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Clathrin localization and dynamics in Aspergillus nidulans
Author(s) -
Schultzhaus Z.,
Johnson T. B.,
Shaw B. D.
Publication year - 2017
Publication title -
molecular microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.857
H-Index - 247
eISSN - 1365-2958
pISSN - 0950-382X
DOI - 10.1111/mmi.13557
Subject(s) - biology , clathrin , endocytosis , microbiology and biotechnology , golgi apparatus , endocytic cycle , endosome , aspergillus nidulans , exocytosis , internalization , brefeldin a , secretion , intracellular , cell , endoplasmic reticulum , biochemistry , gene , mutant
Summary Cell growth necessitates extensive membrane remodeling events including vesicle fusion or fission, processes that are regulated by coat proteins. The hyphal cells of filamentous fungi concentrate both exocytosis and endocytosis at the apex. This investigation focuses on clathrin in Aspergillus nidulans , with the aim of understanding its role in membrane remodeling in growing hyphae. We examined clathrin heavy chain (ClaH‐GFP) which localized to three distinct subcellular structures: late Golgi ( trans ‐Golgi equivalents of filamentous fungi), which are concentrated just behind the hyphal tip but are intermittently present throughout all hyphal cells; the region of concentrated endocytosis just behind the hyphal apex (the “endocytic collar”); and small, rapidly moving puncta that were seen trafficking long distances in nearly all hyphal compartments. ClaH localized to distinct domains on late Golgi, and these clathrin “hubs” dispersed in synchrony after the late Golgi marker PH OSBP . Although clathrin was essential for growth, ClaH did not colocalize well with the endocytic patch marker fimbrin. Tests of FM4‐64 internalization and repression of ClaH corroborated the observation that clathrin does not play an important role in endocytosis in A. nidulans . A minor portion of ClaH puncta exhibited bidirectional movement, likely along microtubules, but were generally distinct from early endosomes.