Thiamine metabolism genes in diatoms are not regulated by thiamine despite the presence of predicted riboswitches

© 2022 The Authors. New Phytologist © 2022 New Phytologist Foundation.

Bibliographische Detailangaben
Veröffentlicht in:The New phytologist. - 1979. - 235(2022), 5 vom: 14. Sept., Seite 1853-1867
1. Verfasser: Llavero-Pasquina, Marcel (VerfasserIn)
Weitere Verfasser: Geisler, Katrin, Holzer, Andre, Mehrshahi, Payam, Mendoza-Ochoa, Gonzalo I, Newsad, Shelby A, Davey, Matthew P, Smith, Alison G
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2022
Zugriff auf das übergeordnete Werk:The New phytologist
Schlagworte:Journal Article Research Support, Non-U.S. Gov't Phaeodactylum tricornutum CRISPR/Cas9 TPP riboswitch aptamer prediction diatoms thiamine biosynthesis thiamine uptake Riboswitch mehr... Thiamine Pyrophosphate Q57971654Y Thiamine X66NSO3N35
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245 1 0 |a Thiamine metabolism genes in diatoms are not regulated by thiamine despite the presence of predicted riboswitches 
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520 |a Thiamine pyrophosphate (TPP), an essential co-factor for all species, is biosynthesised through a metabolically expensive pathway regulated by TPP riboswitches in bacteria, fungi, plants and green algae. Diatoms are microalgae responsible for c. 20% of global primary production. They have been predicted to contain TPP aptamers in the 3'UTR of some thiamine metabolism-related genes, but little information is known about their function and regulation. We used bioinformatics, antimetabolite growth assays, RT-qPCR, targeted mutagenesis and reporter constructs to test whether the predicted TPP riboswitches respond to thiamine supplementation in diatoms. Gene editing was used to investigate the functions of the genes with associated TPP riboswitches in Phaeodactylum tricornutum. We found that thiamine-related genes with putative TPP aptamers are not responsive to supplementation with thiamine or its precursor 4-amino-5-hydroxymethyl-2-methylpyrimidine (HMP), and targeted mutation of the TPP aptamer in the THIC gene encoding HMP-P synthase does not deregulate thiamine biosynthesis in P. tricornutum. Through genome editing we established that PtTHIC is essential for thiamine biosynthesis and another gene, PtSSSP, is necessary for thiamine uptake. Our results highlight the importance of experimentally testing bioinformatic aptamer predictions and provide new insights into the thiamine metabolism shaping the structure of marine microbial communities with global biogeochemical importance 
650 4 |a Journal Article 
650 4 |a Research Support, Non-U.S. Gov't 
650 4 |a Phaeodactylum tricornutum 
650 4 |a CRISPR/Cas9 
650 4 |a TPP riboswitch 
650 4 |a aptamer prediction 
650 4 |a diatoms 
650 4 |a thiamine biosynthesis 
650 4 |a thiamine uptake 
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650 7 |a Thiamine Pyrophosphate  |2 NLM 
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650 7 |a Thiamine  |2 NLM 
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700 1 |a Geisler, Katrin  |e verfasserin  |4 aut 
700 1 |a Holzer, Andre  |e verfasserin  |4 aut 
700 1 |a Mehrshahi, Payam  |e verfasserin  |4 aut 
700 1 |a Mendoza-Ochoa, Gonzalo I  |e verfasserin  |4 aut 
700 1 |a Newsad, Shelby A  |e verfasserin  |4 aut 
700 1 |a Davey, Matthew P  |e verfasserin  |4 aut 
700 1 |a Smith, Alison G  |e verfasserin  |4 aut 
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