Novel cellulose-binding-domain protein in Phytophthora is cell wall localized

Cellulose binding domains (CBD) in the carbohydrate binding module family 1 (CBM1) are structurally conserved regions generally linked to catalytic regions of cellulolytic enzymes. While widespread amongst saprophytic fungi that subsist on plant cell wall polysaccharides, they are absent amongst most plant pathogenic fungal cellulases. A genome wide survey for CBM1 was performed on the highly destructive plant pathogen Phytophthora infestans, a fungal-like Stramenopile, to determine if it harbored cellulolytic enzymes with CBM1. Only five genes were found to encode CBM1, and none were associated with catalytic domains. Surveys of other genomes indicated that the CBM1-containing proteins, lacking other domains, represent a unique group of proteins largely confined to the Stramenopiles. Immunolocalization of one of these proteins, CBD1, indicated that it is embedded in the hyphal cell wall. Proteins with CBM1 domains can have plant host elicitor activity, but tests with Agrobacterium-mediated in planta expression and synthetic peptide infiltration failed to identify plant hypersensitive elicitation with CBD1. A structural basis for differential elicitor activity is proposed.

Title	Novel cellulose-binding-domain protein in Phytophthora is cell wall localized
Creator	Ospina-Giraldo, Manuel D.
Creator	Jones, R. W.
Publisher	PLoS ONE
Academic Department	Biology
Division	Natural Sciences
Organization	Lafayette College
Date Issued	August 24, 2011
Date Available	2011-11-23T15:10:22Z
Type	Article
Language	English
Bibliographic Citation	Jones, R. W. and M. D. Ospina-Giraldo. "Novel cellulose-binding-domain protein in Phytophthora is cell wall localized." PLoS ONE
Standard Identifier	DOI doi:10.1371/journal.pone.0023555.g002
Standard Identifier	Handle 10385/859
Permalink	http://hdl.handle.net/10385/859
Rights Statement	Creative Commons CC0 1.0 Universal Public Domain Dedication