Plant Molecular Biology

, Volume 68, Issue 4–5, pp 493–503 | Cite as

Towards engineering increased pantothenate (vitamin B5) levels in plants

  • Ereck Chakauya
  • Katy M. Coxon
  • Ma Wei
  • Mary V. MacDonald
  • Tina Barsby
  • Chris Abell
  • Alison G. Smith
Article

Abstract

Pantothenate (vitamin B5) is the precursor of the 4′-phosphopantetheine moiety of coenzyme A and acyl-carrier protein. It is made by plants and microorganisms de novo, but is a dietary requirement for animals. The pantothenate biosynthetic pathway is well-established in bacteria, comprising four enzymic reactions catalysed by ketopantoate hydroxymethyltransferase (KPHMT), l-aspartate-α-decarboxylase (ADC), pantothenate synthetase (PS) and ketopantoate reductase (KPR) encoded by panB, panD, panC and panE genes, respectively. In higher plants, the genes encoding the first (KPHMT) and last (PS) enzymes have been identified and characterised in several plant species. Commercially, pantothenate is chemically synthesised and used in vitamin supplements, feed additives and cosmetics. Biotransformation is an attractive alternative production system that would circumvent the expensive procedures of separating racemic intermediates. We explored the possibility of manipulating pantothenate biosynthesis in plants. Transgenic oilseed rape (Brassica napus) lines were generated in which the E. coli KPHMT and PS genes were expressed under a strong constitutive CaMV35SS promoter. No significant change of pantothenate levels in PS transgenic lines was observed. In contrast plants expressing KPHMT had elevated pantothenate levels in leaves, flowers siliques and seed in the range of 1.5–2.5 fold increase compared to the wild type plant. Seeds contained the highest vitamin content, indicating that they might be the ideal target for production purposes.

Keywords

Pantothenate Genetic engineering E. coli pan genes Transgenic oilseed rape 

Abbreviations

α-KIVA

α-Ketoisovalerate

AMP

Adenosine monophosphate

ADC

l-Aspartate-α-decarboxylase

GUS

β-Glucuronidase

KPHMT

Ketopantoate hydroxymethyltransferase

KPR

Ketopantoate reductase

MUG

4-Methylumbelliferyl-beta-galactoside

PS

Pantothenate synthetase

Notes

Acknowledgements

We are grateful for funding from the UK Biotechnology and Biological Sciences Research Council (BBSRC) and EU FPV (HPRN-CT-2002-00244). E.C. was in receipt of a studentship from the Cambridge Commonwealth Trust through Sidney Sussex College.

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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  • Ereck Chakauya
    • 1
    • 2
  • Katy M. Coxon
    • 1
  • Ma Wei
    • 3
  • Mary V. MacDonald
    • 4
  • Tina Barsby
    • 4
  • Chris Abell
    • 5
  • Alison G. Smith
    • 1
  1. 1.Department of Plant SciencesUniversity of CambridgeCambridgeUK
  2. 2.CSIR BiosciencesPretoriaSouth Africa
  3. 3.Shanghai Jiao Tong UniversityShanghaiChina
  4. 4.Biogemma Ltd.Cambridge Science ParkCambridgeUK
  5. 5.University Chemical LaboratoryCambridgeUK

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