RGD Reference Report - Myosin VI in the nucleus of neurosecretory PC12 cells: Stimulation-dependent nuclear translocation and interaction with nuclear proteins. - Rat Genome Database

RGD Reference Report - Myosin VI in the nucleus of neurosecretory PC12 cells: Stimulation-dependent nuclear translocation and interaction with nuclear proteins. - Rat Genome Database

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General

Myosin VI in the nucleus of neurosecretory PC12 cells: Stimulation-dependent nuclear translocation and interaction with nuclear proteins.
Authors:	Majewski, Lukasz Nowak, Jolanta Sobczak, Magdalena Karatsai, Olena Havrylov, Serhiy Lenartowski, Robert Suszek, Malgorzata Lenartowska, Marta Redowicz, Maria Jolanta
Citation:	Majewski L, etal., Nucleus. 2018 Jan 1;9(1):125-141. doi: 10.1080/19491034.2017.1421881.
RGD ID:	150521645
Pubmed:	PMID:29293066 (View Abstract at PubMed)
PMCID:	PMC5973263 (View Article at PubMed Central)
DOI:	DOI:10.1080/19491034.2017.1421881 (Journal Full-text)
Myosin VI (MVI) is a unique actin-based motor protein moving towards the minus end of actin filaments, in the opposite direction than other known myosins. Besides well described functions of MVI in endocytosis and maintenance of Golgi apparatus, there are few reports showing its involvement in transcription. We previously demonstrated that in neurosecretory PC12 cells MVI was present in the cytoplasm and nucleus, and its depletion caused substantial inhibition of cell migration and proliferation. Here, we show an increase in nuclear localization of MVI upon cell stimulation, and identification of potential nuclear localization (NLS) and nuclear export (NES) signals within MVI heavy chain. These signals seem to be functional as the MVI nuclear presence was affected by the inhibitors of nuclear import (ivermectin) and export (leptomycin B). In nuclei of stimulated cells, MVI colocalized with active RNA polymerase II, BrUTP-containing transcription sites and transcription factor SP1 as well as SC35 and PML proteins, markers of nuclear speckles and PML bodies, respectively. Mass spectrometry analysis of samples of a GST-pull-down assay with the MVI tail domain as a "bait" identified several new potential MVI binding partners. Among them are proteins involved in transcription and post-transcriptional processes. We confirmed interaction of MVI with heterogeneous nuclear ribonucleoprotein U (hnRNPU) and nucleolin, proteins involved in pre-mRNA binding and transport, and nucleolar function, respectively. Our data provide an insight into mechanisms of involvement of MVI in nuclear processes via interaction with nuclear proteins and support a notion for important role(s) for MVI in gene expression.

Gene Ontology Annotations Click to see Annotation Detail View

Molecular Function

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Term	Qualifier	Evidence	With	Reference	Notes	Source	Original Reference(s)
protein binding	enables	IPI	UniProtKB:D4A5I9	150521645	PMID:29293066	IntAct
protein binding	enables	IPI	UniProtKB:Q6IMY8	150521645	PMID:29293066	IntAct

Objects Annotated

Genes (Rattus norvegicus)

Hnrnpu (heterogeneous nuclear ribonucleoprotein U)

Myo6 (myosin VI)

Additional Information