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Wang SQ, Shi DQ, Long YP, Liu J, Yang WC. GAMETOPHYTE DEFECTIVE 1, a putative subunit of RNases P/MRP, is essential for female gametogenesis and male competence in Arabidopsis. PLoS One 2012; 7:e33595. [PMID: 22509260 PMCID: PMC3324470 DOI: 10.1371/journal.pone.0033595] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2011] [Accepted: 02/13/2012] [Indexed: 01/15/2023] Open
Abstract
RNA biogenesis, including biosynthesis and maturation of rRNA, tRNA and mRNA, is a fundamental process that is critical for cell growth, division and differentiation. Previous studies showed that mutations in components involved in RNA biogenesis resulted in abnormalities in gametophyte and leaf development in Arabidopsis. In eukaryotes, RNases P/MRP (RNase mitochondrial RNA processing) are important ribonucleases that are responsible for processing of tRNA, and transcription of small non-coding RNAs. Here we report that Gametophyte Defective 1 (GAF1), a gene encoding a predicted protein subunit of RNases P/MRP, AtRPP30, plays a role in female gametophyte development and male competence. Embryo sacs were arrested at stages ranging from FG1 to FG7 in gaf1 mutant, suggesting that the progression of the gametophytic division during female gametogenesis was impaired in gaf1 mutant. In contrast, pollen development was not affected in gaf1. However, the fitness of the mutant pollen tube was weaker than that of the wild-type, leading to reduced transmission through the male gametes. GAF1 is featured as a typical RPP30 domain protein and interacts physically with AtPOP5, a homologue of RNases P/MRP subunit POP5 of yeast. Together, our data suggest that components of the RNases P/MRP family, such as RPP30, play important roles in gametophyte development and function in plants.
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Affiliation(s)
- Si-Qi Wang
- State Key Laboratory of Molecular Developmental Biology, National Centre for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China
| | - Dong-Qiao Shi
- State Key Laboratory of Molecular Developmental Biology, National Centre for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China
- * E-mail: (DQS); (WCY)
| | - Yan-Ping Long
- State Key Laboratory of Molecular Developmental Biology, National Centre for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China
| | - Jie Liu
- State Key Laboratory of Molecular Developmental Biology, National Centre for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China
| | - Wei-Cai Yang
- State Key Laboratory of Molecular Developmental Biology, National Centre for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China
- * E-mail: (DQS); (WCY)
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Hands-Taylor KLD, Martino L, Tata R, Babon JJ, Bui TT, Drake AF, Beavil RL, Pruijn GJM, Brown PR, Conte MR. Heterodimerization of the human RNase P/MRP subunits Rpp20 and Rpp25 is a prerequisite for interaction with the P3 arm of RNase MRP RNA. Nucleic Acids Res 2010; 38:4052-66. [PMID: 20215441 PMCID: PMC2896528 DOI: 10.1093/nar/gkq141] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
Rpp20 and Rpp25 are two key subunits of the human endoribonucleases RNase P and MRP. Formation of an Rpp20–Rpp25 complex is critical for enzyme function and sub-cellular localization. We present the first detailed in vitro analysis of their conformational properties, and a biochemical and biophysical characterization of their mutual interaction and RNA recognition. This study specifically examines the role of the Rpp20/Rpp25 association in the formation of the ribonucleoprotein complex. The interaction of the individual subunits with the P3 arm of the RNase MRP RNA is revealed to be negligible whereas the 1:1 Rpp20:Rpp25 complex binds to the same target with an affinity of the order of nM. These results unambiguously demonstrate that Rpp20 and Rpp25 interact with the P3 RNA as a heterodimer, which is formed prior to RNA binding. This creates a platform for the design of future experiments aimed at a better understanding of the function and organization of RNase P and MRP. Finally, analyses of interactions with deletion mutant proteins constructed with successively shorter N- and C-terminal sequences indicate that the Alba-type core domain of both Rpp20 and Rpp25 contains most of the determinants for mutual association and P3 RNA recognition.
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Affiliation(s)
- Katherine L. D. Hands-Taylor
- Randall Division of Cell and Molecular Biophysics, King’s College London, New Hunt’s House, Guy’s Campus, London SE1 1UL, UK, Structural Biology Division, Walter and Eliza Hall Institute of Medical Research, 1G Royal Pde, Parkville 3052, VIC, Australia, Pharmaceutical Science Division, King’s College London, The Wolfson Wing, Hodgkin Building, Guy's Campus, London SE1 1UL, UK and Department of Biomolecular Chemistry, Nijmegen Centre for Molecular Life Sciences, Institute for Molecules and Materials, Radboud University of Nijmegen, Nijmegen, The Netherlands
| | - Luigi Martino
- Randall Division of Cell and Molecular Biophysics, King’s College London, New Hunt’s House, Guy’s Campus, London SE1 1UL, UK, Structural Biology Division, Walter and Eliza Hall Institute of Medical Research, 1G Royal Pde, Parkville 3052, VIC, Australia, Pharmaceutical Science Division, King’s College London, The Wolfson Wing, Hodgkin Building, Guy's Campus, London SE1 1UL, UK and Department of Biomolecular Chemistry, Nijmegen Centre for Molecular Life Sciences, Institute for Molecules and Materials, Radboud University of Nijmegen, Nijmegen, The Netherlands
| | - Renée Tata
- Randall Division of Cell and Molecular Biophysics, King’s College London, New Hunt’s House, Guy’s Campus, London SE1 1UL, UK, Structural Biology Division, Walter and Eliza Hall Institute of Medical Research, 1G Royal Pde, Parkville 3052, VIC, Australia, Pharmaceutical Science Division, King’s College London, The Wolfson Wing, Hodgkin Building, Guy's Campus, London SE1 1UL, UK and Department of Biomolecular Chemistry, Nijmegen Centre for Molecular Life Sciences, Institute for Molecules and Materials, Radboud University of Nijmegen, Nijmegen, The Netherlands
| | - Jeffrey J. Babon
- Randall Division of Cell and Molecular Biophysics, King’s College London, New Hunt’s House, Guy’s Campus, London SE1 1UL, UK, Structural Biology Division, Walter and Eliza Hall Institute of Medical Research, 1G Royal Pde, Parkville 3052, VIC, Australia, Pharmaceutical Science Division, King’s College London, The Wolfson Wing, Hodgkin Building, Guy's Campus, London SE1 1UL, UK and Department of Biomolecular Chemistry, Nijmegen Centre for Molecular Life Sciences, Institute for Molecules and Materials, Radboud University of Nijmegen, Nijmegen, The Netherlands
| | - Tam T. Bui
- Randall Division of Cell and Molecular Biophysics, King’s College London, New Hunt’s House, Guy’s Campus, London SE1 1UL, UK, Structural Biology Division, Walter and Eliza Hall Institute of Medical Research, 1G Royal Pde, Parkville 3052, VIC, Australia, Pharmaceutical Science Division, King’s College London, The Wolfson Wing, Hodgkin Building, Guy's Campus, London SE1 1UL, UK and Department of Biomolecular Chemistry, Nijmegen Centre for Molecular Life Sciences, Institute for Molecules and Materials, Radboud University of Nijmegen, Nijmegen, The Netherlands
| | - Alex F. Drake
- Randall Division of Cell and Molecular Biophysics, King’s College London, New Hunt’s House, Guy’s Campus, London SE1 1UL, UK, Structural Biology Division, Walter and Eliza Hall Institute of Medical Research, 1G Royal Pde, Parkville 3052, VIC, Australia, Pharmaceutical Science Division, King’s College London, The Wolfson Wing, Hodgkin Building, Guy's Campus, London SE1 1UL, UK and Department of Biomolecular Chemistry, Nijmegen Centre for Molecular Life Sciences, Institute for Molecules and Materials, Radboud University of Nijmegen, Nijmegen, The Netherlands
| | - Rebecca L. Beavil
- Randall Division of Cell and Molecular Biophysics, King’s College London, New Hunt’s House, Guy’s Campus, London SE1 1UL, UK, Structural Biology Division, Walter and Eliza Hall Institute of Medical Research, 1G Royal Pde, Parkville 3052, VIC, Australia, Pharmaceutical Science Division, King’s College London, The Wolfson Wing, Hodgkin Building, Guy's Campus, London SE1 1UL, UK and Department of Biomolecular Chemistry, Nijmegen Centre for Molecular Life Sciences, Institute for Molecules and Materials, Radboud University of Nijmegen, Nijmegen, The Netherlands
| | - Ger J. M. Pruijn
- Randall Division of Cell and Molecular Biophysics, King’s College London, New Hunt’s House, Guy’s Campus, London SE1 1UL, UK, Structural Biology Division, Walter and Eliza Hall Institute of Medical Research, 1G Royal Pde, Parkville 3052, VIC, Australia, Pharmaceutical Science Division, King’s College London, The Wolfson Wing, Hodgkin Building, Guy's Campus, London SE1 1UL, UK and Department of Biomolecular Chemistry, Nijmegen Centre for Molecular Life Sciences, Institute for Molecules and Materials, Radboud University of Nijmegen, Nijmegen, The Netherlands
| | - Paul R. Brown
- Randall Division of Cell and Molecular Biophysics, King’s College London, New Hunt’s House, Guy’s Campus, London SE1 1UL, UK, Structural Biology Division, Walter and Eliza Hall Institute of Medical Research, 1G Royal Pde, Parkville 3052, VIC, Australia, Pharmaceutical Science Division, King’s College London, The Wolfson Wing, Hodgkin Building, Guy's Campus, London SE1 1UL, UK and Department of Biomolecular Chemistry, Nijmegen Centre for Molecular Life Sciences, Institute for Molecules and Materials, Radboud University of Nijmegen, Nijmegen, The Netherlands
| | - Maria R. Conte
- Randall Division of Cell and Molecular Biophysics, King’s College London, New Hunt’s House, Guy’s Campus, London SE1 1UL, UK, Structural Biology Division, Walter and Eliza Hall Institute of Medical Research, 1G Royal Pde, Parkville 3052, VIC, Australia, Pharmaceutical Science Division, King’s College London, The Wolfson Wing, Hodgkin Building, Guy's Campus, London SE1 1UL, UK and Department of Biomolecular Chemistry, Nijmegen Centre for Molecular Life Sciences, Institute for Molecules and Materials, Radboud University of Nijmegen, Nijmegen, The Netherlands
- *To whom correspondence should be addressed. Tel: +44 20 7848 6194; Fax: +44 20 7848 6435;
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