Search Menu
Photonics Media Photonics Buyers' Guide Photonics EDU Photonics Spectra BioPhotonics EuroPhotonics Industrial Photonics Photonics Showcase Photonics ProdSpec Photonics Handbook
More News
Email Facebook Twitter Google+ LinkedIn Comments

Structure of plant photosystem I determined at 3.4 Å

Jun 2007
Plant photosystem I is a nanophotochemical structure that plays an important part in photosynthesis. It consists of a reaction center and light-harvesting complexes. The photosystem generates the most negative redox potential known in nature (–1 V), uses almost every photon it traps to drive electron transport and produces a quantum yield of almost one.


This structure of plant photosystem I is shown viewed from the stroma. Structural elements not in the previous model are shown in red. Chlorophylls in the reaction center are shown as yellow or cyan. Psa and LHC subunits also are indicated. Reprinted with permission of Nature.

Researchers from Tel Aviv University in Israel previously determined the photosystem’s structure at 4.4 Å resolution but have found even more details in a new structure at 3.4-Å resolution.

As reported in the May 3 issue of Nature, the scientists used x-ray crystallography to determine the structure of the photosystem from pea (Pisum sativum), which revealed 17 protein subunits, including details of 11 of the 12 subunits making up the reaction center.

A quantum of electromagnetic energy of a single mode; i.e., a single wavelength, direction and polarization. As a unit of energy, each photon equals hn, h being Planck's constant and n, the frequency of the propagating electromagnetic wave. The momentum of the photon in the direction of propagation is hn/c, c being the speed of light.
As We Go To PressBiophotonicsBreaking Newsnanophotochemical structurephotonPresstime Bulletinx-ray

Terms & Conditions Privacy Policy About Us Contact Us
back to top
Facebook Twitter Instagram LinkedIn YouTube RSS
©2019 Photonics Media, 100 West St., Pittsfield, MA, 01201 USA,

Photonics Media, Laurin Publishing
x Subscribe to BioPhotonics magazine - FREE!
We use cookies to improve user experience and analyze our website traffic as stated in our Privacy Policy. By using this website, you agree to the use of cookies unless you have disabled them.