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Table I Efficiency of transformation of deletions into TIGR4

From: The three extra-cellular zinc metalloproteinases of Streptococcus pneumoniae have a different impact on virulence in mice

Target gene

homology upstream*

homology downstream

size of inserted marker

size of deletion

trans-forming DNA (ng/ml)

trans-formants (CFU/ ml)

selected trans-formant

SP0071 – zmp C

757 (including 27 bp of zmp C)

807 (including 1 bp of zmp C)

1184 (cat)

5543

500

100

FP122

SP0664 – zmp B

715 (including 25 bp of zmpB)

838 (from 7 bp after zmp B)

894 (erm B)

5628

1500

10

FP173

SP1154 – iga

801 (including 11 bp of iga)

828 (including 27 bp of iga)

850 (spe)

6004

1500

120

FP174

  1. * all sizes are expressed in base pairs. The total number of transformants obtained transforming 1 μg/ml were 5.2 × 102 CFU/ml using a chromosomal DNA carrying a point mutation conferring novobiocin resistance (positive control).