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Table 1 The characteristics and the putative structures of the putative serrawettin W2 analogues

From: Analysis of the genomic sequences and metabolites of Serratia surfactantfaciens sp. nov. YD25T that simultaneously produces prodigiosin and serrawettin W2

Compound [M + H]+ (m/z) [M + Na]+ (m/z) [M + K]+ (m/z) MWb (m/z) MS fragment
(ESI-MS/MS)
Structure predicatingc
sw-1 704.3 726.5 742.4 703.3 613.3,595.3a,551.4,533.3a,466.3,448.3a, C10OH-Abu/Aib-Ser-Thr-Phe-Ile/Leu
      365.2, 347.3a  
sw-2 718.3 740.6 756.5 717.3 641.3,627.4a,565.3,547.3a,494.3,480.3a, C10OH-Val-Ser-Thr-Phe-Ile/Leu
      448.3, 379.3, 361.2a  
sw-3 732.2 754.6 770.4 731.2 641.4,623.5a,579.8,551.4a,494.3,476.3a, C10OH-Leu/Ile-Ser-Thr-Phe-Ile/Leu
      448.4, 393.3, 375.1a  
sw-4 732.3 754.6 770.6 731.3 641.3,623.4a,579.3,551.1a,494.3,476.3a, C10OH-Leu/Ile-Ser-Thr-Phe-Ile/Leu
      448.3, 393.1, 375.2a  
sw-6 746.4 768.6 784.5 745.4 655.4,637.2a,593.4,575.2a,508.3,490.3a, C10OH-Leu/Ile-Thr-Thr-Phe-Ile/Leu
      462.3, 407.2, 389.1a  
sw-7 758.2 780.5 796.5 757.2 667.4, 649.5a, 605.7, 587.4a, 520.2, C10OH-Leu/Ile-Leu/Ile-Thr-Phe-Ile/Leu
      502.3a, 474.3, 419.2, 402.1a  
sw-8 760.3 782.5 798.3 759.3 669.3, 651.2a, 625.5, 607.4a, 522.3, C10OH-Leu/Ile-Asp-Thr-Phe-Ile/Leu
      504.5a, 476.5, 421.3, 403.3a  
  1. aThese peaks were formed as an ester bond was cleaved following double hydrogen transfer (DHT) mechanism. bThe molecular weight (MW) was based on the peaks of [M + H]+, [M + Na]+ and [M + K]+. cMass spectrometry couldn’t distinguish between isomers like leucine and isoleucine