Environmental Microbiology of Aquatic and Waste Systems

4.1 Taxonomy of Microorganisms in Aquatic Environments 67

N N

N

O

COOCH 3

CO-Phytyl

Chlorophyll d

N

Mg

N N

N

O

O

COOCH 3

COOCH 3

CO-Phytyl

Chlorophyll b

Chlorophyll a

Bacteriochlorophyll b

Bacteriochlorophyll g Zn-Bacteriochlorophyll a

Bacteriochlorophylls c,d,e

N

Mg

N N

N

COOCHO

COOH^3

CO-Phytyl

CO-Phytyl

CO-Farnesyl

CO-Farnesyl

Chlorophylls c

N

Mg

Mg

Mg Mg

N

32

31

(^378)
12
131
133 134
132
172
171
173
P P 3
2
P^1
P^17 P^18
P^7 P^11 P^15 P
16
P^19 P^20
R^2
R^1
R^2
R^1
17
20
O
O
O
O
O O
O
O
O
OO
NN
N N
N N
N
Mg
Mg
N
N
N
N
N
OH
N
N
N
N
N
N
N
Zn
N
N
N
N
CHO CHO
COOCH 3
COOCH 3
COOCH 3
COOCH 3
O
R^3
R^4
Bacteriochlorophyll a
a
b
Fig. 4.12 Structure of chlorophylls and bacteriochlorophylls
(From Encyclopedia of Life Sciences; Fujita 2005. With
permission) Structure of various Chls (a) and BChls (b). (a) Chls
a, b, c and d. Differences in side­chains of Chls b, c and d from
Chl a are highlighted with yellow boxes. (b) BChls a, b, c, d, e, g
and Zn­BChl a. Differences in sidechains, ring oxidation state,
and the central metal ion of BChls b, c, d, e, g and Zn­BChl a are
highlighted with yellow boxes.