{Reference Type}: Journal Article {Title}: Positions of Q(A)and Chl(Z)Relative to Tyrosine Y(Z)and Y(D)in Photosystem II Studied by Pulsed EPR. {Author}: Kawamori A;Katsuta N;Mino H;Ishii A;Minagawa J;Ono TA; {Journal}: J Biol Phys {Volume}: 28 {Issue}: 3 {Year}: Sep 2002 {Factor}: 1.56 {DOI}: 10.1023/A:1020312621949 {Abstract}: PELDOR (Pulsed Electron eLectron DOuble Resonance) was applied to determinethe distance of between Y(Z)and Q(A) (-)inY(D)-less mutant of Chlamydomonas reinhardtiiin Tris-treatedand Zn-substituted preparation of photosystem II. The value of distance wasfound to be 34.5 ± 1 Â. A '2+1' electron spin echo method has beenapplied to measure the orientation of the radius-vector RfomY(D)to Chl(Z)in a membrane-oriented photosystem II. The anglebetween Rand the membrane normal nwas determined to be 50 ±5(°), using the distance 29.4 ± 0.5 Â determined in non-orientedPS II.