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Phosphorylation of high-mobility group protein A2 by Nek2 kinase during the first meiotic division in mouse spermatocytes
- Source :
- Molecular biology of the cell 15 (2004): 1224–1232., info:cnr-pdr/source/autori:Di Agostino S, Fedele M, Chieffi P, Fusco A, Rossi P, Geremia R, Sette C./titolo:Phosphorylation of high-mobility group protein A2 by Nek2 kinase during the first meiotic division in mouse spermatocytes./doi:/rivista:Molecular biology of the cell/anno:2004/pagina_da:1224/pagina_a:1232/intervallo_pagine:1224–1232/volume:15
- Publication Year :
- 2004
- Publisher :
- The American Society for Cell Biology, 2004.
-
Abstract
- The mitogen-activated protein kinase (MAPK) pathway is required for maintaining the chromatin condensed during the two meiotic divisions and to avoid a second round of DNA duplication. However, molecular targets of the MAPK pathway on chromatin have not yet been identified. Here, we show that the architectural chromatin protein HMGA2 is highly expressed in male meiotic cells. Furthermore, Nek2, a serine-threonine kinase activated by the MAPK pathway in mouse pachytene spermatocytes, directly interacts with HMGA2 in vitro and in mouse spermatocytes. The interaction does not depend on the activity of Nek2 and seems constitutive. On progression from pachytene to metaphase, Nek2 is activated and HMGA2 is phosphorylated in an MAPK-dependent manner. We also show that Nek2 phosphorylates in vitro HMGA2 and that this phosphorylation decreases the affinity of HMGA2 for DNA and might favor its release from the chromatin. Indeed, we find that most HMGA2 associates with chromatin in mouse pachytene spermatocytes, whereas it is excluded from the chromatin upon the G2/M progression. Because hmga2-/- mice are sterile and show a dramatic impairment of spermatogenesis, it is possible that the functional interaction between HMGA2 and Nek2 plays a crucial role in the correct process of chromatin condensation in meiosis.
- Subjects :
- MAPK/ERK pathway
Male
HMGA2
Cells
Biology
Protein Serine-Threonine Kinases
DNA-binding protein
Chromatin remodeling
Mice
Prophase
Spermatocytes
NIMA-Related Kinases
Animals
Cloning, Molecular
Phosphorylation
Protein kinase A
Molecular Biology
Cells, Cultured
Settore BIO/16
Cultured
Kinase
HMGA2 Protein
Molecular
Cell Biology
Articles
Protein-Serine-Threonine Kinases
Molecular biology
Chromatin
Cell biology
DNA-Binding Proteins
NEK2
Meiosis
Protein Binding
Mitogen-Activated Protein Kinases
Spermatogenesis
Cloning
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Molecular biology of the cell 15 (2004): 1224–1232., info:cnr-pdr/source/autori:Di Agostino S, Fedele M, Chieffi P, Fusco A, Rossi P, Geremia R, Sette C./titolo:Phosphorylation of high-mobility group protein A2 by Nek2 kinase during the first meiotic division in mouse spermatocytes./doi:/rivista:Molecular biology of the cell/anno:2004/pagina_da:1224/pagina_a:1232/intervallo_pagine:1224–1232/volume:15
- Accession number :
- edsair.doi.dedup.....e7cfe7a15b3016bdcf85710538378081