Chlamydomonas agglutinin is a hydroxyproline-rich glycoprotein

Abstract
The mt+ sexual agglutinin from C. reinhardi contains .apprxeq. 12% hydroxyproline, and 2 inhibitors of hydroxyproline formation, .alpha.,.alpha.''-dipyridyl and 3,4-dehydroproline, block the production of agglutinin activity in an in vivo bioassay system. The agglutinin glycoprotein may be related to a class of hydroxyproline-rich glycoproteins found in the extracellular matrix of higher plants, several of which have lectin activity.