Directionality in Photosystem I: A Preliminary Study of the PsaA-A684D Mutant View Full Text


Ontology type: schema:Chapter     


Chapter Info

DATE

2008

AUTHORS

Rajiv Luthra , Audrius Jasaitis , Fabrice Rappaport , Kevin Redding

ABSTRACT

Like all photosynthetic reaction centers (RCs), the core of Photosystem I (PS1) is composed of two related membrane polypeptides that sequester electron transfer (ET) cofactors into two pseudo-symmetrical branches, each consisting of two chlorophylls (Chls) and a quinone. An open question in the evolution of photosynthesis is howthis symmetrical structure has been modified in type 2 RCs, in which ET proceeds exclusively down one branch. We have recently shown that directionality can be altered by breaking H-bonds to the ec3 Chl (Li et al. 2006), as visualized by the amplitudes of ET from the two phylloquinones (PhQA and PhQB). Here are presented new results on the first of a series of mutants designed to alter the environment of the ec2A/ec3A Chl pair. PsaAAla684 is close to this pair, with the methyl group pointing at ec2A. We have changed this residue to Asp. Like PsaA-Y696F, the PsaA-A684D mutant exhibited an increase in the faster component of PhQ reoxidation, consistent with a redirection of electrons down the B branch. More... »

PAGES

167-171

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/978-1-4020-6709-9_38

DOI

http://dx.doi.org/10.1007/978-1-4020-6709-9_38

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1051533971


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