Cloning and characterization of two osmotin isoforms from Piper colubrinum

Mani, Tomson; Manjula, S.

doi:10.1007/s10535-010-0068-1

Cited by 3 publications

References 19 publications

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Expression and Functional Analysis of Two Osmotin (PR5) Isoforms with Differential Antifungal Activity from Piper colubrinum: Prediction of Structure–Function Relationship by Bioinformatics Approach

2011

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Osmotin, a pathogenesis-related antifungal protein, is relevant in induced plant immunity and belongs to the thaumatin-like group of proteins (TLPs). This article describes comparative structural and functional analysis of the two osmotin isoforms cloned from Phytophthora-resistant wild Piper colubrinum. The two isoforms differ mainly by an internal deletion of 50 amino acid residues which separates them into two size categories (16.4 kDa-PcOSM1 and 21.5 kDa-PcOSM2) with pI values 5.6 and 8.3, respectively. Recombinant proteins were expressed in E. coli and antifungal activity assays of the purified proteins demonstrated significant inhibitory activity of the larger osmotin isoform (PcOSM2) on Phytophthora capsici and Fusarium oxysporum, and a markedly reduced antifungal potential of the smaller isoform (PcOSM1). Homology modelling of the proteins indicated structural alterations in their three-dimensional architecture. Tertiary structure of PcOSM2 conformed to the known structure of osmotin, with domain I comprising of 12 β-sheets, an α-helical domain II and a domain III composed of 2 β-sheets. PcOSM1 (smaller isoform) exhibited a distorted, indistinguishable domain III and loss of 4 β-sheets in domain I. Interestingly, an interdomain acidic cleft between domains I and II, containing an optimally placed endoglucanase catalytic pair composed of Glu-Asp residues, which is characteristic of antifungal PR5 proteins, was present in both isoforms. It is well accepted that the presence of an acidic cleft correlates with antifungal activity due to the presence of endoglucanase catalytic property, and hence the present observation of significantly reduced antifungal capacity of PcOSM1 despite the presence of a strong acidic cleft, is suggestive of the possible roles played by other structural features like domain I or/and III, in deciding the antifungal potential of osmotin.

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Expression and Functional Analysis of Two Osmotin (PR5) Isoforms with Differential Antifungal Activity from Piper colubrinum: Prediction of Structure–Function Relationship by Bioinformatics Approach

2011

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Transgenic Research in Spices

Babu

Jose

Suraby

et al. 2018

Genetic Engineering of Horticultural Crops

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Characterization of Three Osmotin-Like Proteins from Plumeria rubra and Prospection for Adiponectin Peptidomimetics

Freitas

Nishi

Nascimento

et al. 2020

PPL

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Background: Osmotin-Like Proteins (OLPs) have been purified and characterized from different plant tissues, including latex fluids. Besides its defensive role, tobacco osmotin seems to induce adiponectin-like physiological effects, acting as an agonist. However, molecular information about this agonistic effect on adiponectin receptors has been poorly exploited and other osmotins have not been investigated yet. Objective and Methods: The present study involved the characterization of three OLPs from Plumeria rubra latex and molecular docking studies to evaluate the interaction between them and adiponectin receptors (AdipoR1 and AdipoR2). Results: P. rubra Osmotin-Like Proteins (PrOLPs) exhibited molecular masses from 21 to 25 kDa and isoelectric points ranging from 4.4 to 7.7. The proteins have 16 cysteine residues, which are involved in eight disulfide bonds, conserved in the same positions as other plant OLPs. The three-dimensional (3D) models exhibited the three typical domains of OLPs, and molecular docking analysis showed that two PrOLP peptides interacted with two adiponectin receptors similarly to tobacco osmotin peptide. Conclusion: As observed for tobacco osmotin, the latex osmotins of P. rubra exhibited compatible interactions with adiponectin receptors. Therefore, these plant defense proteins (without known counterparts in humans) are potential tools to study modulation of glucose metabolism in type II diabetes, where adiponectin plays a pivotal role in homeostasis.

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Cloning and characterization of two osmotin isoforms from Piper colubrinum

Cited by 3 publications

References 19 publications

Expression and Functional Analysis of Two Osmotin (PR5) Isoforms with Differential Antifungal Activity from Piper colubrinum: Prediction of Structure–Function Relationship by Bioinformatics Approach

Expression and Functional Analysis of Two Osmotin (PR5) Isoforms with Differential Antifungal Activity from Piper colubrinum: Prediction of Structure–Function Relationship by Bioinformatics Approach

Transgenic Research in Spices

Characterization of Three Osmotin-Like Proteins from Plumeria rubra and Prospection for Adiponectin Peptidomimetics

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