Long-Range Electron Tunneling from the Primary to Secondary Quinones in Photosystem II Enhanced by Hydrogen Bonds with a Nonheme Fe Complex

2021 ◽  
Author(s):  
Hiroyuki Tamura ◽  
Keisuke Saito ◽  
Hiroshi Ishikita
Keyword(s):  
Photosystem Ii ◽  
Hydrogen Bonds ◽  
Long Range ◽  
Electron Tunneling ◽  
Fe Complex

scholarly journals Structural Changes in the Acceptor Site of Photosystem II upon Ca2+/Sr2+ Exchange in the Mn4CaO5 Cluster Site and the Possible Long-Range Interactions

Biomolecules ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 371
Author(s):  
Koua
Keyword(s):  
Crystal Structure ◽  
Photosystem Ii ◽  
Long Range ◽  
Electron Acceptor ◽  
Structural Changes ◽  
Acceptor Site ◽  
Oxygen Evolving Complex ◽  
Long Range Interactions ◽  
Structural Perturbations ◽  
Oxygen Evolving

The Mn4CaO5 cluster site in the oxygen-evolving complex (OEC) of photosystem II (PSII) undergoes structural perturbations, such as those induced by Ca2+/Sr2+ exchanges or Ca/Mn removal. These changes have been known to induce long-range positive shifts (between +30 and +150 mV) in the redox potential of the primary quinone electron acceptor plastoquinone A (QA), which is located 40 Å from the OEC. To further investigate these effects, we reanalyzed the crystal structure of Sr-PSII resolved at 2.1 Å and compared it with the native Ca-PSII resolved at 1.9 Å. Here, we focus on the acceptor site and report the possible long-range interactions between the donor, Mn4Ca(Sr)O5 cluster, and acceptor sites.

Long-range intervalence electron tunneling through fully saturated systems

1982 ◽  
Vol 104 (9) ◽  
pp. 2596-2599 ◽  
Author(s):  
C. A. Stein ◽  
Nita A. Lewis ◽  
Gunther Seitz
Keyword(s):  
Long Range ◽  
Electron Tunneling

scholarly journals Plastocyanin is the long-range electron carrier between photosystem II and photosystem I in plants

2020 ◽  
Vol 117 (26) ◽  
pp. 15354-15362 ◽  
Author(s):  
Ricarda Höhner ◽  
Mathias Pribil ◽  
Miroslava Herbstová ◽  
Laura Susanna Lopez ◽  
Hans-Henning Kunz ◽  
...  
Keyword(s):  
Electron Transport ◽  
Photosystem Ii ◽  
Long Range ◽  
Narrow Range ◽  
Higher Plants ◽  
Regulatory Element ◽  
Photosynthetic Electron Transport ◽  
Electron Carrier ◽  
Mobile Electron ◽  
Electron Carriers

In photosynthetic electron transport, large multiprotein complexes are connected by small diffusible electron carriers, the mobility of which is challenged by macromolecular crowding. For thylakoid membranes of higher plants, a long-standing question has been which of the two mobile electron carriers, plastoquinone or plastocyanin, mediates electron transport from stacked grana thylakoids where photosystem II (PSII) is localized to distant unstacked regions of the thylakoids that harbor PSI. Here, we confirm that plastocyanin is the long-range electron carrier by employing mutants with different grana diameters. Furthermore, our results explain why higher plants have a narrow range of grana diameters since a larger diffusion distance for plastocyanin would jeopardize the efficiency of electron transport. In the light of recent findings that the lumen of thylakoids, which forms the diffusion space of plastocyanin, undergoes dynamic swelling/shrinkage, this study demonstrates that plastocyanin diffusion is a crucial regulatory element of plant photosynthetic electron transport.

Optical resonance identification of long-range electron tunneling between superlattice levels in an electric field

2013 ◽  
Vol 47 (1) ◽  
pp. 63-65 ◽  
Author(s):  
A. A. Andronov ◽  
E. P. Dodin ◽  
D. I. Zinchenko ◽  
Yu. N. Nozdrin
Keyword(s):  
Electric Field ◽  
Long Range ◽  
Electron Tunneling ◽  
Optical Resonance

Promoting helicity in carbohydrate-containing foldamers through long-range hydrogen bonds

2007 ◽  
pp. 831-833 ◽  
Author(s):  
David Rodríguez-Lucena ◽  
Juan M. Benito ◽  
Carmen Ortiz Mellet ◽  
José M. García Fernández
Keyword(s):  
Hydrogen Bonds ◽  
Long Range

scholarly journals An Uneven Chain-like Ferromagnetic Copper(II) Coordination Polymer Displaying Metamagnetic Behavior and Long-Range Magnetic Ordering

2021 ◽  
Vol 8 (1) ◽  
pp. 2
Author(s):  
Cai-Ming Liu ◽  
You Song
Keyword(s):  
Molecular Structure ◽  
Coordination Polymer ◽  
Hydrogen Bonds ◽  
Long Range ◽  
Three Dimensional ◽  
Magnetic Ordering ◽  
Antiferromagnetic Interaction ◽  
Ferromagnetic Coupling ◽  
One Dimensional ◽  
1D Chain

Ferromagnetic coupling exists in an uneven chain-like copper(II) complex with both end-on azido and syn-syn carboxylato bridges, (Cu3(L)2(N3)4(H2O)3)n (1, HL = 6-hydroxynicotinic acid). It is the first example of one-dimensional (1D) chain-like copper(II) coordination polymer showing both metamagnetic behavior and long-range magnetic ordering (Tc = 6.7 K), thanks to the interchain hydrogen bonds, which make a three-dimensional (3D) supramolecular array of the entire molecular structure and mediate the interchain antiferromagnetic interaction.

Sign in / Sign up

Export Citation Format

Share Document