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Coupling of the nucleus and cytoplasm: role of the LINC complex

Crisp, M; Liu, Q; Roux, K; Rattner, JB; Shanahan, C; Burke, B; Stahl, PD; Hodzic, D

Coupling of the nucleus and cytoplasm: role of the LINC complex Thumbnail


Authors

M Crisp

Q Liu

K Roux

JB Rattner

C Shanahan

B Burke

PD Stahl

D Hodzic



Abstract

The nuclear envelope defines the barrier between the nucleus and cytoplasm and features inner and outer membranes separated by a perinuclear space (PNS). The inner nuclear membrane contains specific integral proteins that include Sun1 and Sun2. Although the outer nuclear membrane (ONM) is continuous with the endoplasmic reticulum, it is nevertheless enriched in several integral membrane proteins, including nesprin 2 Giant (nesp2G), an 800-kD protein featuring an NH2-terminal actin-binding domain. A recent study (Padmakumar, V.C., T. Libotte, W. Lu, H. Zaim, S. Abraham, A.A. Noegel, J. Gotzmann, R. Foisner, and I. Karakesisoglou. 2005. J. Cell Sci. 118:3419–3430) has shown that localization of nesp2G to the ONM is dependent upon an interaction with Sun1. In this study, we confirm and extend these results by demonstrating that both Sun1 and Sun2 contribute to nesp2G localization. Codepletion of both of these proteins in HeLa cells leads to the loss of ONM-associated nesp2G, as does overexpression of the Sun1 lumenal domain. Both treatments result in the expansion of the PNS. These data, together with those of Padmakumar et al. (2005), support a model in which Sun proteins tether nesprins in the ONM via interactions spanning the PNS. In this way, Sun proteins and nesprins form a complex that links the nucleoskeleton and cytoskeleton (the LINC complex).

Citation

Crisp, M., Liu, Q., Roux, K., Rattner, J., Shanahan, C., Burke, B., …Hodzic, D. (2006). Coupling of the nucleus and cytoplasm: role of the LINC complex. Journal of Cell Biology, 172(1), 41-53. https://doi.org/10.1083/jcb.200509124

Journal Article Type Article
Publication Date Jan 1, 2006
Deposit Date Aug 29, 2008
Publicly Available Date Mar 29, 2024
Journal Journal of Cell Biology
Print ISSN 0021-9525
Electronic ISSN 1540-8140
Publisher Rockefeller University Press
Peer Reviewed Peer Reviewed
Volume 172
Issue 1
Pages 41-53
DOI https://doi.org/10.1083/jcb.200509124

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