Objective
Photosynthetic water oxidation that occurs in photosystem II (PSII) is one of the key processes in photosynthesis. Understanding the reactions in PSII on molecular and electronic level is of fundamental interest for photosynthesis research and also important for the development of artificial photosystems for energy production. A redox active tyrosine (YZ) is known to be essential for the electron transfer reactions that ultimately lead to water oxidation in PSII and it has also been suggested that this amino acid is directly involved in catalysing water oxidation. The mechanism for YZ redox reactions, and specifically the mechanism for proton coupled redox reactions, is however unresolved. The mechanism for YZ oxidation is part of this proposal.
The first crystallographic data on an atomic level that was recently published suggests that a calcium (Ca) ion is the metal closest to YZ and that this Ca ion is an integral part of the catalytic water oxidation site. Clearly the role of Ca is at the heart of the mechanism for YZ redox chemistry as well as for the catalytic water-splitting activity in PSII. To find the impact of Ca on YZ redox kinetics as well as on the water oxidation activity in PSII I will use Ca depleted PSII samples. On this material I will perform a complete study of the effect of pH and temperature on YZ redox kinetics to determine the mechanism for YZ oxidation using time resolved absorption measurements.
I have previously shown that the pH-dependence of tyrosine oxidation can be used for mechanistic discrimination for proton coupled electron transfer reactions in synthetic tyrosine model complexes. In parallel I will examine the redox events occurring in the water oxidising complex using advanced EPR to determine the functional role of Ca for water oxidation activity in PSII. In addition PS II samples where Ca has been replaced with the larger strontium ion will be examined using the same techniques to determine the structural role of Ca.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- natural sciences chemical sciences organic chemistry organic reactions
- natural sciences chemical sciences electrochemistry electrolysis
- natural sciences chemical sciences inorganic chemistry alkaline earth metals
- natural sciences chemical sciences organic chemistry amines
- natural sciences biological sciences botany
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Keywords
Project’s keywords as indicated by the project coordinator. Not to be confused with the EuroSciVoc taxonomy (Fields of science)
Project’s keywords as indicated by the project coordinator. Not to be confused with the EuroSciVoc taxonomy (Fields of science)
Programme(s)
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Topic(s)
Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Call for proposal
Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
FP6-2002-MOBILITY-5
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Funding Scheme
Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Coordinator
GIF-SUR-YVETTE
France
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.