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Monospecific antibodies directed against typical domains of type 1, 2, and 3 light-harvesting complex (LHC) II apoproteins have been used (a) to identify these apoproteins on denaturing sodium dodecyl sulfate gels of barley (Hordeum vulgare) thylakoids, (b) to determine their distribution between grana and stroma membranes, and (c) to follow their accumulation during light-induced greening of etioplasts. In addition, we have studied the light-induced assembly of chlorophyll-protein complexes with a native green gel system (K.D. Allen, L.A. Staehelin [1991] Anal Biochem 194: 214-222). Western blot analysis of the three major LHCII apoprotein bands has identified the highest molecular mass band at 27.5 kD as containing the type 2 LHCII apoproteins, the middle band at 26.9 kD as containing the type 1 LHCII apoproteins, and the lowest band at 26.0 kD as containing the type 3 LHCII apoproteins. During light-induced greening of 6-d-old etiolated barley seedlings, the type 1, 2, and 3 LHCII apoproteins accumulate simultaneously and at similar rates but appear somewhat sooner (&lt; 4 h) in thylakoids from apical than from basal (4-8 h) leaf segments. LHCI polypeptides accrue with similar kinetics, whereas the 33-kD oxygen-evolving complex polypeptides can be detected already in the 0-h light samples. During the most rapid phase of thylakoid development (8-24 h), two slightly larger (28.3 and 28.7 kD) type 2 LHCII apoproteins (precursor intermediates?) also accumulate in the thylakoids. No corresponding higher molecular mass forms of type 1 and 3 LHCII apoproteins could be detected. It is interesting that differences are still apparent in the composition of chlorophyll-protein complexes of light-control plants and those of etiolated plants greened for 8 d.

plant physiology

Appearance of Type 1, 2, and 3 Light-Harvesting Complex II and Light-Harvesting Complex I Proteins during Light-Induced Greening of Barley (Hordeum vulgare) Etioplasts