RED SHIFT OF ABSORPTION MAXIMA IN CHLOROBIINEAE THROUGH ENZYMATIC METHYLATION OF THEIR ANTENNA BACTERIOCHLOROPHYLLS

被引:105
作者
BOBE, FW
PFENNIG, N
SWANSON, KL
SMITH, KM
机构
[1] UNIV CALIF DAVIS,DEPT CHEM,DAVIS,CA 95616
[2] UNIV KONSTANZ,FAK BIOL,W-7750 CONSTANCE 1,GERMANY
关键词
D O I
10.1021/bi00470a012
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The bacteriochlorophyll d producing photosynthetic green sulfur bacteria Chlorobium vibrioforme forma thiosulfatophilum strain NCIB 8327 and C. vibrioforme strain Bl-20 respond to reduced light conditions in culture by performing methylations at the 4- and 5-substituents, for example, converting the 4-Et into 4-n-Pr, 4-i-Bu, and even 4-neoPn. During this process, the absorption maximum in living cells of C. vibrioforme strain Bl-20 red shifts from 714 to about 728 nm. Eventually, the C. vibrioforme forma thiosulfatophilum strain NCIB 8327 culture carries out a δ-methylation to produce the bacteriochlorophylls c (λmax ca. 750 nm); the new UC Davis bacteriochlorophyll c culture is named C. vibrioforme forma thiosulfatophilum strain D. It is possible that the homologation process increases hydrophobic interactions between individual BChl molecules, giving rise to larger aggregates in the antenna system. Alternatively, the additional methyl units attached to the 4-position shift the absolute configuration of the 2-(l-hydroxyethyl) group from pure R in the case of 4-Et to pure S in the case of 4-neoPn, which in turn might determine the size of the in vivo aggregates due to the intrinsic nature of the pigment protein system. It is suggested that the bacteriochlorophylls c from Chloroflexus aurantiacus strain J-10-fl and the bacteriochlorophylls e from Chlorobium phaeovibrioides might have undergone similar meso methylation as a response to external environmental pressure such as low light intensity. © 1990, American Chemical Society. All rights reserved.
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页码:4340 / 4348
页数:9
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