Exoenzyme-producing halophilic bacteria from the former Lake Texcoco: identification and production of n-butyl oleate and bioactive peptides

Folia Microbiol (Praha). 2020 Oct;65(5):835-847. doi: 10.1007/s12223-020-00794-5. Epub 2020 May 15.

Abstract

Halophilic bacterias from saline soil from former Lake Texcoco were isolated, identified based on 16 rRNA and tested to produce glucolytic, nucleolytic, proteolytic and lipolytic exoenzymes. The Bacillus, Virgibacillus, Kocuria, Salinicoccus, Gracilibacillus, Halobacillus, Tenuibacillus and Nesterekonia genera where identified. Lipase/eserases and proteases from Nesterenkonia sp. and Nesterenkonia aethiopica showed halotolerant characteristics and were selected to synthesize the oleochemical n-butyl oleate and antioxidant peptides from muscle protein of common carp (Cyprinus carpio), respectively. In organic media (2,2,4-Trimethylpentane), the lipase/esterases from Nesterenkonia sp. (0.6 U/mL) and N. aethiopica (1.2 U/mL) achieved a 62.7% and 53.2% of n-butyl oleate conversion, respectively. The protein hydrolysis from muscle of common carp (C. carpio) showed a degree of hydrolysis of 4.5 ± 0.2% and 2.8 ± 0.1% when proteases from Nesterenkonia sp. and N. aethiopica were used, respectively. Three peptidic fractions ranging molecular masses between 254 and 1002 Da [M + H] show antioxidant scavenging activity, and the principal fraction with a peptide of 547.3 Da [M + H] showed an inhibition of 37.7 ± 1.8% and 16.3 ± 0.6%, when 2,2-diphenyl-1-picrylhydrazyl and 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) were used, respectively. These findings showed that the enzymatic battery of the halophilic bacteria from former lake Texcoco can be used in hydrolysis and synthesis of molecules with applications in different fields as food technology or bioenergy.

MeSH terms

  • Animals
  • Antioxidants / chemistry
  • Antioxidants / metabolism*
  • Bacteria / classification*
  • Bacteria / genetics
  • Bacteria / isolation & purification
  • Bacteria / metabolism*
  • Bacterial Proteins / metabolism
  • Carps / metabolism
  • Esterases / metabolism
  • Hydrolysis
  • Lakes
  • Lipase / metabolism
  • Oleic Acids / metabolism*
  • Peptide Hydrolases / metabolism
  • Peptides / chemistry
  • Peptides / metabolism
  • Phylogeny
  • RNA, Ribosomal, 16S / genetics
  • Salt Tolerance*
  • Soil Microbiology

Substances

  • Antioxidants
  • Bacterial Proteins
  • Oleic Acids
  • Peptides
  • RNA, Ribosomal, 16S
  • 1-butyl oleate
  • Esterases
  • Lipase
  • Peptide Hydrolases