1
|
Takahashi M, Umetsu K, Oono Y, Higaki T, Blancaflor EB, Rahman A. Small acidic protein 1 and SCF TIR1 ubiquitin proteasome pathway act in concert to induce 2,4-dichlorophenoxyacetic acid-mediated alteration of actin in Arabidopsis roots. Plant J 2017; 89:940-956. [PMID: 27885735 DOI: 10.1111/tpj.13433] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2016] [Revised: 11/09/2016] [Accepted: 11/14/2016] [Indexed: 06/06/2023]
Abstract
2,4-Dichlorophenoxyacetic acid (2,4-D), a functional analogue of auxin, is used as an exogenous source of auxin as it evokes physiological responses like the endogenous auxin, indole-3-acetic acid (IAA). Previous molecular analyses of the auxin response pathway revealed that IAA and 2,4-D share a common mode of action to elicit downstream physiological responses. However, recent findings with 2,4-D-specific mutants suggested that 2,4-D and IAA might also use distinct pathways to modulate root growth in Arabidopsis. Using genetic and cellular approaches, we demonstrate that the distinct effects of 2,4-D and IAA on actin filament organization partly dictate the differential responses of roots to these two auxin analogues. 2,4-D but not IAA altered the actin structure in long-term and short-term assays. Analysis of the 2,4-D-specific mutant aar1-1 revealed that small acidic protein 1 (SMAP1) functions positively to facilitate the 2,4-D-induced depolymerization of actin. The ubiquitin proteasome mutants tir1-1 and axr1-12, which show enhanced resistance to 2,4-D compared with IAA for inhibition of root growth, were also found to have less disrupted actin filament networks after 2,4-D exposure. Consistently, a chemical inhibitor of the ubiquitin proteasome pathway mitigated the disrupting effects of 2,4-D on the organization of actin filaments. Roots of the double mutant aar1-1 tir1-1 also showed enhanced resistance to 2,4-D-induced inhibition of root growth and actin degradation compared with their respective parental lines. Collectively, these results suggest that the effects of 2,4-D on actin filament organization and root growth are mediated through synergistic interactions between SMAP1 and SCFTIR1 ubiquitin proteasome components.
Collapse
Affiliation(s)
- Maho Takahashi
- Cryobiofrontier Research Center, Faculty of Agriculture, Iwate University, Morioka, 020-8550, Japan
| | - Kana Umetsu
- Cryobiofrontier Research Center, Faculty of Agriculture, Iwate University, Morioka, 020-8550, Japan
| | - Yutaka Oono
- Department of Radiation-Applied Biology, Quantum Beam Science Research Directorate, National Institutes for Quantum and Radiological Science and Technology (QST), Takasaki, 370-1292, Japan
| | - Takumi Higaki
- Department of Integrated Biosciences, Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, 277-8562, Japan
| | - Elison B Blancaflor
- Plant Biology Division, The Samuel Roberts Noble Foundation, Ardmore, OK, 73401, USA
| | - Abidur Rahman
- Cryobiofrontier Research Center, Faculty of Agriculture, Iwate University, Morioka, 020-8550, Japan
- Department of Plant Bio Sciences, Faculty of Agriculture, Iwate University, Morioka, 020-8550, Japan
| |
Collapse
|
2
|
Sumiyoshi M, Masuda N, Tanuma N, Ogoh H, Imai E, Otsuka M, Hayakawa N, Ohno K, Matsui Y, Hara K, Gotoh R, Suzuki M, Rai S, Tanaka H, Matsumura I, Shima H, Watanabe T. Mice doubly-deficient in the Arf GAPs SMAP1 and SMAP2 exhibit embryonic lethality. FEBS Lett 2015; 589:2754-62. [PMID: 26296315 DOI: 10.1016/j.febslet.2015.07.050] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2015] [Revised: 07/25/2015] [Accepted: 07/28/2015] [Indexed: 12/24/2022]
Abstract
In mammals, the small Arf GTPase-activating protein (SMAP) subfamily of Arf GTPase-activating proteins consists of closely related members, SMAP1 and SMAP2. These factors reportedly exert distinct functions in membrane trafficking, as manifested by different phenotypes seen in single knockout mice. The present study investigated whether SMAP proteins interact genetically. We report for the first time that simultaneous loss of SMAP1 and SMAP2 promotes apoptosis in the distal region of E7.5 mouse embryos, likely resulting in embryonic lethality. Thus, at least one SMAP gene, either SMAP1 or SMAP2, is required for proper embryogenesis.
Collapse
Affiliation(s)
- Mami Sumiyoshi
- Department of Biological Science, Graduate School of Humanities and Sciences, Nara Women's University, Nara, Japan
| | - Narumi Masuda
- Department of Biological Science, Graduate School of Humanities and Sciences, Nara Women's University, Nara, Japan
| | - Nobuhiro Tanuma
- Division of Cancer Chemotherapy, Miyagi Cancer Center Research Institute, Miyagi, Japan
| | - Honami Ogoh
- Department of Biological Science, Graduate School of Humanities and Sciences, Nara Women's University, Nara, Japan
| | - Eri Imai
- Department of Biological Science, Graduate School of Humanities and Sciences, Nara Women's University, Nara, Japan
| | - Mizuki Otsuka
- Department of Biological Science, Graduate School of Humanities and Sciences, Nara Women's University, Nara, Japan
| | - Natsuki Hayakawa
- Department of Biological Science, Graduate School of Humanities and Sciences, Nara Women's University, Nara, Japan
| | - Kinuyo Ohno
- Department of Biological Science, Graduate School of Humanities and Sciences, Nara Women's University, Nara, Japan
| | - Yasuhisa Matsui
- Cell Resource Center for Biomedical Research, Institute of Development, Aging and Cancer, Tohoku University, Miyagi, Japan
| | - Kanae Hara
- Department of Biological Science, Graduate School of Humanities and Sciences, Nara Women's University, Nara, Japan
| | - Risa Gotoh
- Department of Biological Science, Graduate School of Humanities and Sciences, Nara Women's University, Nara, Japan
| | - Mai Suzuki
- Department of Biological Science, Graduate School of Humanities and Sciences, Nara Women's University, Nara, Japan
| | - Shinya Rai
- Department of Hematology and Rheumatology, Kinki University Faculty of Medicine, Osaka, Japan
| | - Hirokazu Tanaka
- Department of Hematology and Rheumatology, Kinki University Faculty of Medicine, Osaka, Japan
| | - Itaru Matsumura
- Department of Hematology and Rheumatology, Kinki University Faculty of Medicine, Osaka, Japan
| | - Hiroshi Shima
- Division of Cancer Chemotherapy, Miyagi Cancer Center Research Institute, Miyagi, Japan
| | - Toshio Watanabe
- Department of Biological Science, Graduate School of Humanities and Sciences, Nara Women's University, Nara, Japan.
| |
Collapse
|
3
|
Wächter K, Kowarz E, Marschalek R. Functional characterisation of different MLL fusion proteins by using inducible Sleeping Beauty vectors. Cancer Lett 2014; 352:196-202. [PMID: 25016062 DOI: 10.1016/j.canlet.2014.06.016] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2014] [Revised: 06/18/2014] [Accepted: 06/24/2014] [Indexed: 11/28/2022]
Abstract
Our focus is the identification, characterisation and functional analysis of different MLL fusions. In general, MLL fusion proteins are encoded by large cDNA cassettes that are difficult to transduce into haematopoietic stem cells. This is due to the size limitations of the packaging process of those vector-encoded RNAs into retro- or lentiviral particles. Here, we present our efforts in establishing a universal vector system to analyse different MLL fusions. The universal cloning system was embedded into the backbone of the Sleeping Beauty transposable element. This transposon has no size limitation and displays no integration preference, thereby avoiding the integration into active genes or their promoter regions. We utilised this novel system to test different MLL fusion alleles (MLL-NEBL, NEBL-MLL, MLL-LASP1, LASP1-MLL, MLL-MAML2, MAML2-MLL, MLL-SMAP1 and SMAP1-MLL) in appropriate cell lines. Stable cell lines were analysed for their growth behaviour, focus formation and colony formation capacity and ectopic Hoxa gene transcription. Our results show that only 1/4 tested direct MLL fusions, but 3/4 tested reciprocal MLL fusions exhibit oncogenic functions. From these pilot experiments, we conclude that a systematic analysis of more MLL fusions will result in a more differentiated picture about the oncogenic capacity of distinct MLL fusions.
Collapse
Affiliation(s)
- K Wächter
- Institute of Pharm. Biology/DCAL, Goethe-University, Frankfurt/Main, Germany
| | - E Kowarz
- Institute of Pharm. Biology/DCAL, Goethe-University, Frankfurt/Main, Germany
| | - R Marschalek
- Institute of Pharm. Biology/DCAL, Goethe-University, Frankfurt/Main, Germany.
| |
Collapse
|
4
|
Oono Y, Nakasone A. Lack of SMALL ACIDIC PROTEIN 1 ( SMAP1) causes increased sensitivity to an inhibitor of RUB/NEDD8-activating enzyme in Arabidopsis seedlings. Plant Signal Behav 2013; 8:25986. [PMID: 24270629 PMCID: PMC4091117 DOI: 10.4161/psb.25986] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2013] [Revised: 07/30/2013] [Accepted: 07/31/2013] [Indexed: 06/02/2023]
Abstract
SMALL ACIDIC PROTEIN 1 (SMAP1) functions upstream of the degradation of AUX/IAA-proteins in the response to 2,4-dichlorophenoxyacetic acid and physically interacts with the COP9 SIGNALOSOME (CSN). Also, its function is linked to RELATED TO UBIQUITIN (RUB) modification. To further investigate the relationship between SMAP1 and the RUB modification system, we examined the effect of MLN4924, an inhibitor of RUB/NEDD8-activating E1 enzyme, on the growth of Arabidopsis thaliana. We found that the anti-auxin resistant 1 mutants, which lack SMAP1, are more sensitive to MLN4924 than wild type and that SMAP1 is responsible for this hypersensitivity. This new evidence supports our previous speculation that SMAP1 acts in Cullin-RING ubiquitin E3 ligase regulated signaling processes via its interaction with components associated with the RUB modification system.
Collapse
Affiliation(s)
- Yutaka Oono
- Medical and Biotechnological Application Division; Japan Atomic Energy Agency (JAEA); Takasaki, Japan
| | - Akari Nakasone
- Medical and Biotechnological Application Division; Japan Atomic Energy Agency (JAEA); Takasaki, Japan
- Current affiliation: Department of Science and Engineering; Saitama University; Saitama, Japan
| |
Collapse
|