Cytoplasmic Transport Machinery of the SPF27 Homologue Num1 in Ustilago maydis.

Abstract:

: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.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Zhou L,Obhof T,Schneider K,Feldbrügge M,Nienhaus GU,Kämper J

doi

10.1038/s41598-018-21628-y

subject

Has Abstract

pub_date

2018-02-26 00:00:00

pages

3611

issue

1

issn

2045-2322

pii

10.1038/s41598-018-21628-y

journal_volume

8

pub_type

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