Thylakoid disks

G protein a membrane-bound protein that mediates the action of adenylate cyclase (24.3) grana bodies within tlie chloroplast that contain the thylakoid disks, the site of photosynthesis (22.1) guanine one of the purine bases found in nucleic acids (9.2)... 

Polyclonal antibodies against ChlPK 1 react with three proteins of 34 K, 25 K and 14 K in thylakoids and in PS II particles (Fig. 1, lanes 1 and 2). In PS I particles the 34 K band was barely observed while the 14 K band was absent (Fig.l, lane 3). Purified ChlPK 1 showed mostly a 25 K band with a very weak signal at around 34 K (Fig. 1, lane 4). Our antibody is not monospecific for a control blot without anti ChlPK 1 treatment did not show any band (Fig. 1). However the 25 K band was consistently observed in thylakoids and in subthylakoid particles as well as in purified ChlPK 1, suggesting that ChlPK 1 is homogenously distributed within the thylakoid disk. 

Thylakoid membrane internal membrane system of chloroplasts folded repeatedly into a stack of disks called grana. 

It is obvious that for radiant energy absorbed by any one of the chromophores to be transferred efficiently along the rod toward the core and eventually to the chlorophyll in the thylakoid complex, it is necessary that the hexamer-linker complexes along the rod have appropriate spectral properties. Since all three hexamer disks in some rods may contain only PC, its spectral properties must be appropriately modulated to fulfill the condition for directional energy transfer. In Synechococcus 6301, for example, the spectral properties of the three PC hexamer disks along the rod are indeed modified by their linker polypeptides from the outer end of the rod to the core, as shown here from left to right ... 

CHLOROPHYLL a FLUORESCENCE (77 K) AND ZEAXANTHIN FORMATION IN LEAF DISKS miCOTIANA TABACUH) AND ISOLATED THYLAKOIDS (LACTUCA SATIVA)... 

Thylakoids internal membrane structures of the chloroplast. Under the electron microscope, T. appear as disk-shaped, flattened vesicles, about 600 nm diam. These are arranged in stacks, which are the grana ob-... 

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