A 20 nucleotide upstream element is essential for the nopaline synthase (nos) promoter activity.

Abstract:

:The nopaline synthase (nos) promoter is expressed in a wide range of plant cell types and regulated by various developmental and environmental factors. The nos upstream control region essential for this regulation was studied by means of synthetic oligomers using transient and stable transformation systems. Insertion of a 20 nucleotide sequence containing two hexamer motifs and a spacer region into deletion mutants lacking the upstream control region was essential for promoter activity. Mutation of one or more nucleotides of either hexamer sequence significantly altered the strength of expression of the nos promoter. Point mutations within the spacer region also strongly influenced promoter strength. Insertion of multiple copies of the 20 nucleotide sequence into the nonfunctional deletion mutants proportionally increased the promoter activity. These results suggest that this twenty nucleotide sequence is essential for the nos promoter to function. Substitution of the nos element with the ocs or 35S as-1 which contain similar hexamer motifs restored not only promoter activity but also responses to wounding, auxin, methyl jasmonate, and salicylic acid.

journal_name

Plant Mol Biol

journal_title

Plant molecular biology

authors

Kim Y,Buckley K,Costa MA,An G

doi

10.1007/BF00040578

subject

Has Abstract

pub_date

1994-01-01 00:00:00

pages

105-17

issue

1

eissn

0167-4412

issn

1573-5028

journal_volume

24

pub_type

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