Figure 14.26

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description

Figure 14.26. To maximize light absorption, Halobacterium salinarium archaea pack their entire cell membrane with bacteriorhodopsin. - The protein forms trimers that pack in hexagonal arrays, forming the “purple membrane.”. Phototrophy. Figure 14.27. - PowerPoint PPT Presentation

Transcript of Figure 14.26

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Figure 14.26

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Phototrophy

Figure 14.27

• To maximize light absorption, Halobacterium salinarium archaea pack their entire cell membrane with bacteriorhodopsin.

• - The protein forms trimers that pack in hexagonal arrays, forming the “purple membrane.”

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• Each type of chlorophyll contains a characteristic chromophore, light-absorbing electron carrier.

Chlorophylls

- Chlorophyll molecules differ slightly in their substituent groups around the ring.- These slight differences alter their absorption spectra.

Figure 14.29

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Figure 14.31

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• In purple bacteria, the efficiency of photon uptake is increased even more by the presence of thylakoids.

- Extensive backfolding of the photosynthetic membranes in oval pockets

Figure 14.32

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Figure 14.35

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Figure 14.34

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Figure 14.33

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Figure 14.36

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• Animation: Oxygenic Photosynthesis

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Oxygenic Z Pathway

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Overview of the Calvin CycleFigure 15.5

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• Rubisco consists of small (S) and large (L) subunits.• - Catalyzes the condensation of CO2 to ribulose

1,5-bisphosphate, and the splitting of the unstable 6C intermediate into two 3C PGA molecules

Mechanism of Rubisco

Figure 15.6AB

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• Many organisms contain the Rubisco complex within polyhedral structures called carboxysomes.

• The carboxysome takes up bicarbonate (HCO3–), which

is then immediately converted to CO2 by carbonic anhydrase.

Carboxysomes Contain Rubisco

Figure 15.8

- The CO2 is then fixed by Rubisco.