JpGU-AGU Joint Meeting 2017

Presentation information

Print

[EE] Oral

B (Biogeosciences) » B-CG Complex & General

[B-CG07] [EE] Earth and Planetary Science Frontiers for Life and Global Environment

Mon. May 22, 2017 9:00 AM - 10:30 AM 201B (International Conference Hall 2F)

convener:Yoshinori Takano(Japan Agency for Marine-Earth Science and Technology (JAMSTEC)), Yohey Suzuki(Graduate School of Science, The University of Tokyo), Keisuke Fukushi(Institute of Nature & Environmental Technology, Kanazawa University), Katsunori Yanagawa(Graduate School of Social and Cultural Studies, Kyushu University), Chairperson:Yoshinori Takano(Japan Agency for Marine-Earth Science and Technology (JAMSTEC)), Chairperson:Yohey Suzuki(Graduate School of Science, The University of Tokyo), Chairperson:Shingo Kato(Japan Agency for Marine-Earth Science and Technology)

9:00 AM - 9:15 AM

[BCG07-01] Biochemistry meets geochemistry: Sulfur isotope fractionation factor of the APS reductase and implications for interpreting biological sulfur isotopes signals.

★Invited papers

*Shawn E McGlynn1, Min Sub Sim2 (1.ELSI - Tokyo Institute of Technology, 2.Seoul National University)

Keywords:Enzymes, Isotopes, Sulfate Reduction, Biogeochemistry

Sulfur isotopes have a long history of use to gauge the occurrence and extent of biogeochemical processes on Earth, and the advent of modern techniques including multiple isotope measurements and secondary isotope mass spectrometry indicate that much knowledge remains to be obtained through their analysis. A significant portion of microbial sulfur isotope fractionation occurs through the process of dissimilatory sulfate reduction (DSR); however very little data are available which describe the extent and variability of sulfur isotope fractionation at the level of the individual enzymes which carry out intracellular sulfur conversions. Here, I will present new data on the fractionation of sulfur by the enzyme adenylylsulfate reductase, which catalyzes a two electron reduction of adenylylsulfate to form sulfite (Asr in the figure below). The results will be interpreted in the context of enzyme evolution, cellular physiology, and also associated geochemical implications.