Words similar to lhcp
Example sentences for: lhcp
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Import of a mutant LHCP into isolated chloroplasts was nearly abolished when His within the motif was substituted with Ala [ 28 ] . Association of Chl with this motif, therefore, appears essential for continuation of the proteins on the pathway of assembly of an LHC.
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.
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.
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.
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.
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