contact us

Participation of the g = 1.9 and g = 1.82 EPR forms of the semiquinone-iron complex, QA-.Fe2+ of photosystem II in the generation of the Q and C thermoluminescence bands, respectively

FEBS letters / v.336 no.2. 1993, pp.352-356

Author : Demeter, S. ; Goussias, C. ; Bernat, G. ; Kovacs, L. ; Petrouleas, V.

Abstract : Following illumination at 200 K, the charge recombination reactions and the origin of the thermoluminescence (TL) bands appearing at about 0 o C (Q band) and +50 o C (C band) in the glow curve were investigated by comparative TL and EPR measurements in DCMU-treated photosystem II particles. Decay half-time measurements carried out at -25 o C and +25 o C, respectively, suggest that the S 2 state (multi-line signal) undergoes charge recombination with the g = 1.9 form of the semiquinone-iron complex, Q A - .Fe 2+ , resulting in the appearance of the Q band, and that the g = 1.82 form of Q A - .Fe 2+ back-reacts with the oxidized tyrosine, Y D + (Signal II s ), accounting for the generation of the C band.

Keyword : Photosystem II . Semiquinone-iron complex . Thermoluminescence . Charge recombination . EPR

Down-modulation of CD4 antigen during programmed cell death in U937 cells

It has been hypothesized that programmed cell death (PCD), an active cell suicide process occur..

PsaL subunit is required for the formation of photosystem I trimers in the cyan..

When membranes of the wild type strain of the cyanobacterium Synechocystis sp. PCC 6803 were so..

Degradation of human apolipoprotein B-100 by apolipoprotein(a)

Human plasma low density lipoproteine (LDL) contain a very high molecular weight protein termed..

The role of calcium in the organization of fibrillin microfibrils

The microfibrillar glycoprotein fibrillin has a multidomain structure which contains forty-thre..

Two Tcp-1-related but highly divergent gene families exist in oat encoding prot..

Tcp-1-related sequences have been isolated from a cDNA library of etiolated 6-day-old oat (Aven..

Human ferritin H-chains can be obtained in non-assembled stable forms which hav..

We found conditions to obtain the Leu-169 rarr; Arg mutant of human ferritin H chain in a stabl..

Analysis of lactase processing in rabbit

The proteolytic processing of rabbit intestinal lactase-phlorizin-hydrolase (LPH) was studied b..

Molecular cloning of a putative homolog of proline/arginine-rich antibacterial ..

Screening of a porcine bone marrow cDNA library with a PCR-derived probe from rabbit LPS-bindin..

The vanadium chloroperoxidase from the fungus, Curvularia inaequalis - Evidenc..

The binding of vanadate to the novel vanadium chloroperoxidase from C. inaequalis was investiga..

Retinal oxidase is identical to aldehyde oxidase

Retinal oxidase (EC and aldehyde oxidase (EC were compared with respect to t..