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Title: Single-colony MALDI mass spectrometry imaging reveals spatial differences in metabolite abundance between natural and cultured Trichodesmium morphotypes

Journal Article · · mSystems
ORCiD logo [1];  [2];  [2]; ORCiD logo [3];  [3];  [2]; ORCiD logo [4]
  1. Oregon State Univ., Corvallis, OR (United States)
  2. Hebrew Univ. of Jerusalem (Israel); The Interuniversity Institute for Marine Sciences, Eilat (Israel)
  3. Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
  4. Oregon State Univ., Corvallis, OR (United States); Univ. of Minnesota, Minneapolis, MN (United States)

Trichodesmium, a globally significant N2-fixing marine cyanobacterium, forms extensive surface blooms in nutrient-poor ocean regions. These blooms consist of a dynamic assemblage of Trichodesmium species that form distinct colony morphotypes and are inhabited by diverse microorganisms. Trichodesmium colony morphotypes vary in ecological niche, nutrient uptake, and organic molecule release, differentially impacting ocean carbon and nitrogen biogeochemical cycles. Here, we assessed the poorly studied spatial abundance of metabolites within and between three morphologically distinct Trichodesmium colonies collected from the Red Sea. We also compared these results with two morphotypes of the cultivable Trichodesmium strain IMS101. Using matrix-assisted laser desorption/ionization (MALDI) mass spectrometry imaging (MSI) coupled with liquid extraction surface analysis (LESA) tandem mass spectrometry (MS2), we identified and localized a wide range of small metabolites associated with single-colony Trichodesmium morphotypes. Our untargeted MALDI-MSI approach revealed 80 unique features (metabolites) shared between Trichodesmium morphotypes. Discrimination analysis showed spatial variations in 57 shared metabolites, accounting for 62% of the observed variation between morphotypes. The greatest variations in metabolite abundance were observed between the cultured morphotypes compared to the natural colony morphotypes, suggesting substantial differences in metabolite production between the cultivable strain IMS101 and the naturally occurring colony morphotypes that the cultivable strain is meant to represent. This study highlights the variations in metabolite abundance between natural and cultured Trichodesmium morphotypes and provides valuable insights into metabolites common to morphologically distinct Trichodesmium colonies, offering a foundation for future targeted metabolomic investigations.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
Simons Foundation; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); USDOE Office of Science (SC), Biological and Environmental Research (BER); United States-Israel Binational Science Foundation (BSF)
Grant/Contract Number:
AC02-05CH11231; AC05-76RL01830
OSTI ID:
2474715
Report Number(s):
PNNL-SA--204009
Journal Information:
mSystems, Journal Name: mSystems Journal Issue: 10 Vol. 9; ISSN 2379-5077
Publisher:
American Society for MicrobiologyCopyright Statement
Country of Publication:
United States
Language:
English

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