Читать книгу Molecular Mechanisms of Photosynthesis - Robert E. Blankenship - Страница 69

Bacteriochlorophyll g is found only in the anoxygenic heliobacteria. Its structure is shown in Fig. 4.4. It is essentially a molecular hybrid of chlorophyll a and bacteriochlorophyll b, in that it contains the C‐3 vinyl substituent of chlorophyll a and the C‐8 exocyclic ethylidine substituent of bacteriochlorophyll b. It also contains a farnesyl tail instead of phytyl. Bacteriochlorophyll g is very unstable and isomerizes into chlorophyll a or closely related compounds.