Cloning and Characterization of Two Putative P-Type ATPases from the Marine Microalga <i>Dunaliella maritima</i> Similar to Plant H<sup>+</sup>-ATPases and Their Gene Expression Analysis under Conditions of Hyperosmotic Salt Shock
The green microalga genus <i>Dunaliella</i> is mostly comprised of species that exhibit a wide range of salinity tolerance, including inhabitants of hyperhaline reservoirs. Na<sup>+</sup> content in <i>Dunaliella</i> cells inhabiting saline environments is maintai...
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2021-12-01
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| author | Dmitrii A. Matalin Dmitrii E. Khramov Alexey V. Shuvalov Vadim S. Volkov Yurii V. Balnokin Larissa G. Popova |
| author_facet | Dmitrii A. Matalin Dmitrii E. Khramov Alexey V. Shuvalov Vadim S. Volkov Yurii V. Balnokin Larissa G. Popova |
| author_sort | Dmitrii A. Matalin |
| collection | DOAJ |
| description | The green microalga genus <i>Dunaliella</i> is mostly comprised of species that exhibit a wide range of salinity tolerance, including inhabitants of hyperhaline reservoirs. Na<sup>+</sup> content in <i>Dunaliella</i> cells inhabiting saline environments is maintained at a fairly low level, comparable to that in the cells of freshwater organisms. However, despite a long history of studying the physiological and molecular mechanisms that ensure the ability of halotolerant <i>Dunaliella</i> species to survive at high concentrations of NaCl, the question of how <i>Dunaliella</i> cells remove excess Na<sup>+</sup> ions entering from the environment is still debatable. For thermodynamic reasons it should be a primary active mechanism; for example, via a Na<sup>+</sup>-transporting ATPase, but the molecular identification of Na<sup>+</sup>-transporting mechanism in <i>Dunaliella</i> has not yet been carried out. Formerly, in the euryhaline alga <i>D. maritima</i>, we functionally identified Na<sup>+</sup>-transporting P-type ATPase in experiments with plasma membrane (PM) vesicles which were isolated from this alga. Here we describe the cloning of two putative P-type ATPases from <i>D. maritima</i>, <i>Dm</i>HA1 and <i>Dm</i>HA2. Phylogenetic analysis showed that both ATPases belong to the clade of proton P-type ATPases, but the similarity between <i>Dm</i>HA1 and <i>Dm</i>HA2 is not high. The expression of <i>Dm</i>HA1 and <i>Dm</i>HA2 in <i>D. maritima</i> cells under hyperosmotic salt shock was studied by qRT-PCR. Expression of <i>DmHA1</i> gene decreases and remains at a relatively low level during the response of <i>D. maritima</i> cells to hyperosmotic salt shock. In contrast, expression of <i>DmHA2</i> increases under hyperosmotic salt shock. This indicates that <i>Dm</i>HA2 is important for overcoming hyperosmotic salt stress by the algal cells and as an ATPase it is likely directly involved in transport of Na<sup>+</sup> ions. We assume that it is the <i>Dm</i>HA2 ATPase that represents the Na<sup>+</sup>-transporting ATPase. |
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| spelling | doaj.art-1e801e34a28e41afa8c2f95acc4a99c82023-11-23T10:11:27ZengMDPI AGPlants2223-77472021-12-011012266710.3390/plants10122667Cloning and Characterization of Two Putative P-Type ATPases from the Marine Microalga <i>Dunaliella maritima</i> Similar to Plant H<sup>+</sup>-ATPases and Their Gene Expression Analysis under Conditions of Hyperosmotic Salt ShockDmitrii A. Matalin0Dmitrii E. Khramov1Alexey V. Shuvalov2Vadim S. Volkov3Yurii V. Balnokin4Larissa G. Popova5K.A.Timiryazev Institute of Plant Physiology RAS, 127276 Moscow, RussiaK.A.Timiryazev Institute of Plant Physiology RAS, 127276 Moscow, RussiaEngelhardt Institute of Molecular Biology RAS, 119991 Moscow, RussiaK.A.Timiryazev Institute of Plant Physiology RAS, 127276 Moscow, RussiaK.A.Timiryazev Institute of Plant Physiology RAS, 127276 Moscow, RussiaK.A.Timiryazev Institute of Plant Physiology RAS, 127276 Moscow, RussiaThe green microalga genus <i>Dunaliella</i> is mostly comprised of species that exhibit a wide range of salinity tolerance, including inhabitants of hyperhaline reservoirs. Na<sup>+</sup> content in <i>Dunaliella</i> cells inhabiting saline environments is maintained at a fairly low level, comparable to that in the cells of freshwater organisms. However, despite a long history of studying the physiological and molecular mechanisms that ensure the ability of halotolerant <i>Dunaliella</i> species to survive at high concentrations of NaCl, the question of how <i>Dunaliella</i> cells remove excess Na<sup>+</sup> ions entering from the environment is still debatable. For thermodynamic reasons it should be a primary active mechanism; for example, via a Na<sup>+</sup>-transporting ATPase, but the molecular identification of Na<sup>+</sup>-transporting mechanism in <i>Dunaliella</i> has not yet been carried out. Formerly, in the euryhaline alga <i>D. maritima</i>, we functionally identified Na<sup>+</sup>-transporting P-type ATPase in experiments with plasma membrane (PM) vesicles which were isolated from this alga. Here we describe the cloning of two putative P-type ATPases from <i>D. maritima</i>, <i>Dm</i>HA1 and <i>Dm</i>HA2. Phylogenetic analysis showed that both ATPases belong to the clade of proton P-type ATPases, but the similarity between <i>Dm</i>HA1 and <i>Dm</i>HA2 is not high. The expression of <i>Dm</i>HA1 and <i>Dm</i>HA2 in <i>D. maritima</i> cells under hyperosmotic salt shock was studied by qRT-PCR. Expression of <i>DmHA1</i> gene decreases and remains at a relatively low level during the response of <i>D. maritima</i> cells to hyperosmotic salt shock. In contrast, expression of <i>DmHA2</i> increases under hyperosmotic salt shock. This indicates that <i>Dm</i>HA2 is important for overcoming hyperosmotic salt stress by the algal cells and as an ATPase it is likely directly involved in transport of Na<sup>+</sup> ions. We assume that it is the <i>Dm</i>HA2 ATPase that represents the Na<sup>+</sup>-transporting ATPase.https://www.mdpi.com/2223-7747/10/12/2667<i>Dunaliella</i>cloningexpressionH<sup>+</sup>-ATPasemicroalgaeNa<sup>+</sup>-ATPase |
| spellingShingle | Dmitrii A. Matalin Dmitrii E. Khramov Alexey V. Shuvalov Vadim S. Volkov Yurii V. Balnokin Larissa G. Popova Cloning and Characterization of Two Putative P-Type ATPases from the Marine Microalga <i>Dunaliella maritima</i> Similar to Plant H<sup>+</sup>-ATPases and Their Gene Expression Analysis under Conditions of Hyperosmotic Salt Shock Plants <i>Dunaliella</i> cloning expression H<sup>+</sup>-ATPase microalgae Na<sup>+</sup>-ATPase |
| title | Cloning and Characterization of Two Putative P-Type ATPases from the Marine Microalga <i>Dunaliella maritima</i> Similar to Plant H<sup>+</sup>-ATPases and Their Gene Expression Analysis under Conditions of Hyperosmotic Salt Shock |
| title_full | Cloning and Characterization of Two Putative P-Type ATPases from the Marine Microalga <i>Dunaliella maritima</i> Similar to Plant H<sup>+</sup>-ATPases and Their Gene Expression Analysis under Conditions of Hyperosmotic Salt Shock |
| title_fullStr | Cloning and Characterization of Two Putative P-Type ATPases from the Marine Microalga <i>Dunaliella maritima</i> Similar to Plant H<sup>+</sup>-ATPases and Their Gene Expression Analysis under Conditions of Hyperosmotic Salt Shock |
| title_full_unstemmed | Cloning and Characterization of Two Putative P-Type ATPases from the Marine Microalga <i>Dunaliella maritima</i> Similar to Plant H<sup>+</sup>-ATPases and Their Gene Expression Analysis under Conditions of Hyperosmotic Salt Shock |
| title_short | Cloning and Characterization of Two Putative P-Type ATPases from the Marine Microalga <i>Dunaliella maritima</i> Similar to Plant H<sup>+</sup>-ATPases and Their Gene Expression Analysis under Conditions of Hyperosmotic Salt Shock |
| title_sort | cloning and characterization of two putative p type atpases from the marine microalga i dunaliella maritima i similar to plant h sup sup atpases and their gene expression analysis under conditions of hyperosmotic salt shock |
| topic | <i>Dunaliella</i> cloning expression H<sup>+</sup>-ATPase microalgae Na<sup>+</sup>-ATPase |
| url | https://www.mdpi.com/2223-7747/10/12/2667 |
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