2RQO

Solution structure of Polytheonamide B

2RQO の概要

• エントリーDOI: 10.2210/pdb2rqo/pdb
• 関連するBIRD辞書のPRD_ID: PRD_000224
• 分子名称: polytheonamide B (1 entity in total)
• 機能のキーワード: beta-helix, toxin
• 由来する生物種: Theonella swinhoei
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 5033.76

構造登録者

Hamada, N.,Matsunaga, S.,Fujiwara, M.,Fujjita, K.,Hirota, H.,Schmucki, R.,Guntert, P.,Fusetani, N. (登録日: 2009-09-03, 公開日: 2010-09-15, 最終更新日: 2023-11-15)

主引用文献

Hamada, T.,Matsunaga, S.,Fujiwara, M.,Fujita, K.,Hirota, H.,Schmucki, R.,Guntert, P.,Fusetani, N.
Solution Structure of Polytheonamide B, a Highly Cytotoxic Nonribosomal Polypeptide from Marine Sponge
J.Am.Chem.Soc., 2010

PubMed Abstract: Polytheonamide B (pTB), a highly cytotoxic polypeptide, is one of the most unusual nonribosomal peptides of sponge origin. pTB is a linear 48-residue peptide with alternating D- and L-amino acids and contains a total of eight types of nonproteinogenic amino acids. To investigate the mechanisms underlying its cytotoxic activity, we determined the three-dimensional structure of pTB by NMR spectroscopy, structure calculation, and energy minimization. pTB adopts a single right-handed β(6.3)-helical structure in a 1:1 mixture of methanol/chloroform with a length of approximately 45 A and a hydrophilic pore of ca. 4 A inner diameter. These features indicate that pTB molecules form transmembrane channels that permeate monovalent cations as gramicidin A channels do. The strong cytotoxicity of pTB can be ascribed to its ability to form single molecule channels through biological membranes.

PubMed: 20795624
DOI: 10.1021/ja104616z

実験手法

SOLUTION NMR