaggtacggatccttagtttttgcaagcagaagcgaattc

This study

r1-ldh

tgctgtacatgactgcaactaaacaacactcgtgtacattagtttttgcaagcagaagc

This study

r2-ldh

cttacggtcaattgttgacgcgtcaacaattgaccgtaag

This study

  1. a Deletions were moved into each strain in the order they appear in the “description” column.
  2. b “v”, “c” and “r” indicate the primer sequences (5’ to 3’) that were used for verification purposes (“v”) during gene disruptions, cloning (“c”) of S. bovis ldh, and chromosomal replacement (“r”) of E. coli ldhA with S. bovis ldh (“r”). “r1” and “r2” were used to confirm the presence S. bovis ldh in the E. coli chromosome (“r1”) along wit its presence in the ldhA locus (“r2”). The forward sequence follows the reverse sequence in each case. Genes or operons manipulated are apparent from primer names.