Genomic organization and promoter activity of the maize starch branching enzyme I gene

Kyung Nam Kim, Dane K. Fisher, Ming Gao, Mark Guiltinan

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Starch branching enzymes (SBE) which catalyse the formation of α-1,6-glucan linkages are of crucial importance for the quantity and quality of starch synthesized in plants. In maize (Zea mays L.), three SBE isoforms (SBEI, IIa and IIb) have been identified and shown to exhibit differential expression patterns. As a first step toward understanding the regulatory mechanisms controlling their expression, we isolated and sequenced a maize genomic DNA (-2190 to +5929) which contains the entire coding region of SBEI (Sbe1) as well as 5'-and 3'-flanking sequences. Using this clone, we established a complete genomic organization of the maize Sbe1 gene. The transcribed region consists of 14 exons and 13 introns, distributed over 5.7 kb. A consensus TATA-box and a G-box containing a perfect palindromic sequence, CCACGTGG, were found in the 5'-flanking region. Genomic Southern blot analysis indicated that two Sbe1 genes with divergent 5'-flanking sequences exist in the maize genome, suggesting the possibility that they are differentially regulated. A chimeric construct containing the 5'-flanking region of Sbe1 (-2190 to +27) fused to the β-glucuronidase gene (pKG101) showed promoter activity after it was introduced into maize endosperm suspension cells by particle bombardment.

Original languageEnglish (US)
Pages (from-to)233-243
Number of pages11
JournalGene
Volume216
Issue number2
DOIs
StatePublished - Aug 31 1998

Fingerprint

1,4-alpha-Glucan Branching Enzyme
Zea mays
5' Flanking Region
Genes
3' Flanking Region
Endosperm
TATA Box
Glucans
Glucuronidase
Southern Blotting
Starch
Introns
Exons
Suspensions
Protein Isoforms
Clone Cells
Genome
DNA

All Science Journal Classification (ASJC) codes

  • Genetics

Cite this

Kim, Kyung Nam ; Fisher, Dane K. ; Gao, Ming ; Guiltinan, Mark. / Genomic organization and promoter activity of the maize starch branching enzyme I gene. In: Gene. 1998 ; Vol. 216, No. 2. pp. 233-243.
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Genomic organization and promoter activity of the maize starch branching enzyme I gene. / Kim, Kyung Nam; Fisher, Dane K.; Gao, Ming; Guiltinan, Mark.

In: Gene, Vol. 216, No. 2, 31.08.1998, p. 233-243.

Research output: Contribution to journalArticle

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