Sam Mula
Brock University
4 Papers
16 Citations
Sam Mula is an academic researcher from Brock University. The author has contributed to research in topics: Electron paramagnetic resonance & Electron transfer. The author has an hindex of 4, co-authored 4 publications.
Chat about Author
Papers
Mutations in algal and cyanobacterial Photosystem I that independently affect the yield of initial charge separation in the two electron transfer cofactor branches.
Syed Lal Badshah,Junlei Sun,Sam Mula,Mike Gorka,Patricia L. Baker,Rajiv Luthra,Su Lin,Art van der Est,John H. Golbeck,Kevin Redding +9 more
TL;DR: The most significant finding is that the yield of electron transfer in the unaffected branch did not increase to compensate for the lower yield in the affected branch, suggesting that each branch of the reaction center appears to operate independently of the other in carrying out light-induced charge separation.
20
Blue copper protein analogue: synthesis and characterization of copper complexes of the N2S2 macrocycle 1,8-dithia-4,11-diazacyclotetradecane.
Tia L. Walker,Sam Mula,Wilhelm Malasi,James T. Engle,Christopher J. Ziegler,Art van der Est,Jody M. Modarelli,Michael J. Taschner +7 more
TL;DR: To improve understanding of copper at the active site of Type 1 copper proteins, Cu(I) and Cu(II) complexes of 1,8-dithia-4,11-diazacyclotetradecane have been successfully isolated and structurally characterized by X-ray crystallography.
18
Introduction of a hydrogen bond between phylloquinone PhQA and a threonine side-chain OH group in photosystem i
Sam Mula,Michael D. McConnell,Amy Ching,Nan Zhao,Heather L. Gordon,Gary Hastings,Kevin Redding,Art van der Est +7 more
TL;DR: Molecular dynamics simulations and ONIOM type electronic structure calculations indicate that it is possible for the OH group of the Thr side chain to form an H-bond to the carbonyl oxygen atom, O(4) of the phylloquinone, and that this results in an increase in the 2-methyl hyperfine couplings as observed in the transient EPR data.
17
Incorporation of a high potential quinone reveals that electron transfer in Photosystem I becomes highly asymmetric at low temperature.
Sam Mula,Anton Savitsky,Klaus Möbius,Klaus Möbius,Wolfgang Lubitz,John H. Golbeck,Mahir D. Mamedov,Alexey Yu. Semenov,Art van der Est +8 more
TL;DR: Time-resolved, multiple-frequency EPR spectroscopy can be used to probe the use of the two branches if electron transfer to the iron-sulfur clusters is blocked, and finds no evidence for radical-pair formation in the B-branch.