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CATEGORIES:College of Arts and Sciences
DESCRIPTION:Nitrogen availability regulates primary production and Earth's 
 climate, yet the metabolic architectures of microorganisms mediating biolo
 gical nitrogen fixation (BNF) and denitrification remain poorly understood
 . We mapped metabolic potential across cultured and uncultivated diazotrop
 hs and denitrifiers by analyzing ~12,000 high-quality genomes. Here we dem
 onstrate that nitrogen-cycling functions frequently extend beyond canonica
 l guild boundaries. Strikingly, 11% of the combined set of diazotrophs and
  denitrifiers encoded BNF, denitrification, and nitrogen retention within 
 a single genome. Further, 55% of diazotrophs and 51% of denitrifiers encod
 e dissimilatory nitrate reduction to ammonium, indicating widespread nitro
 gen retention capacity. Beyond nitrogen metabolism, 59% of diazotroph and 
 24% of denitrifiers encoded at least one carbon fixation pathway, revealin
 g widespread mixotrophic potential coupled to chemolithotrophic energy and
  organic-carbon metabolism. Carbon fixation strategies were phylogenetical
 ly partitioned and habitat-structured, with Wood-Ljungdahl pathway was 14-
 fold more abundant in diazotrophs than denitrifiers. In metabolic space, o
 rganisms capable of multiple nitrogen-cycling functions and mixotrophs occ
 upied an intermediate region between canonical guilds, shifting the view o
 f nitrogen-cycling organisms from taxonomy-defined guilds to pathway resol
 ved metabolic understandings. Additionally, we separated true and pseudo d
 iazotrophs (which carry only a fragment of the nitrogenase enzyme) and sho
 wed that the retained nitrogenase component have undergone neofunctionaliz
 ation, with predicted roles in tetrapyrrole biosynthesis, sulfur scavengin
 g and methanogenesis. These pathway-resolved genomic maps provide a framew
 ork for incorporating uncultivated nitrogen-cycling lineages and their met
 abolic plasticity into biogeochemical models of nitrogen and carbon flux u
 nder environmental change.\nEvent page: https://www.umassd.edu/events/cms/
 10-23-26-biology-seminar-by-subhadeep-chowdhury-start-date.php
X-ALT-DESC;FMTTYPE=text/html:<html><body><p>Nitrogen availability regulates
  primary production and Earth's climate\, yet the metabolic architectures 
 of microorganisms mediating biological nitrogen fixation (BNF) and denitri
 fication remain poorly understood. We mapped metabolic potential across cu
 ltured and uncultivated diazotrophs and denitrifiers by analyzing ~12\,000
  high-quality genomes. Here we demonstrate that nitrogen-cycling functions
  frequently extend beyond canonical guild boundaries. Strikingly\, 11% of 
 the combined set of diazotrophs and denitrifiers encoded BNF\, denitrifica
 tion\, and nitrogen retention within a single genome. Further\, 55% of dia
 zotrophs and 51% of denitrifiers encode dissimilatory nitrate reduction to
  ammonium\, indicating widespread nitrogen retention capacity. Beyond nitr
 ogen metabolism\, 59% of diazotroph and 24% of denitrifiers encoded at lea
 st one carbon fixation pathway\, revealing widespread mixotrophic potentia
 l coupled to chemolithotrophic energy and organic-carbon metabolism. Carbo
 n fixation strategies were phylogenetically partitioned and habitat-struct
 ured\, with Wood-Ljungdahl pathway was 14-fold more abundant in diazotroph
 s than denitrifiers. In metabolic space\, organisms capable of multiple ni
 trogen-cycling functions and mixotrophs occupied an intermediate region be
 tween canonical guilds\, shifting the view of nitrogen-cycling organisms f
 rom taxonomy-defined guilds to pathway resolved metabolic understandings. 
 Additionally\, we separated true and pseudo diazotrophs (which carry only 
 a fragment of the nitrogenase enzyme) and showed that the retained nitroge
 nase component have undergone neofunctionalization\, with predicted roles 
 in tetrapyrrole biosynthesis\, sulfur scavenging and methanogenesis. These
  pathway-resolved genomic maps provide a framework for incorporating uncul
 tivated nitrogen-cycling lineages and their metabolic plasticity into biog
 eochemical models of nitrogen and carbon flux under environmental change.<
 /p><p>Event page: <a href="https://www.umassd.edu/events/cms/10-23-26-biol
 ogy-seminar-by-subhadeep-chowdhury-start-date.php">https://www.umassd.edu/
 events/cms/10-23-26-biology-seminar-by-subhadeep-chowdhury-start-date.php<
 /a></a></p></body></html>
DTSTAMP:20261013T222306
DTSTART;TZID=America/New_York:20261023T120000
DTEND;TZID=America/New_York:20261023T125000
LOCATION:SENG 113
SUMMARY;LANGUAGE=en-us:Biology Seminar by Subhadeep Chowdhury Start date	
UID:a6b84b13ea4dd3602d8c7f2ee69815ab@www.umassd.edu
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