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The heliobacterial reaction center (HbRC) is widely considered the simplest and most primitive photosynthetic reaction center (RC) still in existence. Despite the simplicity of the HbRC, many aspects of the electron transfer mechanism remain unknown or under debate. Improving our understanding of the structure and function of the HbRC is important in determining its role in the evolution of photosynthetic RCs. In this work, the function and properties of the iron-sulfur cluster FX and quinones of the HbRC were investigated, as these are the characteristic terminal electron acceptors used by Type-I and Type-II RCs, respectively. In Chapter 3, I develop a system to directly detect quinone double reduction activity using reverse-phase high pressure liquid chromatography (RP-HPLC), showing that Photosystem I (PSI) can reduce PQ to PQH2. In Chapter 4, I use RP-HPLC to characterize the HbRC, showing a surprisingly small antenna size and confirming the presence of menaquinone (MQ) in the isolated HbRC. The terminal electron acceptor FX was characterized spectroscopically and electrochemically in Chapter 5. I used three new systems to reduce FX in the HbRC, using EPR to confirm a S=3/2 ground-state for the reduced cluster. The midpoint potential of FX determined through thin film voltammetry was -372 mV, showing the cluster is much less reducing than previously expected. In Chapter 7, I show light-driven reduction of menaquinone in heliobacterial membrane samples using only mild chemical reductants. Finally, I discuss the evolutionary implications of these findings in Chapter 7.
ContributorsCowgill, John (Author) / Redding, Kevin (Thesis advisor) / Jones, Anne (Committee member) / Fromme, Petra (Committee member) / Arizona State University (Publisher)
Created2012
ContributorsSchildkret, David (Conductor) / Chamber Singers (Performer) / ASU Library. Music Library (Publisher)
Created2018-02-10
ContributorsGlenn, Erica (Conductor) / Evans, Bartlett R. (Conductor) / Oh, Eun-Mi (Conductor) / Thompson, Jason D. (Conductor) / Schildkret, David (Conductor) / Concert Choir (Performer) / Arizona Statesmen (Performer) / Women's Chorus (Performer) / Gospel Choir (Performer) / Barrett Choir (Performer) / Chamber Singers (Performer) / Choral Union (Performer) / ASU Library. Music Library (Publisher)
Created2017-11-30
ContributorsUniversity Choirs (Performer) / ASU Library. Music Library (Publisher)
Created2000-11-16
ContributorsSchildkret, David (Conductor) / White, Jamilyn (Performer) / Krison, Danielle (Performer) / Barefield, Robert (Performer) / FitzPatrick, Carole (Performer) / Chamber Singers (Performer) / Choral Union (Performer) / Symphonic Chorale (Performer) / University Symphony Orchestra (Performer) / ASU Library. Music Library (Publisher)
Created2007-04-26
ContributorsLyne, Gregory K. (Performer) / Stutzman, Gina (Performer) / Woodgate, Lyn (Performer) / Cornner, Charles B. (Performer) / Rozukalns, Andris L. (Performer) / Women's Choir (Performer) / University Choir (Performer) / ASU Library. Music Library (Publisher)
Created1996-11-24
ContributorsCherland, Carl (Performer) / Fuller, Charles L. (Performer) / O'Brien, Robert (Performer) / Hooper, Wm. John (Performer) / Graduate Chorale (Performer) / Recital Chorale (Performer) / ASU Library. Music Library (Publisher)
Created1987-10-01
ContributorsRoueche, Michelle (Performer) / Partin, Darrell (Performer) / Wiest-Parthun, Karen (Performer) / Harvison, Emery (Performer) / Hernandez, Rene (Performer) / Foley, Laura (Performer) / Women's Choir (Performer) / ASU Library. Music Library (Publisher)
Created1994-04-21
ContributorsParthun, Karen (Conductor) / Hickman, Miriam, 1955- (Performer) / University Choir (Performer) / Vocal Jazz Ensemble (Performer) / ASU Library. Music Library (Publisher)
Created2000-11-19
ContributorsPeterson, Craig C. (Director) / Butler, Robb (Director) / Forkner, Christina (Contributor) / Leman, Christi (Performer) / Miller, Kenny (Musician) (Performer) / Howard, Johnothon (Performer) / Gibson, Ted (Performer) / Herberger Singers (Performer) / University Choir (Performer) / ASU Library. Music Library (Publisher)
Created2003-10-12