Cloning and expression of pathogenesis-related protein 4 from jelly fig (Ficus awkeotsang Makino) achenes associated with ribonuclease, chitinase and anti-fungal activities

Plant Physiology and Biochemistry : PPB
Hsi-Chi LuWing-Ming Chou

Abstract

A cDNA fragment (FaPR4) encoding a class I pathogenesis-related protein 4 (PR-4) from Ficus awkeotsang was obtained by PCR cloning. Plant PR-4s were grouped into class I and II, differing by the presence of ChtBD and hinge. The predicted mature FaPR4 comprises N-terminal chitin-binding domain (ChtBD), hinge, Barwin domain and C-terminal extension. FaPR4-C, an N-terminal truncated form of FaPR4, was designed to mimic the structural feature of class II PR-4s. FaPR4 and FaPR4-C were over-expressed in yeast Pichia pastoris, and both recombinants exhibited RNase and anti-fungal activities. To our knowledge, it is the first report that FaPR4, a member of class I PR-4s has RNase activity as class II. FaPR4 possesses better anti-fungal activities toward Fusarium oxysporum and Sclerotium rolfsii than FaPR4-C. Heat-treated FaPR4 remained RNase and anti-fungal activities; while heat-treated FaPR4-C lost those activities. Therefore, ChtBD of FaPR4 may not only contribute to its anti-fungal but also improve the thermal stability of protein. It also implied the correlation of RNase activity with anti-fungal activity of FaPR4-C. Furthermore, FaPR4 was detected to have weak but significant chitinase activity, and its chitinase activity was red...Continue Reading

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Citations

Jun 25, 2013·Biotechnology Letters·Jean CletusNatarajan Sakthivel
Feb 14, 2015·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Sofie Van Holle, Els J M Van Damme
Oct 9, 2013·Acta Crystallographica. Section D, Biological Crystallography·Joëlle HuetAlexandre Wohlkönig
Mar 27, 2018·Plant Science : an International Journal of Experimental Plant Biology·Jingjing ChenZhongyun Piao

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