Table 1

Chemotactic responses of classical V. cholerae strains: O395N1 carrying pAH901 (Che+), Vmlp24 carrying pAH901 (Δmlp24), and Vmlp24 carrying pMlp24 (Δmlp24/pMlp24)

Amino acidNo. of cells in the capillary with 10 mM amino acid (×105)a
Che+bΔmlp24cΔmlp24/ pMlp24d
Serine855 ± 174*479 ± 77*934 ± 68**
Glycine586 ± 74**239 ± 52**633 ± 113**
Alanine541 ± 42**221 ± 60**700 ± 16**
Cysteine522 ± 97*149 ± 22**605 ± 18**
Arginine504 ± 45**203 ± 41**184 ± 45
Asparagine427 ± 60**168 ± 29**638 ± 30**
Histidine370 ± 96*65 ± 19**333 ± 48**
Threonine344 ± 24**53 ± 6**459 ± 51**
Lysine328 ± 63*131 ± 11**394 ± 60**
Glutamine323 ± 40**103 ± 75*350 ± 89**
Proline322 ± 5**91 ± 17**557 ± 32**
Methionine288 ± 84*154 ± 48413 ± 47**
Valine253 ± 17**184 ± 67405 ± 71*
Phenylalanine154 ± 47*41 ± 5289 ± 11**
Glutamic acid137 ± 37**96 ± 33104 ± 59
Aspartic acid120 ± 35*214 ± 36135 ± 50
Leucine111 ± 23*112 ± 12347 ± 142
Tryptophan103 ± 19*74 ± 1060 ± 28
Isoleucine101 ± 22*81 ± 21295 ± 94*
Tyrosine68 ± 2238 ± 13213 ± 18**
None28 ± 222 ± 1416 ± 4
  • a Means ± standard deviations of triplicate data are shown.

  • b Values significantly higher than that of “none” at a P value of <0.05 (*) or <0.01 (**) in the t test are marked.

  • c For each amino acid, values were tested in comparison with those of “Che+” and are marked if they are significantly lower at a P value of <0.05 (*) or <0.01 (**) in the t test.

  • d For each amino acid, values were tested in comparison with those of “Δmlp24” and are marked if they are significantly higher at a P value of <0.05 (*) or <0.01 (**) in the t test.