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Int J Biol Macromol. 2017 Apr;97:460-467. doi: 10.1016/j.ijbiomac.2017.01.067. Epub 2017 Jan 15.

The non-canonical NOTCH1 ligand Delta-like 1 homolog (DLK1) self interacts in mammals.

Author information

1
Laboratory of Molecular and Cellular Cardiology, Dep. of Clinical Biochemistry and Pharmacology, 5000 Odense C, Denmark; Cardiovascular and Renal Research (University of Southern Denmark), Winsloewparken 21(3rd), 5000 Odense C, Denmark.
2
Laboratory of Molecular and Cellular Cardiology, Dep. of Clinical Biochemistry and Pharmacology, 5000 Odense C, Denmark; Danish Center for Regenerative Medicine (Odense University Hospital), 5000 Odense C, Denmark.
3
Department of Inorganic and Organic Chemistry and Biochemistry, University of Castilla-La Mancha Medical School, Albacete, Spain.
4
Clinical Institute (University of Southern Denmark), 5000 Odense C, Denmark; Dep. of Clinical Biochemistry and Pharmacology (OUH), Denmark.
5
Laboratory of Molecular and Cellular Cardiology, Dep. of Clinical Biochemistry and Pharmacology, 5000 Odense C, Denmark; Danish Center for Regenerative Medicine (Odense University Hospital), 5000 Odense C, Denmark; Clinical Institute (University of Southern Denmark), 5000 Odense C, Denmark.
6
Laboratory of Molecular and Cellular Cardiology, Dep. of Clinical Biochemistry and Pharmacology, 5000 Odense C, Denmark; Danish Center for Regenerative Medicine (Odense University Hospital), 5000 Odense C, Denmark; Cardiovascular and Renal Research (University of Southern Denmark), Winsloewparken 21(3rd), 5000 Odense C, Denmark. Electronic address: dandersen@health.sdu.dk.

Abstract

Delta-like 1 homolog (DLK1) is an imprinted gene, which is widely expressed during mammalian development and plays a pivotal role in differentiation of various tissue types. Most recently, we have shown that DLK1 interacts with NOTCH1, yet several Notch independent mechanisms have previously been suggested as well, but only poorly confirmed in a mammalian context. In the present study, we employed the mammalian two-hybrid (MTH) system, a genetic in vivo protein-protein interaction system, to show robust DLK1-DLK1, DLK1-FnI (Fibronectin) and DLK1-CFR (cysteine-rich FGF receptor) interactions, whereas the proposed DLK1-IGFBP1 interaction was not supported by MTH. Very little has previously been described on the DLK1 self-interaction. Herein, we showed by immunoprecipitation as well as Sulfo-SBED label transfer that the DLK1-DLK1 interaction likely is part of Dlk1's function in preadipocytes. Furthermore our data suggest that DLK1 interacts with itself through EGF domain 4 and 5, which is distinct from the recently described NOTCH1-DLK1 interaction, which occurs between EGF domain 5 and 6. This opens up the possibility that Notch independent mechanisms like the DLK1-DLK1 interaction may modulate the non-canonical NOTCH1-DLK1 interaction further complexing this system.

KEYWORDS:

Delta-like 1 homolog (Dlk1); EGF-repeats; Ligand; Receptor; Self-interacting protein

PMID:
28099888
DOI:
10.1016/j.ijbiomac.2017.01.067
[Indexed for MEDLINE]

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