TY - JOUR
T1 - Facilitated synthesis of peptaibols
T2 - Alamethicin via enzymatic segment condensation
AU - Slomczynska, Urszula
AU - Zabrocki, Janusz
AU - Kaczmarek, Krzysztof
AU - Leplawy, Miroslaw T.
AU - Beusen, Demise D.
AU - Marshall, Garland R.
PY - 1992/11
Y1 - 1992/11
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0026955822&partnerID=8YFLogxK
U2 - 10.1002/bip.360321106
DO - 10.1002/bip.360321106
M3 - Article
C2 - 1457727
AN - SCOPUS:0026955822
SN - 0006-3525
VL - 32
SP - 1461
EP - 1470
JO - Biopolymers
JF - Biopolymers
IS - 11
ER -