Table 1 Assignment of the light-induced signals observed in 3-, 4-, and 5-ALA-labelled thylakoid preparations of duckweed (Fig. 6) to carbon positions of either the Chl a donor or the Phe a acceptor cofactor.

From: Photochemically induced dynamic nuclear polarization NMR on photosystem II: donor cofactor observed in entire plant

Light-induced 13C signal (ppm)

 

Assignments

Comments

191.0

E,w

190 C-13 1 Phe

 

(not observed)

190.6 C-131 Chl

 

172.2

A

173 C-19 Phe

 

166.8

A

170.0 C-19 Chl

 

162.2

A

162.0 C-14 Chl

 

160.7

A

161 C-16 Phe

 

157.4

A

154.0 C-16 Chl

 

156.0

A

155.9 C-1 Chl, 156 C-6 Phe

 

154.3

A

154.4 C-6 Chl

 

151.8

A,w

(no match)

 

151.7

A

150.7 C-4 Chl, 150 C-9 Phe, 151 C-14 Phe

 

151.6

A

147.2 C-11 Chl

 

149.2

A

145 C-8 Phe

 

148.5

A

150.7 C-4 Chl, 150 C-9 Phe

 

148.3

A,w

(no match)

 

147.7

A

146.2 C-8 Chl

 

146.0

A

147.2 C-9 Chl

 

142.5

E

(no match)

Histidine

141.0

A

142 C-1 Phe

 

139.8

E

(no match)

Histidine

138.0

A,S

138 C-11 Phe

 

137.4

A

138.0 C-3 Chl, 136 C-3 Phe

 

(not observed)

137 C-4 Phe

 

136.5

A,b,w

136.1 C-2 Chl, 136 C-7 Phe

 

133.7

A

133.4 C-7 Chl, 134.0 C-12 Chl

 

(not observed)

131 C-2 Phe

 

130.0

A,S

133 C-13 Phe

 

129.5

A

126.2 C-13 Chl

 

129.2

E

128 C-12 Phe

Histidine?

128.7

E

129 C-31 Phe, 128 C-12 Phe

 

125.0

A,w

126.2 C-3 1 Chl

 

107.7

A,w

(no match)

 

106.9

E

108.2 C-10 Chl, 107 C-15 Phe

 

104.7

E

102.8 C-15 Chl, 105 C-10 Phe

 

97.9

E

98.1 C-5 Chl, 97 C-5 Phe

 

92.2

E

93.3 C-20 Chl, 93 C-20 Phe

 

51.0

A

52 C-17 Phe

(see Fig. 3)

48.9

A

51.4 C-17 Chl

(see Fig. 3)

29.3

A,w

32.5 C-171 Chl, 32 C-171 Phe

(not shown)

19.6

A,w

20.2 C-81 Chl, 20 C-81 Phe

(not shown)

  1. The reference chemical shifts of Chl a are obtained from solid aggregates of Chl a40 and of Phe a from isolated RCs of R. sphaeroides R26 carrying Phe a instead of BPhe a41. For details, see Supplementary Information.
  2. Abbreviations: A = enhanced absorptive; b = broad; Chl = chlorophyll a; E = emissive; Phe = pheophytin a; S = shoulder; w = weak.