This is a family of plant proteins designated COBRA-like (COBL) proteins. The 12 Arabidopsis members of the family are all GPI-linked [1]. Some members of this family are annotated as phytochelatin synthase, but these annotations are incorrect [3].

1: The COBRA family of putative GPI-anchored proteins in Arabidopsis. A new fellowship in expansion. Roudier F, Schindelman G, DeSalle R, Benfey PN; Plant Physiol. 2002;130:538-548. PMID:12376623

2: COBRA, an Arabidopsis extracellular glycosyl-phosphatidyl inositol-anchored protein, specifically controls highly anisotropic expansion through its involvement in cellulose microfibril orientation. Roudier F, Fernandez AG, Fujita M, Himmelspach R, Borner GH, Schindelman G, Song S, Baskin TI, Dupree P, Wasteneys GO, Benfey PN; Plant Cell. 2005;17:1749-1763. PMID:15849274

3: Weeds, worms, and more. Papain's long-lost cousin, phytochelatin synthase. Rea PA, Vatamaniuk OK, Rigden DJ; Plant Physiol. 2004;136:2463-2474. PMID:15375203