PMID: 9426602Jan 14, 1998Paper

Molecular organization of a gene in barley which encodes a protein similar to aspartic protease and its specific expression in nucellar cells during degeneration

Plant Molecular Biology
F Chen, M R Foolad

Abstract

The nucellar cells of barley undergo progressive degeneration after ovule fertilization. This degeneration is a characteristic of programmed cell death. Increasing evidence has indicated that proteases are important regulators of programmed cell death in animals. We have cloned and characterized a barley gene which encodes an aspartic protease-like protein and is specifically expressed in nucellar cells during degeneration. The gene contains eight exons and seven introns and encodes a polypeptide of 410 amino acid residues. The deduced polypeptide is characterized by having two aspartic protease catalytic site motifs, the Asp-Thr-Gly-Ser in the N-terminal and Asp-Ser-Gly-Ser in the C-terminal region, and two other regions nearly identical to two regions of plant aspartic proteases. However, it shares < 20% overall sequence identity with the known plant aspartic proteases, and does not contain a 'prosequence' or a 'plant-specific insert' which are characteristics of plant aspartic proteases. We have named this aspartic protease-like protein 'nucellin'. In northern analyses nucellin transcripts were most abundant in ovaries 3-4 days after pollination, but only marginally detectable before pollination or 10 days after pollination....Continue Reading

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