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Biochem Biophys Res Commun. 2012 Jan 27;417(4):1248-53. doi: 10.1016/j.bbrc.2011.12.118. Epub 2012 Jan 3.

Functional characterization of the pleckstrin homology domain of a cellulose synthase from the oomycete Saprolegnia monoica.

Author information

1
Division of Glycoscience, School of Biotechnology, Royal Institute of Technology (KTH), AlbaNova University Centre, 106 91 Stockholm, Sweden.

Abstract

Some oomycetes, for instance Saprolegnia parasitica, are severe fish pathogens that cause important economic losses worldwide. Cellulose biosynthesis is a vital process for this class of microorganisms, but the corresponding molecular mechanisms are poorly understood. Of all cellulose synthesizing enzymes known, only some oomycete cellulose synthases contain a pleckstrin homology (PH) domain. Some human PH domains bind specifically to phosphoinositides, but most PH domains bind phospholipids in a non-specific manner. In addition, some PH domains interact with various proteins. Here we have investigated the function of the PH domain of cellulose synthase 2 from the oomycete Saprolegnia monoica (SmCesA2), a species closely related to S. parasitica. The SmCesA2 PH domain is similar to the C-terminal PH domain of the human protein TAPP1. It binds in vitro to phosphoinositides, F-actin and microtubules, and co-localizes with F-actin in vivo. Our results suggest a role of the SmCesA2 PH domain in the regulation, trafficking and/or targeting of the cell wall synthesizing enzyme.

PMID:
22226909
DOI:
10.1016/j.bbrc.2011.12.118
[Indexed for MEDLINE]

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