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Sequence‐specific, Golgi‐dependent vacuolar targeting of castor bean 2S albumin

Sequence‐specific, Golgi‐dependent vacuolar targeting of castor bean 2S albumin The targeting of the castor bean (Ricinus communis) 2S albumin precursor has been investigated by expressing cDNA in transformed tobacco (Nicotiana tabacum) leaf cells and by following biosynthesis in the native tissue. Correct targeting in both tissues was accompanied by processing of the precursor. Delivery to vacuoles was sensitive to brefeldin A (BFA) treatment in both tissues and to perturbation of COPII function in tobacco, supporting the view that transport through the Golgi is required. The targeting signal for this Golgi‐dependent routing lies within the propeptide of the first heterodimer of proalbumin. This propeptide directed a normally secreted reporter protein to the vacuoles of tobacco cells in a Golgi‐dependent manner in vivo, unless a critical Leu residue was mutated, supporting the view that a sequence‐specific signal was needed to target a seed storage protein to the vacuoles of a vegetative cell. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The Plant Journal Wiley

Sequence‐specific, Golgi‐dependent vacuolar targeting of castor bean 2S albumin

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References (37)

Publisher
Wiley
Copyright
Copyright © 2003 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0960-7412
eISSN
1365-313X
DOI
10.1046/j.1365-313X.2003.01913.x
Publisher site
See Article on Publisher Site

Abstract

The targeting of the castor bean (Ricinus communis) 2S albumin precursor has been investigated by expressing cDNA in transformed tobacco (Nicotiana tabacum) leaf cells and by following biosynthesis in the native tissue. Correct targeting in both tissues was accompanied by processing of the precursor. Delivery to vacuoles was sensitive to brefeldin A (BFA) treatment in both tissues and to perturbation of COPII function in tobacco, supporting the view that transport through the Golgi is required. The targeting signal for this Golgi‐dependent routing lies within the propeptide of the first heterodimer of proalbumin. This propeptide directed a normally secreted reporter protein to the vacuoles of tobacco cells in a Golgi‐dependent manner in vivo, unless a critical Leu residue was mutated, supporting the view that a sequence‐specific signal was needed to target a seed storage protein to the vacuoles of a vegetative cell.

Journal

The Plant JournalWiley

Published: Dec 1, 2003

Keywords: ; ; ;

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