1F5Y

NMR STRUCTURE OF A CONCATEMER OF THE FIRST AND SECOND LIGAND-BINDING MODULES OF THE HUMAN LDL RECEPTOR

1F5Y の概要

• エントリーDOI: 10.2210/pdb1f5y/pdb
• 関連するPDBエントリー: 1ajj 1ldl 1ldr
• 分子名称: LOW-DENSITY LIPOPROTEIN RECEPTOR, CALCIUM ION (2 entities in total)
• 機能のキーワード: beta hairpin, 3-10 helix, calcium binding, lipid binding protein
• 由来する生物種: Homo sapiens (human)
• 細胞内の位置: Cell membrane; Single-pass type I membrane protein: P01130
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 9339.15

構造登録者

Kurniawan, N.D.,Atkins, A.R.,Brereton, I.M.,Kroon, P.A.,Smith, R. (登録日: 2000-06-18, 公開日: 2000-08-30, 最終更新日: 2024-10-09)

主引用文献

Kurniawan, N.D.,Atkins, A.R.,Bieri, S.,Brown, C.J.,Brereton, I.M.,Kroon, P.A.,Smith, R.
NMR structure of a concatemer of the first and second ligand-binding modules of the human low-density lipoprotein receptor.
Protein Sci., 9:1282-1293, 2000

PubMed Abstract: The ligand-binding domain of the human low-density lipoprotein receptor consists of seven modules, each of 40-45 residues. In the presence of calcium, these modules adopt a common polypeptide fold with three conserved disulfide bonds. A concatemer of the first and second modules (LB(1-2)) folds efficiently in the presence of calcium ions, forming the same disulfide connectivities as in the isolated modules. The three-dimensional structure of LB(1-2) has now been solved using two-dimensional 1H NMR spectroscopy and restrained molecular dynamics calculations. No intermodule nuclear Overhauser effects were observed, indicating the absence of persistent interaction between them. The near random-coil NH and H alpha chemical shifts and the low phi and psi angle order parameters of the four-residue linker suggest that it has considerable flexibility. The family of LB(1-2) structures superimposed well over LB1 or LB2, but not over both modules simultaneously. LB1 and LB2 have a similar pattern of calcium ligands, but the orientations of the indole rings of the tryptophan residues W23 and W66 differ, with the latter limiting solvent access to the calcium ion. From these studies, it appears that although most of the modules in the ligand-binding region of the receptor are joined by short segments, these linkers may impart considerable flexibility on this region.

PubMed: 10933493

実験手法

SOLUTION NMR