Smart polymer-based calcium-ion self-regulated nanochannels by mimicking the biological Ca2+-induced Ca2+ release process
发布时间：2019-11-01
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- 论文类型：
- 期刊论文
- 发表时间：
- 2019-08-30
- 发表刊物：
- NPG ASIA MATERIALS
- 收录刊物：
- EI、SCIE
- 文献类型：
- J
- 卷号：
- 11
- 期号：
- 1
- ISSN号：
- 1884-4049
- 摘要：
- In nature, ion channels play key roles in controlling ion transport between cells and their surroundings. Calcium ion (Ca2+)-induced Ca2+ release (CICR), a critical control mechanism for Ca2+ channels, occurs due to a Ca2+ concentration gradient working in synergy with ryanodine receptors, which are famously known as "calcium sparks". Inspired by this self-regulated biological process, a smart Ca2+ concentration-modulated nanochannel system was developed by integrating a poly{N-isopropylacrylamide-co-acrylamide-[4-(trifluoromethyl) phenyl]-2-thiourea(0.2)-co-acrylamideDDDEEKC(0.2)} (denoted as PNI-co-CF3-PT0.2-co-DDDEEKC0.2) three-component copolymer onto the nanochannels of a porous anodic alumina (PAA) membrane. In this smart polymer design, the DDDEEKC hepta-peptide unit has an extraordinary binding affinity with Ca2+ through coordination bonds, while CF3-PT functions as a hydrogen bond mediation unit, facilitating the remarkable conformational transition of the PNI main chain in response to Ca2+-specific adsorption. Due to these futures, the dynamic gating behaviors of the modified nanochannels could be precisely manipulated by the Ca(2+)concentration. In addition, the sensitive Ca2+ response, as low as 10 pM with a high specificity toward Ca2+ capable of discriminating Ca2+ from other potential interference metal ions (e.g., K+, Cu2+, Mg2+, Zn2+, Fe3+, and Al3+), remarkable morphological change in the nanochannel and satisfactory reversibility indicate the great potential of Ca2+-responsive polymers for the fabrication of biodevices and artificial nanochannels.
- 第一作者
- Li, Yunlong
- 合写作者
- Chang, Baisong,Qin, Haijuan,Liu, Jinxuan,Chen, Zhixiang,Wang, Cunli,Wang, Dongdong,Li, Xiuling,Qing, Guangyan,Xiong, Yuting
- 通讯作者
- Qing, GY (reprint author), Chinese Acad Sci, Dalian Inst Chem Phys, Key Lab Separat Sci Analyt Chem, 457 Zhongshan Rd, Dalian 116023, Peoples R China.