Transport Regulation

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Ulrike Mathesius - One of the best experts on this subject based on the ideXlab platform.

  • Polar Auxin Transport Regulation in Plant-Microbe Interactions
    Polar Auxin Transport, 2013
    Co-Authors: Liang Pin Jason Ng, Giel E. Van Noorden, Ulrike Mathesius
    Abstract:

    Both symbiotic and pathogenic microorganisms can alter the growth and development of plant hosts. The phytohormone auxin controls cell division, cell enlargement, and organogenesis and is thus a likely target for microorganisms that manipulate plants. Some microorganisms can synthesize auxin in the rhizosphere. Others synthesize specific signals that indirectly alter the plant auxin accumulation by altering auxin Transport. This chapter highlights those plant–microorganism interactions in which auxin Transport is targeted by symbionts and pathogens to manipulate the development of their plant host. The mechanism of auxin Transport Regulation by microorganisms is largely unknown, but possible mechanisms that have been studied in model organisms include the induction of plant flavonoids that indirectly alter auxin Transport during nodulation and the direct targeting of auxin Transporters by nematode effectors.

  • The Ethylene-Insensitive sickle Mutant of Medicago truncatula Shows Altered Auxin Transport Regulation during Nodulation
    Plant Physiology, 2006
    Co-Authors: Joko Prayitno, Barry G Rolfe, Ulrike Mathesius
    Abstract:

    We studied the ethylene-insensitive, hypernodulating mutant, sickle (skl), to investigate the interaction of ethylene with auxin Transport during root nodulation in Medicago truncatula. Grafting experiments demonstrated that hypernodulation in skl is root controlled. Long distance Transport of auxin from shoot to root was reduced by rhizobia after 24 h in wild type but not in skl. Similarly, the ethylene precursor 1-amino cyclopropane-1-carboxylic acid inhibited auxin Transport in wild type but not in skl. Auxin Transport at the nodule initiation zone was significantly reduced by rhizobia after 4 h in both wild type and skl. After 24 h, auxin Transport significantly increased at the nodule initiation zone in skl compared to wild type, accompanied by an increase in the expression of the MtPIN1 and MtPIN2 (pin formed) auxin efflux Transporters. Response assays to different auxins did not show any phenotype that would suggest a defect of auxin uptake in skl. The auxin Transport inhibitor N-1-naphthylphtalamic acid inhibited nodulation in wild type but not skl, even though N-1-naphthylphtalamic acid still inhibited auxin Transport in skl. Our results suggest that ethylene signaling modulates auxin Transport Regulation at certain stages of nodule development, partially through PIN gene expression, and that an increase in auxin Transport relative to the wild type is correlated with higher nodule numbers. We also discuss the Regulation of auxin Transport in skl in comparison to previously published data on the autoRegulation mutant, super numerary nodules (van Noorden et al., 2006).

  • defective long distance auxin Transport Regulation in the medicago truncatula super numeric nodules mutant
    Plant Physiology, 2006
    Co-Authors: Giel E. Van Noorden, Barry G Rolfe, John Ross, James B Reid, Ulrike Mathesius
    Abstract:

    Long-distance auxin Transport was examined in Medicago truncatula and in its supernodulating mutant sunn (super numeric nodules) to investigate the Regulation of auxin Transport during autoRegulation of nodulation (AON). A method was developed to monitor the Transport of auxin from the shoot to the root in whole seedlings. Subsequently, the Transport was monitored after inoculation of roots with the nodulating symbiont Sinorhizobium meliloti. The sunn mutant showed an increased amount of auxin Transported from the shoot to the root compared to the wild type. The auxin Transport capacity of excised root segments was similar in wild type and sunn, suggesting that the difference in long-distance auxin transfer between them is due to loading in the shoot. After inoculation, wild-type seedlings showed decreased auxin loading from the shoot to the root; however, the sunn mutant failed to reduce the amount of auxin loaded. The time of reduced auxin loading correlated with the onset of AON. Quantification of endogenous auxin levels at the site of nodule initiation showed that sunn contained three times more auxin than wild type. Inoculation of sunn failed to reduce the level of auxin within 24 h, as was observed in the wild type. We propose a model for the role of auxin during AON of indeterminate legumes: 1) high levels of endogenous auxin are correlated with increased numbers of nodules, 2) inoculation of roots reduces auxin loading from the shoot to the root, and 3) subsequent reduction of auxin levels in the root inhibits further nodule initiation.

Lei Jiang - One of the best experts on this subject based on the ideXlab platform.

  • Correction: Bioinspired hydrogel-based nanofluidic ionic diodes: nano-confined network tuning and ion Transport Regulation.
    Chemical communications (Cambridge England), 2020
    Co-Authors: Congcong Zhu, Yunfei Teng, Ganhua Xie, Yongchao Qian, Bo Niu, Pei Liu, Weipeng Chen, Xiang-yu Kong, Lei Jiang
    Abstract:

    Correction for 'Bioinspired hydrogel-based nanofluidic ionic diodes: nano-confined network tuning and ion Transport Regulation' by Congcong Zhu et al., Chem. Commun., 2020, 56, 8123-8126, DOI: 10.1039/D0CC01313G.

  • bioinspired hydrogel based nanofluidic ionic diodes nano confined network tuning and ion Transport Regulation
    Chemical Communications, 2020
    Co-Authors: Yunfei Teng, Yongchao Qian, Weipeng Chen, Xiang-yu Kong, Pei Li, Lei Jiang
    Abstract:

    Biological ion channel-based mass Transport and signal transduction play a crucial role in physiological activities, and biomimetic nanochannels in aqueous solutions for ion Transport Regulation have been extensively studied. Few studies on non-aqueous systems, gel-based nanochannels, mainly focus on the charged gel network or embedded electrolytes. However, the basic issue of how a nanoscale gel network affects the ion Transport in nanochannels has been neglected. Here, we demonstrate a non-aqueous biomimetic nanochannel system by employing the agarose hydrogel in conical nanochannels. To tune the hydrogel network by adjusting the gel concentration, the ion Transport behavior in gel-based nanochannels is systemically investigated. The experimental results show that the ion Transport behaviors in gel-nanochannels with 2% gel present similar ion selectivity and rectification performance to the aqueous system, indicating fast investigation of gel-based systems with the knowledge of the extensively studied aqueous systems. Furthermore, a gel-based solid-state diode and logic circuits were fabricated.

  • correction bioinspired hydrogel based nanofluidic ionic diodes nano confined network tuning and ion Transport Regulation
    Chemical Communications, 2020
    Co-Authors: Congcong Zhu, Yunfei Teng, Ganhua Xie, Yongchao Qian, Bo Niu, Pei Liu, Weipeng Chen, Xiang-yu Kong, Lei Jiang, Liping Wen
    Abstract:

    Biological ion channel-based mass Transport and signal transduction play a crucial role in physiological activities, and biomimetic nanochannels in aqueous solutions for ion Transport Regulation have been extensively studied. Few studies on non-aqueous systems, gel-based nanochannels, mainly focus on the charged gel network or embedded electrolytes. However, the basic issue of how a nanoscale gel network affects the ion Transport in nanochannels has been neglected. Here, we demonstrate a non-aqueous biomimetic nanochannel system by employing the agarose hydrogel in conical nanochannels. To tune the hydrogel network by adjusting the gel concentration, the ion Transport behavior in gel-based nanochannels is systemically investigated. The experimental results show that the ion Transport behaviors in gel-nanochannels with 2% gel present similar ion selectivity and rectification performance to the aqueous system, indicating fast investigation of gel-based systems with the knowledge of the extensively studied aqueous systems. Furthermore, a gel-based solid-state diode and logic circuits were fabricated.

  • ion Transport Regulation through triblock copolymer pet asymmetric nanochannel membrane model system establishment and rectification mapping
    Chinese Chemical Letters, 2020
    Co-Authors: Linsen Yang, Xiang-yu Kong, Yuanyuan Zhao, Miaomiao Yuan, Lei Jiang
    Abstract:

    Abstract Controlling ions Transport across the membrane at different pH environments is essential for the physiological process and artificial systems. Many efforts have been devoted to pH-responsive ion gating, while rarely systems can maintain the rectification in pH-changing environments. Here, a composite nanochannel system is fabricated, which shows unidirectional rectification with high performance in a wide pH range. In the system, block copolymer (BCP) and polyethylene terephthalate (PET) are employed for the amphoteric nanochannels fabrication. Based on the composite system, a model is built for the theoretical simulation. Thereafter, rectification mapping is conducted on the system, which can provide abundant information about the relations between charge distribution and ions Transport properties. The proposed rectification mapping can definitely help to design new materials with special ion Transport properties, such as high-performance membranes used in the salinity gradient power generation field.

Larry Gerace - One of the best experts on this subject based on the ideXlab platform.

  • Molecular trafficking across the nuclear pore complex.
    Current Opinion in Cell Biology, 1992
    Co-Authors: Larry Gerace
    Abstract:

    The nuclear pore complex is the gateway for protein and RNA Transport between the cytoplasm and nucleus. Recent work has characterized signals and components involved in nuclear import of macromolecules and has described mechanisms for Transport Regulation. Advances in understanding the structure of the pore complex are starting to provide a framework for interpreting the biochemistry of nuclear import. Information on the export of RNA from the nucleus is only beginning to emerge.

Qing Yang - One of the best experts on this subject based on the ideXlab platform.

  • three dimensional architecture of the isolated yeast nuclear pore complex functional and evolutionary implications
    Molecular Cell, 1998
    Co-Authors: Michael P. Rout, Qing Yang, Christopher W. Akey
    Abstract:

    We have calculated a three-dimensional map of the yeast nuclear pore complex (yNPC) from frozen-hydrated specimens, thereby providing a direct comparison with the vertebrate NPC. Overall, the smaller yNPC is comprised of an octagonal inner spoke ring that is anchored within the nuclear envelope by a novel membrane-interacting ring. In addition, a cylindrical Transporter is located centrally within the spokes and exhibits a variable radial expansion in projection that may reflect gating. The inner spoke ring, a transmembrane spoke domain, and the Transporter are conserved between yeast and vertebrates; hence, they are required to form a functional NPC. However, significant alterations in NPC architecture have arisen during evolution that may be correlated with differences in nuclear Transport Regulation or mitotic behavior.

Yunfei Teng - One of the best experts on this subject based on the ideXlab platform.

  • Correction: Bioinspired hydrogel-based nanofluidic ionic diodes: nano-confined network tuning and ion Transport Regulation.
    Chemical communications (Cambridge England), 2020
    Co-Authors: Congcong Zhu, Yunfei Teng, Ganhua Xie, Yongchao Qian, Bo Niu, Pei Liu, Weipeng Chen, Xiang-yu Kong, Lei Jiang
    Abstract:

    Correction for 'Bioinspired hydrogel-based nanofluidic ionic diodes: nano-confined network tuning and ion Transport Regulation' by Congcong Zhu et al., Chem. Commun., 2020, 56, 8123-8126, DOI: 10.1039/D0CC01313G.

  • bioinspired hydrogel based nanofluidic ionic diodes nano confined network tuning and ion Transport Regulation
    Chemical Communications, 2020
    Co-Authors: Yunfei Teng, Yongchao Qian, Weipeng Chen, Xiang-yu Kong, Pei Li, Lei Jiang
    Abstract:

    Biological ion channel-based mass Transport and signal transduction play a crucial role in physiological activities, and biomimetic nanochannels in aqueous solutions for ion Transport Regulation have been extensively studied. Few studies on non-aqueous systems, gel-based nanochannels, mainly focus on the charged gel network or embedded electrolytes. However, the basic issue of how a nanoscale gel network affects the ion Transport in nanochannels has been neglected. Here, we demonstrate a non-aqueous biomimetic nanochannel system by employing the agarose hydrogel in conical nanochannels. To tune the hydrogel network by adjusting the gel concentration, the ion Transport behavior in gel-based nanochannels is systemically investigated. The experimental results show that the ion Transport behaviors in gel-nanochannels with 2% gel present similar ion selectivity and rectification performance to the aqueous system, indicating fast investigation of gel-based systems with the knowledge of the extensively studied aqueous systems. Furthermore, a gel-based solid-state diode and logic circuits were fabricated.

  • correction bioinspired hydrogel based nanofluidic ionic diodes nano confined network tuning and ion Transport Regulation
    Chemical Communications, 2020
    Co-Authors: Congcong Zhu, Yunfei Teng, Ganhua Xie, Yongchao Qian, Bo Niu, Pei Liu, Weipeng Chen, Xiang-yu Kong, Lei Jiang, Liping Wen
    Abstract:

    Biological ion channel-based mass Transport and signal transduction play a crucial role in physiological activities, and biomimetic nanochannels in aqueous solutions for ion Transport Regulation have been extensively studied. Few studies on non-aqueous systems, gel-based nanochannels, mainly focus on the charged gel network or embedded electrolytes. However, the basic issue of how a nanoscale gel network affects the ion Transport in nanochannels has been neglected. Here, we demonstrate a non-aqueous biomimetic nanochannel system by employing the agarose hydrogel in conical nanochannels. To tune the hydrogel network by adjusting the gel concentration, the ion Transport behavior in gel-based nanochannels is systemically investigated. The experimental results show that the ion Transport behaviors in gel-nanochannels with 2% gel present similar ion selectivity and rectification performance to the aqueous system, indicating fast investigation of gel-based systems with the knowledge of the extensively studied aqueous systems. Furthermore, a gel-based solid-state diode and logic circuits were fabricated.