Cysteine and cystine adsorption on FeS2(100)

SURFACE SCIENCE

卷:674

Article

Suzuki, Teppei¹  Yano, Taka-aki^2,3  Hara, Masahiko^2,3  Ebisuzaki, Toshikazu¹ 

[1] RIKEN, Computat Astrophys Lab, 2-1 Hirosawa, Wako, Saitama 3510198, Japan

[2] Tokyo Inst Technol, Chem Evolut Lab Unit, Earth Life Sci Inst, Sch Mat & Chem Technol,Midori Ku, 4259-G1-7 Nagatsuta, Yokohama, Kanagawa 2268502, Japan

[3] Tokyo Inst Technol, Dept Chem Sci & Engn, Sch Mat & Chem Technol, Midori Ku, 4259-G1-7 Nagatsuta, Yokohama, Kanagawa 2268502, Japan

关键词: Pyrite;    Cysteine;    Cystine;    Adsorption;    Prebiotic chemistry;    Origin of life;   

DOI  :  10.1016/j.susc.2018.03.011

来源: Elsevier

【 摘 要 】

Iron pyrite (FeS2) is the most abundant metal sulfide on Earth. Owing to its reactivity and catalytic activity, pyrite has been studied in various research fields such as surface science, geochemistry, and prebiotic chemistry. Importantly, native iron-sulfur clusters are typically coordinated by cysteinyl ligands of iron-sulfur proteins. In the present paper, we study the adsorption of L-cysteine and its oxidized dimer, L-cystine, on the FeS2 surface, using electronic structure calculations based density functional theory and Raman spectroscopy measurements. Our calculations suggest that sulfur-deficient surfaces play an important role in the adsorption of cysteine and cystine, In the thiol headgroup adsorption on the sulfur-vacancy site, dissociative adsorption is found to be energetically favorable compared with molecular adsorption. In addition, the calculations indicate that, in the cystine adsorption on the defective surface under vacuum conditions, the formation of the S-Fe bond is energetically favorable compared with molecular adsorption. Raman spectroscopic measurements suggest the formation of cystine molecules through the S-S bond on the pyrite surface in aqueous solution. Our results might have implications for chemical evolution at mineral surfaces on the early Earth and the origin of iron-sulfur proteins, which are believed to be one of the most ancient families of proteins.

【 授权许可】

Free