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Title: Use of protein cross-linking and radiolytic footprinting to elucidate PsbP and PsbQ interactions within higher plant Photosystem II

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America
 [1];  [1];  [2];  [3];  [2];  [4];  [3];  [1]
  1. Louisiana State Univ., Baton Rouge, LA (United States). Dept. of Biological Sciences
  2. Louisiana State Univ., Baton Rouge, LA (United States). J. Bennett Johnston Sr. Center for Advanced Microstructures and Devices
  3. Univ. of Cincinnati, OH (United States). Dept. of Chemistry
  4. Louisiana State Univ., Baton Rouge, LA (United States). Dept. of Biological Sciences and Center for Computation and Technology

We used protein cross-linking and radiolytic footprinting coupled with high-resolution mass spectrometry to examine the structure of PsbP and PsbQ when they are bound to Photosystem II, in this paper. In its bound state, the N-terminal 15-amino-acid residue domain of PsbP, which is unresolved in current crystal structures, interacts with domains in the C terminus of the protein. These interactions may serve to stabilize the structure of the N terminus and may facilitate PsbP binding and function. These interactions place strong structural constraints on the organization of PsbP when associated with the Photosystem II complex. Additionally, amino acid residues in the structurally unresolved loop 3A domain of PsbP (90K–107V), 93Y and 96K, are in close proximity (≤11.4 Å) to the N-terminal 1E residue of PsbQ. Our findings are the first, to our knowledge, to identify a putative region of interaction between these two components. Cross-linked domains within PsbQ were also identified, indicating that two PsbQ molecules can interact in higher plants in a manner similar to that observed by Liu et al. [(2014) Proc Natl Acad Sci 111(12):4638–4643] in cyanobacterial Photosystem II. Furthermore, this interaction is consistent with either intra-Photosystem II dimer or inter-Photosystem II dimer models in higher plants. Finally, OH• produced by synchrotron radiolysis of water was used to oxidatively modify surface residues on PsbP and PsbQ. Finally, domains on the surface of both protein subunits were resistant to modification, indicating that they were shielded from water and appear to define buried regions that are in contact with other Photosystem II components.

Research Organization:
Louisiana State Univ., Baton Rouge, LA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Institutes of Health (NIH)
Grant/Contract Number:
FG02-98ER20310; RR019900; GM58843
OSTI ID:
1356192
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Vol. 111, Issue 45; ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 30 works
Citation information provided by
Web of Science

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Cited By (6)

The extrinsic proteins of photosystem II: update journal January 2016
Structure of spinach photosystem II–LHCII supercomplex at 3.2 Å resolution journal May 2016
The N-terminal sequence of the extrinsic PsbP protein modulates the redox potential of Cyt b559 in photosystem II journal February 2016
Structural Coupling of Extrinsic Proteins with the Oxygen-Evolving Center in Photosystem II journal February 2016
The Role of Mass Spectrometry in Structural Studies of Flavin-Based Electron Bifurcating Enzymes journal July 2018
The Use of Advanced Mass Spectrometry to Dissect the Life-Cycle of Photosystem II journal May 2016