Biological complexity:photosynthesis new research (Introduction)

by David Turell , Tuesday, June 12, 2018, 01:38 (2357 days ago) @ David Turell

A secondary form of producing oxygen is now found in the mechanics of a giant enzyme:

https://phys.org/news/2018-06-oxygen-photosynthesis-mechanism-exposed.html

"Though chlorophyll is the best-known part, for the vivid green it colors nature, many compounds work together in photosynthesis. And Georgia Tech chemists devised clever experiments to inspect players intimately involved in the release of O2 from water in what's known as photosystem II (PSII).

"PSII is a complex protein structure found in plants and algae. It has a counterpart called photosystem I, an equally complex light-powered producer of oxygen and biomaterials.

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"Many details are still unknown, but here are some basic workings.
PS II is a biochemical complex made mostly of large amino acid corkscrew cylinders and some smaller such cylinders strung together with amino acid strands. The reaction cycle that extracts the O2 from H2O occurs at a tiny spot, which the study focused on.

"For scale, if PSII were a fairly tall, very wide building, the spot might be the size of a large door in about the lower center of the building, and the metal cluster would be located there. Intertwined in the proteins would be sprawling molecules that include beta-carotene and chlorophyll, a great natural photoelectric semiconductor.

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"Photons from sunlight bombard photosystem II and displace electrons in the chlorophyll," Barry said. "That creates moving negative charges.

"What is the metal catalyst?

"The metal catalyst acts like a capacitor, building up charge that it uses to expedite four chemical reactions that release the O2 by removing four electrons, one-by-one, from two water molecules. In the process, water also spins off four H+ ions, i.e. protons, from two H2O molecules.

"An additional highly reactive compound acts as a "switch" to drive the electron movement in each step of the reaction cycle.

"Near the metal cluster is a common amino acid called tyrosine, a little building block on that mammoth protein building. The light reactions remove one electron from tyrosine, making it what's called an unstable radical, and the radical version of tyrosine strongly attracts a new electron.

"It very quickly gets that new electron from the metal cluster. As PSII absorbs photons, the taking of an electron from tyrosine and its radical's grabbing of a new one from the cluster repeats rapidly, making the tyrosine a kind of flickering switch.

"'The tyrosine radical drives the cycle around, and what they (Guo and He) did in the lab was to develop a way of seeing the radical reaction in the presence of the metal cluster," Barry said.

"Guo and He also found that the calcium atom in the cluster has key interactions with tyrosine.

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"The researchers observed the processes via vibrational spectroscopy, which revealed qualities of tyrosine's chemical bonds. The researchers also examined the calcium and discovered a special interaction between it and tyrosine.

"'A new thing we saw was that the calcium ion made the tyrosine twist a certain way," Barry said. "It turns out that the tyrosine may be a very flexible switch."

"The researchers also swapped out calcium for other metals and found that the calcium fulfills this role quite optimally."

Comment: Another very complex system that demands a recognition of design.