InterPro domain: IPR003882

Extensins are plant cell-wall proteins; they can account for up to 20% ofthe dry weight of the cell wall. They are highly-glycosylated, possiblyreflecting their interactions with cell-wall carbohydrates. Amongst their functions is cell wall strengthening in response to mechanical stress (e.g.,during attack by pests, plant-bending in the wind, etc.).By contrast with extensin genes, pistil-specific extensin-like genes arenot induced under stress conditions. Gene expression is organ-specific and temporally regulated during pistil development. After pollination, transcript levels of pistil-specific extensin-like genes change relative tolevels in unpollinated pistils [ 1 ]. The protein sequence is characterisedby multiple tandem ser-pro-pro-pro-pro pentapeptide repeats.

1. Developmental expression of tobacco pistil-specific genes encoding novel extensin-like proteins. Plant Cell 4, 1041-51