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  • Title: The Egg apparatus 1 gene from maize is a member of a large gene family found in both monocots and dicots.
    Author: Gray-Mitsumune M, Matton DP.
    Journal: Planta; 2006 Feb; 223(3):618-25. PubMed ID: 16341706.
    Abstract:
    The maize ZmEA1 protein was recently postulated to be involved in short-range pollen tube guidance from the embryo sac. To date, EA1-like sequences had only been identified in monocot species. Using a more conserved C-terminal motif found in the monocot species, numerous ZmEA1-like sequences were retrieved in EST databases from dicot species, as well as from unannotated genomic sequences of Arabidopsis thaliana. RT-PCR analyses were produced for these unannotated genes and showed that these were indeed expressed genes. Further structural and phylogenetic analyses revealed that all members of the EA1-like (EAL) gene family shared a conserved 27-29 amino acid motif, termed the EA box near the C-terminal end, and appear to be secretory proteins. Therefore, the EA box proteins defines a new class of small secretory proteins, some of which being possibly involved in pollen tube guidance.
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