Open AccessThe actin‐regulating kinase homologue MoArk1 plays a pleiotropic function in M agnaporthe oryzae
Author(s) -
Wang Jiamei,
Du Yan,
Zhang Haifeng,
Zhou Chen,
Qi Zhongqiang,
Zheng Xiaobo,
Wang Ping,
Zhang Zhengguang
Publication year - 2013
Publication title -
molecular plant pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.945
H-Index - 103
eISSN - 1364-3703
pISSN - 1464-6722
DOI - 10.1111/mpp.12020
Subject(s) - biology , microbiology and biotechnology , endocytosis , appressorium , actin cytoskeleton , actin , magnaporthe , mutant , cytoskeleton , endocytic cycle , biochemistry , receptor , gene , cell , oryza sativa , magnaporthe grisea
Summary Endocytosis is an essential cellular process in eukaryotic cells that involves concordant functions of clathrin and adaptor proteins, various protein and lipid kinases, phosphatases and the actin cytoskeleton. In S accharomyces cerevisiae , Ark1p is a member of the serine/threonine protein kinase ( SPK ) family that affects profoundly the organization of the cortical actin cytoskeleton. To study the function of MoArk1 , an Ark1p homologue identified in M agnaporthe oryzae , we disrupted the MoARK1 gene and characterized the Δ Moark1 mutant strain. The Δ Moark1 mutant exhibited various defects ranging from mycelial growth and conidial formation to appressorium‐mediated host infection. The Δ Moark1 mutant also exhibited decreased appressorium turgor pressure and attenuated virulence on rice and barley. In addition, the Δ Moark1 mutant displayed defects in endocytosis and formation of the S pitzenkörper, and was hyposensitive to exogenous oxidative stress. Moreover, a MoArk1 ‐green fluorescent protein ( MoArk1 ‐ GFP ) fusion protein showed an actin‐like localization pattern by localizing to the apical regions of hyphae. This pattern of localization appeared to be regulated by the N ‐ethylmaleimide‐sensitive factor attachment protein receptor ( SNARE ) proteins MoSec22 and MoVam7 . Finally, detailed analysis revealed that the proline‐rich region within the MoArk1 serine/threonine kinase ( S _ TKc ) domain was critical for endocytosis, subcellular localization and pathogenicity. These results collectively suggest that MoArk1 exhibits conserved functions in endocytosis and actin cytoskeleton organization, which may underlie growth, cell wall integrity and virulence of the fungus.