Antiparallel β‐Sheet Conformation in Cyclopeptides Containing a Pseudo‐amino Acid with a biphenyl moiety
作者:
Volker Brandmeier,
Wolfgang H. B. Sauer,
Martin Feigel,
期刊:
Helvetica Chimica Acta
(WILEY Available online 1994)
卷期:
Volume 77,
issue 1
页码: 70-85
ISSN:0018-019X
年代: 1994
DOI:10.1002/hlca.19940770110
出版商: WILEY‐VCH Verlag GmbH
数据来源: WILEY
摘要:
AbstractThe biphenyl‐containing pseudo‐amino acids 2′‐(aminomethyl)biphenyl‐2‐carboxylic acid (Abc;1) and 2′‐(aminomethyl)biphenyl‐2‐acetic acid (Aba;2) are used as rigid spacers in the backbone of the cyclic peptides cyclo (‐Abc‐Ala‐Phe‐Gly‐)2(5), cyclo(‐Abc‐Ala‐Val‐Gly‐)2(6), cyclo(‐Aba‐Gly‐Phe‐Ala‐)2(7), and cyclo(‐Aba‐Ala‐Phe‐Gly‐)2(8). Three different interconverting diastereoisomers are found in solutions of each of these cyclopeptides due to the atropisomerism of the biphenyl units. NMR Techniques and molecular‐dynamics calculations allow to conclude that the major diastereoisomer of5(and6) in (D6)DMSO adopts a β‐sheet conformation. It is proposed that the pseudo‐amino acid1of (R)‐chirality forms, with attachedL‐amin
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