Freza S. Water-assisted peptide bond formation between two double amino acid molecules in the gas phase.
J Mol Model 2019;
25:184. [PMID:
31175466 DOI:
10.1007/s00894-019-4081-9]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2019] [Accepted: 05/28/2019] [Indexed: 11/27/2022]
Abstract
The gas phase mechanism of the peptide bond formation between two double amino acid (DAA) molecules described by the (NH2)2C(COOH)2 formula is investigated in the presence of a water molecule. Formations of trans and cis DAA-DAA dipeptide products along both concerted and stepwise mechanisms have been studied at the CCSD(T)/aug-cc-pVDZ//MP2/aug-cc-pVDZ level. The results indicate that the activation energy barriers estimated for the water-assisted mechanisms are significantly reduced in comparison to the corresponding uncatalyzed reactions. The trans DAA-DAA isomer is expected to dominate in the final product due to its larger stability compared to the cis DAA-DAA product.
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