The PLUTO plastidial nucleobase transporter also transports the thiamin precursor hydroxymethylpyrimidine.

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 Rep

journal_title

Bioscience reports

authors

Beaudoin GAW,Johnson TS,Hanson AD

doi

10.1042/BSR20180048

subject

Has Abstract

pub_date

2018-03-29 00:00:00

issue

2

eissn

0144-8463

issn

1573-4935

pii

BSR20180048

journal_volume

38

pub_type

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