Table I. Average amounts (pmol μg protein−1) of all measured protein subunits in Trichodesmium IMS101

Shown are results (as averages) for 1 h and 5 h after the onset of light (n = 3). Average values of the two sampling points (n = 6) are also shown. The proteins measured were PsbA (D1 protein of PSII), PsaC (core subunit of PSI), RbcL (the large subunit of Rubisco), NifH (Fe protein of nitrogenase), and GlnA (a subunit of Gln synthetase).

Protein Amount50 μmol Photons m−2 s−1200 μmol Photons m−2 s−1
150 μatm pCO2900 μatm pCO2150 μatm pCO2900 μatm pCO2
1 h after the onset of light
    PsbA0.083 ± 0.0220.065 ± 0.0210.061 ± 0.0100.040 ± 0.000
    PsaC0.113 ± 0.0100.136 ± 0.0100.098 ± 0.0140.092 ± 0.016
    RbcL0.504 ± 0.0590.600 ± 0.0850.625 ± 0.0460.553 ± 0.072
    AtpB0.103 ± 0.0210.114 ± 0.0230.137 ± 0.0160.116 ± 0.057
    NifH0.165 ± 0.0170.163 ± 0.0320.255 ± 0.0600.173 ± 0.025
    GlnA0.111 ± 0.0120.097 ± 0.0120.129 ± 0.0070.107 ± 0.014
5 h after the onset of light
    PsbA0.088 ± 0.0050.075 ± 0.0120.068 ± 0.0180.056 ± 0.017
    PsaC0.123 ± 0.0190.120 ± 0.0100.087 ± 0.0080.084 ± 0.005
    RbcL0.683 ± 0.0750.709 ± 0.0650.563 ± 0.0480.529 ± 0.054
    AtpB0.214 ± 0.0340.142 ± 0.0100.159 ± 0.0610.128 ± 0.035
    NifH0.256 ± 0.0090.270 ± 0.0570.349 ± 0.0350.167 ± 0.025
    GlnA0.120 ± 0.0000.090 ± 0.0240.139 ± 0.0130.108 ± 0.004
Average of both time points
    PsbA0.085 ± 0.0150.070 ± 0.0170.064 ± 0.0140.048 ± 0.014
    PsaC0.118 ± 0.0150.128 ± 0.0130.092 ± 0.0110.087 ± 0.010
    RbcL0.593 ± 0.1150.655 ± 0.0910.594 ± 0.0540.541 ± 0.059
    AtpB0.158 ± 0.0790.128 ± 0.0190.148 ± 0.0160.122 ± 0.008
    NifH0.201 ± 0.0510.217 ± 0.0720.302 ± 0.0680.169 ± 0.033
    GlnA0.116 ± 0.0060.093 ± 0.0050.134 ± 0.0070.108 ± 0.000