Decay kinetics of tyrosine radical (YZ*) in chloride anion-depleted photosystem 2 studied by time-resolved EPR

Title:

Decay kinetics of tyrosine radical (YZ*) in chloride anion-depleted photosystem 2 studied by time-resolved EPR

Creator:

Jajoo, A., Bharti, S., and Kawamori, A.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:00835988-2210-46b8-a4d0-749c93b1d9aa
uuid:00835988-2210-46b8-a4d0-749c93b1d9aa
issn:0300-3604
doi:10.1023/B:PHOT.0000040570.39971.63

Subject:

bicarbonate, bromide, EPR, fluoride, iodide, nitrate, phosphate, photosystem 2, spinach, tyrosine radical, and sulphate

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

The decay of tyrosine cation radical was found to be biphasic at 253 K. The fast phase corresponds to the YZ* component while the slow phase corresponds to the tyrosine D radical (YD*) component. At 253 K, the t1/2 value was ∼28.6 s for the fast phase and ∼190.7 s for the slow phase. The fast phase is attributed to the recombination of charges between YZ* and QA-. The activation energy for the reaction of YZ with QA- between 253 and 293 K was 48 kJ mol-1 in Cl--depleted photosystem 2 (PS2) membranes. Both the decay rate and the amplitude of the PAR-induced signal of YZ* were affected by addition of chloride anion. Change in the decay rate and the amplitude of the PAR-induced signal of YZ* was observed when other anions like Br-, I-, F, HCO3-, NO3-, PO43- were substituted in the Cl--depleted PS2. and A. Jajoo, S. Bharti, A. Kawamori.

Language:

Multiple languages

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Coverage:

59-64

Source:

Photosynthetica | 2004 Volume:42 | Number:1

Harvested from:

CDK

Metadata only:

false