Cytoplasmic Transport Machinery of the SPF27 Homologue Num1 in Ustilago maydis

In the phytopathogenic basidiomycete Ustilago maydis , the Num1 protein has a pivotal function in hyphal morphogenesis. Num1 functions as a core component of the spliceosome-associated Prp19/CDC5 complex (NTC). The interaction of Num1 with the kinesin motor Kin1 suggests a connection between a compo...

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Bibliographic Details
Published in:Scientific reports 2018-02, Vol.8 (1), p.3611-12, Article 3611
Main Authors: Zhou, Lu, Obhof, Theresa, Schneider, Karina, Feldbrügge, Michael, Nienhaus, G. Ulrich, Kämper, Jörg
Format: Article
Language:English
Subjects:
14/35
631/1647/245/2226
631/326/193/2538
631/57/343/2281
Cytoplasm
Cytosol
Humanities and Social Sciences
Kinesin
Light microscopy
Localization
Microscopy
Microtubules
Morphogenesis
multidisciplinary
Nuclei
Num1 protein
Proteins
Science
Science (multidisciplinary)
Spatial discrimination
Splicing
Ustilago maydis
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Summary:In the phytopathogenic basidiomycete Ustilago maydis , the Num1 protein has a pivotal function in hyphal morphogenesis. Num1 functions as a core component of the spliceosome-associated Prp19/CDC5 complex (NTC). The interaction of Num1 with the kinesin motor Kin1 suggests a connection between a component of the splicing machinery and cytoplasmic trafficking processes. Previously it was shown that Num1 localizes predominantly in the nucleus; however, due to the diffraction-limited spatial resolution of conventional optical microscopy, it was not possible to attribute the localization to specific structures within the cytoplasm. We have now employed super-resolution localization microscopy to visualize Num1 in the cytoplasm by fusing it to a tandem dimeric Eos fluorescent protein (tdEosFP). The Num1 protein is localized within the cytoplasm with an enhanced density in the vicinity of microtubules. Num1 movement is found predominantly close to the nucleus. Movement is dependent on its interaction partner Kin1, but independent of Kin3. Our results provide strong evidence that, in addition to its involvement in splicing in the nucleus, Num1 has an additional functional role in the cytosol connected to the Kin1 motor protein.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-018-21628-y