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Crystal structure of the Photosystem II assembly factor LPA19 from Arabidopsis thaliana at 1.2 Å resolution
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Kemiska institutionen. (Uwe Sauer)
(Engelska)Manuskript (preprint) (Övrigt vetenskapligt)
Nationell ämneskategori
Strukturbiologi
Identifikatorer
URN: urn:nbn:se:umu:diva-144014OAI: oai:DiVA.org:umu-144014DiVA, id: diva2:1175139
Tillgänglig från: 2018-01-17 Skapad: 2018-01-17 Senast uppdaterad: 2018-06-09Bibliografiskt granskad
Ingår i avhandling
1. Structural biology studies of thylakoid lumen proteins required for photosystem II assembly and function
Öppna denna publikation i ny flik eller fönster >>Structural biology studies of thylakoid lumen proteins required for photosystem II assembly and function
2018 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Little is known about the structures and functions of thylakoid lumen proteins. However, some of these proteins have an essential role in photosynthesis. Photosystem II (PSII) complexes are embedded in the thylakoid membrane of oxygenic photosynthetic organisms and one of the central subunits, the D1 protein, is damaged by light during the light driven water – splitting reaction and must be replaced frequently. One of the thylakoid lumen proteins that is essential for assembly and renewal of PSII complexes is the High Chlorophyll Fluorescence 136 (HCF136) protein. Another important protein for the PSII complex assembly is the Low PSII Accumulation Protein 19 (LPA19). Both proteins, HCF136 and LPA19, were shown to bind to the core subunits of the PSII complex from the lumenal side and LPA19 has been shown to explicitly interact with the soluble C-terminus of the D1 protein, one of the core PSII complex proteins. Prior to the replacement of the damaged D1 protein, the PSII complex needs to be disassembled, which is done with the help of the Maintenance of Photosystem II under High light 2 (MPH2) protein. MPH2, also called TL16, is required during the repair cycle of the PSII complex particularly under increased and fluctuating light conditions.

In this work I have determined the three-dimensional X-ray structures of the HCF136 protein at 1.6 Å resolution and the LPA19 protein at 1.2 Å resolution and have also biochemically analyzed possible interactions of HCF136 with the C-termini of D1 protein. In addition, we have determined the NMR structure of the MPH2 protein.

The protein structures of HCF136, LPA19, and MPH2 determined from A. thaliana provide us with a starting point for further studies to improve our understanding of their functional roles in the assembly, maintenance, disassembly and renewal of the PSII complex. The structures are revealing the molecular details that are particularly important during the design of mutations to study protein-protein interactions and the binding of co-factors.

Furthermore, I have contributed to the characterization of AnPrx6, the 1-Cyx peroxiredoxin from Anabaena sp. 7120. Peroxiredoxins are important caretakers of reactive oxygen species and a homolog PrxQ in A.thaliana is found in the thylakoid lumen. The dimeric AnPrx6 protein revealed different active site residues conformations in each of the dimers, which is probably coupled to its enzymatic activity. Unexpectedly, the protein acted also as a chaperone and showed chaperone activity in its dimeric state, which is a novelty for Prx proteins.

Ort, förlag, år, upplaga, sidor
Umeå: Umeå universitet, 2018. s. 48
Nyckelord
structural biology, x-ray crystallography, cloning, protein expression, HCF136, LPA19, MPH2, Prx6, photosynthesis, thylakoid lumen PSII
Nationell ämneskategori
Strukturbiologi
Identifikatorer
urn:nbn:se:umu:diva-144016 (URN)978-91-7601-807-1 (ISBN)
Disputation
2018-02-05, N430, Naturvetarhuset, Umeå, 10:00 (Engelska)
Opponent
Handledare
Tillgänglig från: 2018-01-22 Skapad: 2018-01-17 Senast uppdaterad: 2018-06-09Bibliografiskt granskad

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