Aquaporins and membrane diffusion of CO2 in living organisms

Kaldenhoff, Ralf; Lou, Kai; Uehlein, Norbert

doi:10.1016/j.bbagen.2013.09.037

Cited by 110 publications

(75 citation statements)

References 42 publications

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“…In fact, such a low g chl would be somewhat suboptimal for photosynthesis, and engineering plants with a higher g chl may allow for a greater enhancement of photosynthesis compared with introducing a bypass. However, it is possible that the biochemical composition of the chloroplast envelope prevents such highly permeable chloroplast envelopes (Kaldenhoff et al, 2014). Our findings highlight the need to obtain more reliable estimates for the permeability of chloroplast membranes to CO 2 .…”

Section: How Can the Effect Of A Photorespiratory Bypass Be Increased?mentioning

confidence: 80%

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The Benefits of Photorespiratory Bypasses: How Can They Work?

et al. 2014

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Bypassing the photorespiratory pathway is regarded as a way to increase carbon assimilation and, correspondingly, biomass production in C 3 crops. Here, the benefits of three published photorespiratory bypass strategies are systemically explored using a systems-modeling approach. Our analysis shows that full decarboxylation of glycolate during photorespiration would decrease photosynthesis, because a large amount of the released CO 2 escapes back to the atmosphere. Furthermore, we show that photosynthesis can be enhanced by lowering the energy demands of photorespiration and by relocating photorespiratory CO 2 release into the chloroplasts. The conductance of the chloroplast membranes to CO 2 is a key feature determining the benefit of the relocation of photorespiratory CO 2 release. Although our results indicate that the benefit of photorespiratory bypasses can be improved by increasing sedoheptulose bisphosphatase activity and/or increasing the flux through the bypass, the effectiveness of such approaches depends on the complex regulation between photorespiration and other metabolic pathways.

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Section: How Can the Effect Of A Photorespiratory Bypass Be Increased?mentioning

confidence: 80%

“…about 4 orders of magnitude; Evans et al, 2009;Kaldenhoff et al, 2014). As explained by Tholen et al (2012aTholen et al ( , 2012b, estimates of the effective in vivo resistances are not only a result of the membrane permeability itself but also take into account the structural arrangement of the organelles in the cell.…”

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confidence: 99%

The Benefits of Photorespiratory Bypasses: How Can They Work?

et al. 2014

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“…There is also a similar debate in the plant AQP field on whether AQPs might contribute to regulating CO2 levels for photosynthesis [121]. A recent review dedicated to AQPs and CO2 permeability of biological membranes [122] concluded that "the debate about the mechanism of membrane CO2 diffusion continues and it is difficult to draw general conclusions". This is still very much an open question.…”

Section: Carbon Dioxide Transportmentioning

confidence: 99%

Beyond water homeostasis: Diverse functional roles of mammalian aquaporins

Kitchen

Day

Salman

et al. 2015

Biochimica et Biophysica Acta (BBA) - General Subjects

128

115

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BACKGROUND: Aquaporin (AQP) water channels are best known as passive transporters of water that are vital for water homeostasis. SCOPE OF REVIEW:AQP knockout studies in whole animals and cultured cells, along with naturally occurring human mutations suggest that the transport of neutral solutes through AQPs has important physiological roles. Emerging biophysical evidence suggests that AQPs may also facilitate gas (CO2) and cation transport. AQPs may be involved in cell signalling for volume regulation and controlling the subcellular localization of other proteins by forming macromolecular complexes. This review examines the evidence for these diverse functions of AQPs as well their physiological relevance. MAJOR CONCLUSIONS:As well as being crucial for water homeostasis, AQPs are involved in physiologically important transport of molecules other than water, regulation of surface expression of other membrane proteins, cell adhesion, and signalling in cell volume regulation. GENERAL SIGNIFICANCE:Elucidating the full range of functional roles of AQPs beyond the passive conduction of water will improve our understanding of mammalian physiology in health and disease. The functional variety of AQPs makes them an exciting drug target and could provide routes to a range of novel therapies.3

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“…Since the discovery of the first water channel, several plant aquaporins have been shown to represent important membrane-selective pathway for small uncharged solutes, including glycerol, urea, ammonia, carbon dioxide, hydrogen peroxide, and the metalloids boric acid, silicic acid, and arsenite, making aquaporins multifunctional channels with important roles not only in water homeostasis, but also in plant metabolism, nutrition, and signaling processes. This important aspect of plant aquaporin multifunctionality has been summarized in recent reviews and will not be addressed in this Update Maurel et al, 2008;Gomes et al, 2009;Hachez and Chaumont, 2010;Ma, 2010;Miwa and Fujiwara, 2010;Bienert and Chaumont, 2013;Kaldenhoff et al, 2013). This Update will focus on the latest breakthroughs regarding function and regulation of aquaporins that facilitate water diffusion across membranes (mostly PIPs and TIPs) and on their involvement in plant growth and water relations in roots and shoots.…”

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confidence: 99%

Aquaporins: Highly Regulated Channels Controlling Plant Water Relations

2014

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Plant growth and development are dependent on tight regulation of water movement. Water diffusion across cell membranes is facilitated by aquaporins that provide plants with the means to rapidly and reversibly modify water permeability. This is done by changing aquaporin density and activity in the membrane, including posttranslational modifications and protein interaction that act on their trafficking and gating. At the whole organ level aquaporins modify water conductance and gradients at key "gatekeeper" cell layers that impact on whole plant water flow and plant water potential. In this way they may act in concert with stomatal regulation to determine the degree of isohydry/anisohydry. Molecular, physiological, and biophysical approaches have demonstrated that variations in root and leaf hydraulic conductivity can be accounted for by aquaporins but this must be integrated with anatomical considerations. This Update integrates these data and emphasizes the central role played by aquaporins in regulating plant water relations.

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Aquaporins and membrane diffusion of CO2 in living organisms

Cited by 110 publications

References 42 publications

The Benefits of Photorespiratory Bypasses: How Can They Work?

The Benefits of Photorespiratory Bypasses: How Can They Work?

Beyond water homeostasis: Diverse functional roles of mammalian aquaporins

Aquaporins: Highly Regulated Channels Controlling Plant Water Relations

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