1JMB

CRYSTAL STRUCTURE OF FOUR-HELIX BUNDLE MODEL

1JMB の概要

• エントリーDOI: 10.2210/pdb1jmb/pdb
• 関連するPDBエントリー: 1EC5 1JM0
• 分子名称: PROTEIN (FOUR-HELIX BUNDLE MODEL), MANGANESE (II) ION, DIMETHYL SULFOXIDE, ... (4 entities in total)
• 機能のキーワード: alpha-helical bundle, protein design, de novo protein
• タンパク質・核酸の鎖数: 3
• 化学式量合計: 17807.52

構造登録者

Di Costanzo, L.,Geremia, S. (登録日: 2001-07-18, 公開日: 2002-01-16, 最終更新日: 2024-11-20)

主引用文献

Di Costanzo, L.,Wade, H.,Geremia, S.,Randaccio, L.,Pavone, V.,DeGrado, W.F.,Lombardi, A.
Toward the de novo design of a catalytically active helix bundle: a substrate-accessible carboxylate-bridged dinuclear metal center.
J.Am.Chem.Soc., 123:12749-12757, 2001

PubMed Abstract: De novo design of proteins provides an attractive approach to uncover the essential features required for their functions. Previously, we described the design and crystal structure determination of a di-Zn(II) complex of "due-ferri-1" (DF1), a protein patterned after the diiron-dimanganese class of redox-active proteins [Lombardi, A.; Summa, C.; Geremia, S.; Randaccio, L.; Pavone, V.; DeGrado, W. F. Proc. Natl. Acad. Sci. U.S.A. 2000, 97, 6298-6305]. The overall structure of DF1, which contains a carboxylate-bridged dinuclear metal site, agrees well with the intended design. However, access to this dimetal site is blocked by a pair of hydrophobic leucine residues (L13 and L13'), which prevent facile entry of metal ions and small molecules. We have now taken the next step in the eventual construction of a catalytically active metalloenzyme by engineering an active site cavity into DF1 through the replacement of these two leucine residues with smaller residues. The crystal structure of the dimanganous form of L13A-DF1 indeed shows a substrate access channel to the dimetal center. In the crystal structure, water molecules and a ligating dimethyl sulfoxide molecule, which forms a monatomic bridge between the metal ions, occupy the cavity. Furthermore, the diferric form of a derivative of L13A-DF1, DF2, is shown to bind azide, acetate, and small aromatic molecules.

PubMed: 11749531
DOI: 10.1021/ja010506x

実験手法

X-RAY DIFFRACTION (2.2 Å)