manganese containing modified residue calcium containing modified residue L-alaninato bis-L-aspartato tris-L-glutamato L-histidino calcium tetramanganese pentoxide 1175.9228515625 1176.52001953125 333.64239501953125 333.779998779296875 MOD:01955 H -6 O 5 Ca 1 Mn 4 PSI-MOD Cross-link 7. mu2-alaninato-1kappaO(1),3kappaO(1')-mu2-aspartato-1kappaO(4),5kappaO(4')-mu2-aspartato-2kappaO(4),3kappaO(4')-mu2-glutamato-3kappaO(5),4kappaO(5')-mu2-glutamato-4kappaO(5),5kappaO(5')-mu-glutamato-2kappaO(5)-mu-histidino-2kappaN(tau)-mu4-oxido-1:2:4:5kappa(4)O-tri-mu3-oxido-1:2:3kappa(3)O;1:3:4kappa(3)O;2:3:4kappa(3)O;mu-oxido-4:5kappa(2)O-calciumtetramanganese photosystem II catalytic cluster 4Mn-Ca-5O cluster A, D, D, E, E, E, H natural L-alaninato bis-L-aspartato tris-L-glutamato L-histidino calcium tetramanganese pentoxide C-term C 32 H 38 N 9 O 23 Ca 1 Mn 4 modification from RESID metal or metal cluster coordinated L-alanine residue metal or metal cluster coordinated L-aspartic acid residue metal or metal cluster coordinated L-glutamic acid residue metal or metal cluster coordinated L-histidine residue