Abstract:
:In plants, the hydroxymethylpyrimidine (HMP) and thiazole precursors of thiamin are synthesized and coupled together to form thiamin in plastids. Mutants unable to form HMP can be rescued by exogenous HMP, implying the presence of HMP transporters in the plasma membrane and plastids. Analysis of bacterial genomes revealed a transporter gene that is chromosomally clustered with thiamin biosynthesis and salvage genes. Its closest Arabidopsis homolog, the plastidic nucleobase transporter (PLUTO), is co-expressed with several thiamin biosynthetic enzymes. Heterologous expression of PLUTO in Escherichia coli or Saccharomyces cerevisiae increased sensitivity to a toxic HMP analog, and disrupting PLUTO in an HMP-requiring Arabidopsis line reduced root growth at low HMP concentrations. These data implicate PLUTO in plastidial transport and salvage of HMP.
journal_name
Biosci Repjournal_title
Bioscience reportsauthors
Beaudoin GAW,Johnson TS,Hanson ADdoi
10.1042/BSR20180048subject
Has Abstractpub_date
2018-03-29 00:00:00issue
2eissn
0144-8463issn
1573-4935pii
BSR20180048journal_volume
38pub_type
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journal_title:Bioscience reports
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