NDLI: Cerato-platanin shows expansin-like activity on cellulosic materials

Content Provider	Springer Nature Link
Author	Baccelli, Ivan Luti, Simone Bernardi, Rodolfo Scala, Aniello Pazzagli, Luigia
Copyright Year	2013
Abstract	Cerato-platanin (CP) is a non-catalytic protein with a double ψβ-barrel fold located in the cell wall of the phytopathogenic fungus Ceratocystis platani. CP is released during growth and induces defence-related responses in plants. CP is also the first member of the “cerato-platanin family” (CPF) (Pfam PF07249). In the CPF, the molecular mechanism of action on plants and above all the biological role in fungal life are little-known aspects. However, an expansin-like function has recently been suggested concerning CP. Expansin-like proteins have the ability to act non-hydrolytically on cellulose. In the present work, the expansin-like activity of CP and Pop1, a CP family member, was investigated. Like expansins, CP and Pop1 were able to weaken filter paper in a concentration-dependent manner and without the production of reducing sugars. A metal-dependent polysaccharide monooxygenase-like activity was excluded. The optimum of activity was pH 5.0, 38 °C. CP was also able to cause fragmentation of the crystalline cellulose Avicel and the breakage and defibration of cotton fibres. However, the interaction did not involve a stable bond with the substrates and CP did not significantly enhance the hydrolytic activity of cellulase. On the other hand, CP and Pop1 bound quickly to chitin. We consider CP as a novel one-domain expansin-like protein. We propose a structural role for CP in the fungal cell wall due to the ability to bind chitin, and hypothesize a functional role in the interaction of the fungus with the plant for the weakening activity shown on cellulose.
Starting Page	175
Ending Page	184
Page Count	10
File Format	PDF
ISSN	01757598
Journal	Applied Microbiology and Biotechnology
Volume Number	98
Issue Number	1
e-ISSN	14320614
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-03-20
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	Non-hydrolytic activity Loosenin Swollenin Disruption activity Amorphogenesis PAMP Microbiology Microbial Genetics and Genomics Biotechnology
Content Type	Text
Resource Type	Article
Subject	Medicine Applied Microbiology and Biotechnology Biotechnology

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