Jjj

Thylakoid lumen

2H2O

FIGURE 22.19 • The molecular architecture of PSII. The core of the PSII complex consists of the two polypeptides (D1 and D2) that bind P680, pheophytin (Pheo), and the quinones, QA and QB. Additional components of this complex include cytochrome b559, two additional intrinsic proteins (47 and 43 kD) that serve an accessory light-harvesting function, and an extrinsic protein complex that is essential to O2 evolution.

FIGURE 22.20 • The molecular architecture of PSI. PsaA and PsaB constitute the reaction center dimer, an integral membrane complex; P700 is located at the lumenal side of this dimer. PsaC, which bears Fe-S centers FA and Fb, and PsaD, the interaction site for ferre-doxin, are on the stromal side of the thylakoid membrane. PsaF, which provides the plasto-cyanin interaction site, is on the lumenal side. (Adapted from Golbeck, J. H, 1992. Annual Review of Plant Physiology and Plant Molecular Biology 43:293-324.)

FIGURE 22.20 • The molecular architecture of PSI. PsaA and PsaB constitute the reaction center dimer, an integral membrane complex; P700 is located at the lumenal side of this dimer. PsaC, which bears Fe-S centers FA and Fb, and PsaD, the interaction site for ferre-doxin, are on the stromal side of the thylakoid membrane. PsaF, which provides the plasto-cyanin interaction site, is on the lumenal side. (Adapted from Golbeck, J. H, 1992. Annual Review of Plant Physiology and Plant Molecular Biology 43:293-324.)

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