园艺-分子生物合辑Horticulture — Genetics · Breeding
|Nodulin 26-like intrinsic protein CsNIP2;2 is a silicon influx transporter in Cucumis sativus L.
|DUAN Yao-ke1, SU Yan1, HAN Rong1, SUN Hao1, 2, GONG Hai-jun1
|1 Shaanxi Engineering Research Center for Vegetables/College of Horticulture, Northwest A&F University, Yangling 712100, P.R.China
2 Henan Key Laboratory of Ion-Beam Bioengineering, School of Agricultural Sciences, Zhengzhou University, Zhengzhou 450000, P.R.China
Nodulin 26-like intrinsic proteins (NIPs)是一类跨膜蛋白，主要介导水和其他小分子的跨膜运输。NIP中的一类能够介导硅的跨膜运输，这一类NIP通常具有由甘氨酸、丝氨酸、甘氨酸和精氨酸构成的选择性滤器。黄瓜是消费广泛的蔬菜之一，目前对黄瓜中大部分NIP的功能仍不太清楚。该研究发现CsNIP2;2是CsNIP2;1的串联重复基因，而CsNIP2;1已经证明是一种硅内向转运基因。CsNIP2;2具有由半胱氨酸、丝氨酸、甘氨酸和精氨酸组成的选择性过滤器，它不同于目前高等植物中已经验证功能的硅内向转运蛋白。注射CsNIP2;2 cRNA的非洲爪蟾卵母细胞中硅的吸收量高于对照组，且对硅的吸收不受低温的影响。CsNIP2;2在黄瓜根、茎、叶片和叶柄中均有表达，外源硅处理降低其在茎中的表达，但在其他组织中表达不变。CsNIP2;2-eGFP融合序列在洋葱表皮细胞的瞬时表达表明，CsNIP2;2定位于细胞核、质膜和细胞内未知结构。该研究表明CsNIP2;2是黄瓜中的硅内向转运蛋白，其亚细胞定位和选择性滤器的构成与高等植物中以前发现的硅内向转运蛋白不同。这些发现可能有助于我们更好地了解NIPs在黄瓜中的功能。
Abstract Nodulin 26-like intrinsic proteins (NIPs) are a family of channel-forming transmembrane proteins that function in the transport of water and other small molecules. Some NIPs can mediate silicon transport across plasma membranes and lead to silicon accumulation in plants, which is beneficial for the growth and development of plants. Cucumber is one of the most widely consumed vegetables; however, the functions of NIPs in this crop are still largely unknown. Here, we report the functional characteristics of CsNIP2;2. It was found that CsNIP2;2 is a tandem repeat of CsNIP2;1, which had been demonstrated to be a silicon influx transporter gene. CsNIP2;2 has a selectivity filter composed of cysteine, serine, glycine and arginine (CSGR), which is different from all previously characterized silicon influx transporters in higher plants at the second helix position. Xenopus laevis oocytes injected with CsNIP2;2 cRNA demonstrated a higher uptake of silicon than the control, and the uptake remained unchanged under low temperature. CsNIP2;2 was found to be expressed in the root, stem, lamina and petiole, and exogenous silicon treatment decreased its expression in the stem but not in other tissues. Transient expression of CsNIP2;2-eGFP fusion sequence in onion epidermal cells showed that CsNIP2;2 was localized to the cell nucleus, plasma membrane and an unknown structure inside the cell. The results suggest that CsNIP2;2 is a silicon influx transporter in cucumber, and its subcellular localization and the selectivity filter are different from those of the previously characterized silicon influx transporters in other plants. These findings may be helpful for understanding the functions of NIPs in cucumber plants.
Received: 25 September 2020
Accepted: 21 May 2021
|Fund: This work was supported by the National Key Research and Development Program of China (2018YFD1000800) and the National Natural Science Foundation of China (32072561 and 31772290).
|About author: DUAN Yao-ke, E-mail: email@example.com; Correspondence SUN Hao, Tel: +86-371-67785095, E-mail: firstname.lastname@example.org; GONG Hai-jun, Tel: +86-29-87082613, E-mail: email@example.com
Cite this article:
DUAN Yao-ke, SU Yan HAN Rong, SUN Hao, GONG Hai-jun.
Nodulin 26-like intrinsic protein CsNIP2;2 is a silicon influx transporter in Cucumis sativus L.. Journal of Integrative Agriculture, 21(3): 685-696.
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