Facilitated synthesis of peptaibols: Alamethicin via enzymatic segment condensation

Urszula Slomczynska, Janusz Zabrocki, Krzysztof Kaczmarek, Miroslaw T. Leplawy, Demise D. Beusen, Garland R. Marshall

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Abstract

We have used a combined chemical‐enzymatic approach to facilitate the total synthesis of the 20‐residue peptaibol, alamethicin. The 1–11 segment of alamethicin, having a C‐terminal Gly, and the 12–20 segment, having an N‐terminal Leu, were prepared by well‐established chemical methods, and then coupled using papain to afford a 54% yield of alamethicin in straightforward fashion. In contrast to the reported chemical syntheses of alamethicin requiring side‐chain protection at Glu, 18 the papain‐catalyzed coupling proceeded readily and selectively using a C‐terminal segment having a free γ‐carboxyl group at this position. Several alamethicin partial sequences were obtained via enzymatic formation of the Gly 11−Leu12 bond. The high efficiency of this route is illustrated by the enzymatic assembly of the 1–17 alamethicin fragment on a 400–mg scale in 62% yield. An alternative route to alamethicin through enzymatic formation of the Ala6−Gln7 bond was less successful because of a low yield in the final coupling. © 1992 John Wiley & Sons, Inc.

Original languageEnglish
Pages (from-to)1461-1470
Number of pages10
JournalBiopolymers
Volume32
Issue number11
DOIs
StatePublished - Nov 1992

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    Slomczynska, U., Zabrocki, J., Kaczmarek, K., Leplawy, M. T., Beusen, D. D., & Marshall, G. R. (1992). Facilitated synthesis of peptaibols: Alamethicin via enzymatic segment condensation. Biopolymers, 32(11), 1461-1470. https://doi.org/10.1002/bip.360321106