In conclusion we would like to note that the investigated reactio

In conclusion we would like to note that the investigated reactions do not require any complex substrates, extreme conditions and proceed readily in neutral aqueous media. Thus, the combination of the photochemical and catalytic process can be considered as a putative route to the monosaccharides and their derivates on prebiotic Earth. This research was supported by program of Presidium of RAS Origin and evolution of biosphere, grant RNP. and Integration project of SB RAS 114. Gesteland R. F. and Atkins J. F. editors (1993) The RNA World. Cold Spring Harbor Laboratory, Cold Spring Harbor, New York. Pestunova, O., Simonov, A., Snytnikov,

V., Stoyanovsky, V. and Parmon, V. (2005) Putative mechanism of the sugar formation on prebiotic Earth initiated by UV-radiation. Adv. Space Res. 36(2):214–219. Simonov, A. N., Pestunova, Androgen Receptor Antagonist O. P., Matvienko, L. G., Snytnikov, V. N., Snytnikova, O. A., Tsentalovich, Yu. P. and Parmon, V. N. (2007) Possible prebiotic synthesis of monosaccharides from formaldehyde in presence of phosphates. Adv. Space Res. 40:1634–1640. Weber, A. L. (1998) Prebiotic Amino Acid Thioester Synthesis: Thiol-dependent Amino Acid Synthesis form Formose Substrates (Formaldehyde and Glycolaldehyde) and Ammonia. Origins of Life and Evolution of the Biosphere. 28:259–270.

and refs therein. selleck screening library E-mail: [email protected]​ru

Is the Peptide Bond Formation Activated by Cu 2+ Interactions? Insights from Density Functional Calculations M. Sodupe1, L. Rodríguez-Santiago1, A. Rimola 2, P. Ugliengo2 1Departament de Química, Universitat Autònoma de Barcelona, Bellaterra 08193, BCKDHA Spain; 2Dipartimento di Chimica I.F.M, NIS Centre of Excellence and INSTM 3-Methyladenine cost National Consortium, Università degli Studi di Torino, via P. Giuria 7-10125 Torino, Italy Metal cation binding to amino acids and peptides is a very active area of research due to their importance in many fields. With the advent of electrospray ion sources, metal cation complexes of amino acids and peptides can readily be generated in gas phase and studied by mass spectrometry techniques, from which structural and intrinsic reactivity information can be obtained. In particular, low energy collisionally activated dissociation experiments of Cu2+(Glycine)2 show that the [Cu2+(Glycine)2–H2O] complex, corresponding to the loss of a water molecule, is easily formed, which suggests the occurrence of an intracomplex condensation reaction leading to the formation of a peptide bond between two glycines (Seto and Stone, 1999). This reaction is similar to the Salt Induced Peptide Formation reaction proposed to take place in aqueous solution under prebiotic conditions (Rode, 1999).

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