A PHP Error was encountered

Severity: Warning

Message: file_get_contents(https://...@pubfacts.com&api_key=b8daa3ad693db53b1410957c26c9a51b4908&a=1): Failed to open stream: HTTP request failed! HTTP/1.1 429 Too Many Requests

Filename: helpers/my_audit_helper.php

Line Number: 176

Backtrace:

File: /var/www/html/application/helpers/my_audit_helper.php
Line: 176
Function: file_get_contents

File: /var/www/html/application/helpers/my_audit_helper.php
Line: 250
Function: simplexml_load_file_from_url

File: /var/www/html/application/helpers/my_audit_helper.php
Line: 3122
Function: getPubMedXML

File: /var/www/html/application/controllers/Detail.php
Line: 575
Function: pubMedSearch_Global

File: /var/www/html/application/controllers/Detail.php
Line: 489
Function: pubMedGetRelatedKeyword

File: /var/www/html/index.php
Line: 316
Function: require_once

Critical evaluation of electron transfer kinetics in P-F/F, P-F, and P-A Photosystem I core complexes in liquid and in trehalose glass. | LitMetric

Critical evaluation of electron transfer kinetics in P-F/F, P-F, and P-A Photosystem I core complexes in liquid and in trehalose glass.

Biochim Biophys Acta Bioenerg

Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA, USA; Department of Chemistry, The Pennsylvania State University, University Park, PA, USA. Electronic address:

Published: December 2018

This work aims to fully elucidate the effects of a trehalose glassy matrix on electron transfer reactions in cyanobacterial Photosystem I (PS I). Forward and backward electron transfer rates from A and A to F and charge recombination rates from A, A, A, F, and [F/F] to P were measured in P-F/F complexes, P-F cores, and P-A cores, both in liquid and in a trehalose glassy matrix at 11% humidity. By comparing CONTIN-resolved kinetic events over 6 orders of time in increasingly simplified versions of PS I at 480 nm, a wavelength that reports primarily A/A oxidation, and over 9 orders of time at 830 nm, a wavelength that reports P reduction and A oxidation, assignments could be made for nearly all of the resolved kinetic phases. Trehalose-embedded PS I samples demonstrated partially arrested forward electron transfer. The fractions of complexes in which electron transfer did not proceed beyond A, A and F were 53%, 16% and 22%, respectively, with only 10% of electrons reaching the terminal F/F clusters. The ~10 μs and ~150 μs components in both liquid and trehalose-embedded PS I were assigned to recombination between A and P and between A and P, respectively. The kinetics and amplitudes of these resolved kinetic phases in liquid and trehalose-embedded PS I samples could be well-fitted by a kinetic model that allowed us to calculate the asymmetrical contribution of the A and A quinones to the electrochromic signal at 480 nm. Possible reasons for these effects are discussed.

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.bbabio.2018.09.367DOI Listing

Publication Analysis

Top Keywords

electron transfer
20
liquid trehalose
8
trehalose glassy
8
glassy matrix
8
orders time
8
wavelength reports
8
resolved kinetic
8
kinetic phases
8
trehalose-embedded samples
8
liquid trehalose-embedded
8

Similar Publications

Want AI Summaries of new PubMed Abstracts delivered to your In-box?

Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!