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The highly conserved nuclear lamin Ig-fold binds to PCNA: its role in DNA replication.

Shumaker, Dale K. and Solimando, Liliana and Sengupta, Kaushik and Shimi, Takeshi and Adam, Stephen A. and Grunwald, Antje and Strelkov, Sergei V. and Aebi, Ueli and Cardoso, M Cristina and Goldman, Robert D. (2008):
The highly conserved nuclear lamin Ig-fold binds to PCNA: its role in DNA replication.
In: The Journal of cell biology, 181 (2), pp. 269-80, ISSN 1540-8140,
[Online-Edition: http://www.cardoso-lab.org/publications/Shumaker%202008.pdf],
[Article]

Abstract

This study provides insights into the role of nuclear lamins in DNA replication. Our data demonstrate that the Ig-fold motif located in the lamin C terminus binds directly to proliferating cell nuclear antigen (PCNA), the processivity factor necessary for the chain elongation phase of DNA replication. We find that the introduction of a mutation in the Ig-fold, which alters its structure and causes human muscular dystrophy, inhibits PCNA binding. Studies of nuclear assembly and DNA replication show that lamins, PCNA, and chromatin are closely associated in situ. Exposure of replicating nuclei to an excess of the lamin domain containing the Ig-fold inhibits DNA replication in a concentration-dependent fashion. This inhibitory effect is significantly diminished in nuclei exposed to the same domain bearing the Ig-fold mutation. Using the crystal structures of the lamin Ig-fold and PCNA, molecular docking simulations suggest probable interaction sites. These findings also provide insights into the mechanisms underlying the numerous disease-causing mutations located within the lamin Ig-fold.

Item Type: Article
Erschienen: 2008
Creators: Shumaker, Dale K. and Solimando, Liliana and Sengupta, Kaushik and Shimi, Takeshi and Adam, Stephen A. and Grunwald, Antje and Strelkov, Sergei V. and Aebi, Ueli and Cardoso, M Cristina and Goldman, Robert D.
Title: The highly conserved nuclear lamin Ig-fold binds to PCNA: its role in DNA replication.
Language: English
Abstract:

This study provides insights into the role of nuclear lamins in DNA replication. Our data demonstrate that the Ig-fold motif located in the lamin C terminus binds directly to proliferating cell nuclear antigen (PCNA), the processivity factor necessary for the chain elongation phase of DNA replication. We find that the introduction of a mutation in the Ig-fold, which alters its structure and causes human muscular dystrophy, inhibits PCNA binding. Studies of nuclear assembly and DNA replication show that lamins, PCNA, and chromatin are closely associated in situ. Exposure of replicating nuclei to an excess of the lamin domain containing the Ig-fold inhibits DNA replication in a concentration-dependent fashion. This inhibitory effect is significantly diminished in nuclei exposed to the same domain bearing the Ig-fold mutation. Using the crystal structures of the lamin Ig-fold and PCNA, molecular docking simulations suggest probable interaction sites. These findings also provide insights into the mechanisms underlying the numerous disease-causing mutations located within the lamin Ig-fold.

Journal or Publication Title: The Journal of cell biology
Volume: 181
Number: 2
Divisions: 10 Department of Biology > Cell Biology and Epigenetics
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10 Department of Biology
Date Deposited: 06 Mar 2010 15:52
Official URL: http://www.cardoso-lab.org/publications/Shumaker%202008.pdf
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