NDLI: VRK2 anchors KSR1-MEK1 to endoplasmic reticulum forming a macromolecular complex that compartmentalizes MAPK signaling

Content Provider	Springer Nature Link
Author	Fernández, Isabel F. Pérez Rivas, Luis G. Blanco, Sandra Castillo Dominguez, Adrián A. Loza, José Lazo, Pedro A.
Copyright Year	2012
Abstract	The spatial and temporal regulation of intracellular signaling is determined by the spatial and temporal organization of complexes assembled on scaffold proteins, which can be modulated by their interactions with additional proteins as well as subcellular localization. The scaffold KSR1 protein interacts with MAPK forming a complex that conveys a differential signaling in response to growth factors. The aim of this work is to determine the unknown mechanism by which VRK2A downregulates MAPK signaling. We have characterized the multiprotein complex formed by KSR1 and the Ser-Thr kinase VRK2A. VRK2A is a protein bound to the endoplasmic reticulum (ER) and retains a fraction of KSR1 complexes on the surface of this organelle. Both proteins, VRK2A and KSR1, directly interact by their respective C-terminal regions. In addition, MEK1 is also incorporated in the basal complex. MEK1 independently interacts with the CA5 region of KSR1 and with the N-terminus of VRK2A. Thus, VRK2A can form a high molecular size (600–1,000 kDa) stable complex with both MEK1 and KSR1. Knockdown of VRK2A resulted in disassembly of these high molecular size complexes. Overexpression of VRK2A increased the amount of KSR1 in the particulate fraction and prevented the incorporation of ERK1/2 into the complex after stimulation with EGF. Neither VRK2A nor KSR1 interact with the VHR, MKP1, MKP2, or MKP3 phosphatases. The KSR1 complex assembled and retained by VRK2A in the ER can have a modulatory effect on the signal mediated by MAPK, thus locally affecting the magnitude of its responses, and can explain differential responses depending on cell type.
Starting Page	3881
Ending Page	3893
Page Count	13
File Format	PDF
ISSN	1420682X
Journal	Cellular and Molecular Life Sciences
Volume Number	69
Issue Number	22
e-ISSN	14209071
Language	English
Publisher	SP Birkhäuser Verlag Basel
Publisher Date	2012-07-04
Publisher Place	Basel
Access Restriction	Subscribed
Subject Keyword	VRK2 KSR1 MAPK ERK EGF Cell signaling Life Sciences Biomedicine general Cell Biology Biochemistry
Content Type	Text
Resource Type	Article
Subject	Cell Biology Molecular Biology Molecular Medicine Pharmacology Cellular and Molecular Neuroscience

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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