Words similar to lhcp
Example sentences for: lhcp
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Further understanding of LHC assembly requires a better knowledge of the characteristics of the reaction catalyzed by Chl(ide) a oxidase and whether Chl b is restricted to these complexes because LHCP serves as a specific effector of the oxidation of Chl(ide) a or whether the protein simply provides binding sites for Chl b and prevents its conversion back to Chl a [ 45 ] . The latter appears less likely as a specific effect, because similar ligands should occur in other proteins.
Lhcb6, a minor LHCP, contains Gly instead of Pro at the position analogous to 82 in Lhcb1, thus eliminating the peptide bond carbonyl of Gly as a ligand, but Lhcb6 has a potential ligand for Chl b in Gln83 [ 39 40 ] . These two LHCP sub-species, along with Lhca4 are most affected by the lack of Chl b in vivo [ 5 ] . Lhcb4 (apoprotein of CP29) has Val instead of Pro at 'position 82', and the absence of site a 6 in Lhcb4 may contribute to its drastic reduction in Chl b -less mutants [ 5 8 ] . However, Lhcb2, Lhcb3, Lhca1, Lhca2 and Lhca3 contain the Gly peptide carbonyl as a ligand (each has Pro at 'position 82' [ 40 ] ) but are reduced only slightly, if any, in amount by the lack of Chl b.
Substitution of these amino acids in the sequence of Lhcb1, a major LHCP that can not be detected in Chl b -less plants [ 5 8 ] , would be expected to restore accumulation of the protein with only Chl a.
b and LHCPs accumulated in parallel with no increase in synthesis of total Chl [ 10 ] . These results indicate that photosystem I and II core complex proteins, which are synthesized in the chloroplast, compete effectively with LHCP for small amounts of Chl a made under these conditions, and that Chl b does not accumulate until sufficient Chl a is made to satisfy core complexes.
3. Assuming a relative equilibrium constant of 3.0 for Chl a and 5.0 for Chl b binding to a ligand in LHCP (numerals approximated from data obtained by Tamiaki et al.
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