Kinetic analysis of demetalation of bacteriochlorophyll c and e homologs purified from green sulfur photosynthetic bacteria |
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Authors: | Saga Yoshitaka Hirai Yuki Tamiaki Hitoshi |
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Affiliation: | Department of Chemistry, Faculty of Science and Engineering, Kinki University, Higashi-Osaka, Osaka 577-8502, Japan. saga@chem.kindai.ac.jp |
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Abstract: | Substituent-dependent demetalation kinetics of natural bacteriochlorophyll (BChl) c and e homologs purified from two green sulfur photosynthetic bacteria was first studied. Separated BChl e homologs, which possessed a formyl group at the 7-position of their chlorin macrocycles, exhibited a significantly slow removal of central magnesium to free-base bacteriopheophytins in acidic aqueous acetone compared with the corresponding BChl c homologs, which possessed a methyl group at the 7-position. Additional methyl groups at the 8(2)-position of both BChl c and e molecules had little effect on the demetalation kinetics. |
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Keywords: | BChl, bacteriochlorophyll BChllide, bacteriochlorophyllide BPhe, bacteriopheophytin Chl, chlorophyll Chllide, chlorophyllide [E,E], 8,12-diethyl [I,E], 8-isobutyl-12-ethyl [P,E], 8-propyl-12-ethyl |
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