NDLI: The pds2 mutation is a lesion in the Arabidopsis homogentisate solanesyltransferase gene involved in plastoquinone biosynthesis

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The pds2 mutation is a lesion in the Arabidopsis homogentisate solanesyltransferase gene involved in plastoquinone biosynthesis

Planta : Volume 226, Issue 3, August 2007

Planta : Volume 226, Issue 2, July 2007

Planta : Volume 226, Issue 1, June 2007

The pds2 mutation is a lesion in the Arabidopsis homogentisate solanesyltransferase gene involved in plastoquinone biosynthesis

Content Provider	Springer Nature Link
Author	Tian, Li DellaPenna, Dean Dixon, Richard A.
Copyright Year	2007
Abstract	Plastoquinone plays critical roles in photosynthesis, chlororespiration and carotenoid biosynthesis. The previously isolated pds2 mutant from Arabidopsis was deficient in tocopherol and plastoquinone accumulation, and the biochemical phenotype of this mutant could not be reversed by externally applied homogentisate, suggesting a later step in tocopherol and/or plastoquinone biosynthesis had been disrupted. Recently, the protein encoded by At3g11950 (AtHST) was shown to condense homogentisate with solanesyl diphosphate (SDP), the substrate for plastoquinone synthesis, but not phytyl diphosphate (PDP), the substrate for tocopherol biosynthesis. We have sequenced the AtHST allele in the pds2 mutant background and identified an in-frame 6 bp (2 aa) deletion in the gene. The pds2 mutation could be functionally complemented by constitutive expression of AtHST, demonstrating that the molecular basis for the pds2 mutation is this 6 bp-lesion in the AtHST gene. Confocal microscopy of EGFP tagged AtHST suggested that AtHST is localized to the chloroplast envelope, supporting the hypothesis that plastoquinone synthesis occurs in the plastid.
Starting Page	1067
Ending Page	1073
Page Count	7
File Format	PDF
ISSN	00320935
Journal	Planta
Volume Number	226
Issue Number	4
e-ISSN	14322048
Language	English
Publisher	Springer-Verlag
Publisher Date	2007-06-14
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Homogentisate pds2 Plastoquinone Prenyltransferase Solanesyl diphosphate Forestry Ecology Agriculture Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Genetics Plant Science

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