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  • Title: Pex1, a pollen-specific gene with an extensin-like domain.
    Author: Rubinstein AL, Broadwater AH, Lowrey KB, Bedinger PA.
    Journal: Proc Natl Acad Sci U S A; 1995 Apr 11; 92(8):3086-90. PubMed ID: 7724520.
    Abstract:
    We report here the identification of a pollen-specific gene from Zea mays that contains multiple Ser-(Pro)n repeats, the motif found in the cell wall-associated extensins. Sequence analysis reveals that the encoded protein has a putative globular domain at the N terminus and an extensin-like domain at the C terminus. The Pex1 (pollen extensin-like) gene is expressed exclusively in pollen, not in vegetative or female tissues, and is not induced in leaves upon wounding. We propose that the encoded protein may have a role in reproduction, either as a structural element deposited in the pollen tube wall during its rapid growth or as a sexual recognition molecule that interacts with partner molecules in the pistil.
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