Abstract：
:Photosystem II catalyzes the light-driven oxidation of water and reduction of plastoquinone in oxygenic photosynthesis. The manganese stabilizing protein (MSP) of photosystem II is an extrinsic subunit that plays an important role in catalytic activity. This subunit can be extracted and re-bound to the photosystem II reaction center. Extraction is associated with decreased stability of manganese binding by the enzyme and by loss in high rates of oxygen evolution activity; reconstitution reverses these phenomena. Since little is known about the assembly of complex membrane proteins, we have employed isotope editing and vibrational spectroscopy to obtain information about any changes in secondary structure that occur in MSP upon functional reconstitution to photosystem II. The spectroscopic data obtained are consistent with substantial changes in conformation when MSP binds to photosystem II; approximately 30-40% of the peptide backbone undergoes a change in secondary structure. These conclusions were reached by comparing different aliquots, before and after binding, of the same 13[C]MSP sample. Analysis of amide I band line shapes through Fourier deconvolution and nonlinear regression suggests that binding of MSP to photosystem II is associated with a decrease in random structure and an increase in beta-sheet content. We conclude that binding of MSP to the reaction center can induce folding of MSP. Our results also indicate that, in solution, MSP can sample a variety of conformational states, which differ in hydrogen bonding of the peptide backbone.
journal_name
Biochemistryjournal_title
Biochemistryauthors
Hutchison RS,Betts SD,Yocum CF,Barry BAdoi
10.1021/bi9724467subject
Has Abstractpub_date
1998-04-21 00:00:00pages
5643-53issue
16eissn
0006-2960issn
1520-4995pii
bi9724467journal_volume
37pub_type
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