1H-NMR spectroscopic manifestations of ligand binding to the kringle 4 domain of human plasminogen.

Abstract:

:Structural aspects of the binding of the linear ligands N alpha-acetyl-L-lysine (AcLys) and epsilon-aminocaproic acid (epsilon ACA) and of the cyclic analogs trans-(aminomethyl)-cyclohexanecarboxylic acid (AMCHA) and p-benzylaminesulfonic acid (BASA) to the intact plasminogen kringle 4 domain have been investigated by 1H-NMR spectroscopy at 300 and 600 MHz. Ligand binding results in consistent shifts of the His-II (His31), Trp-I (Trp25?), Trp-II (Trp62?), Trp-III (Trp72), Tyr-II (Tyr50), and Phe64 ring signals. BASA tends to induce larger shifts than elicited by the aliphatic ligands, most noticeably on Trp-II and on Trp72, suggesting that the ligand aromatic ring interacts with the two indole groups. Trp-II and, to lesser extent, Trp-I interact with an acidic side chain group, in a manner that is blocked by BASA. BASA binding also perturbs Tyr-II (Tyr50), Tyr-III (Tyr41), and Tyr-IV (Tyr74) over a wide pH range and lowers the pKa* of His31 from approximately 4.8 to approximately 4.6. His-III (His33) responds to BASA and AMCHA but is relatively insensitive to the linear ligands. His33 carries a sterically shielded side chain which, in conjunction with Leu46, Trp-I, Tyr50, and Tyr74, participates in structuring the kringle hydrophobic core, contiguous to the binding site. Pronounced shifts are observed for aliphatic resonances stemming from the kringle-bound molecules of AMCHA, AcLys, and epsilon ACA. It is proposed that the lysine-binding site is mostly supported by the loop that extends from Cys51 through Cys71 and that aromatic residues, which include Trp-II, Trp72, and Phe64, play a major role in interacting with the nonpolar segment of the ligand molecule. The binding site also encompasses Tyr50, Tyr74, His31, and His33 although it is not clear the extent to which these residues interact directly with the ligand.

journal_name

Arch Biochem Biophys

authors

De Marco A,Laursen RA,Llinas M

doi

10.1016/0003-9861(86)90642-9

subject

Has Abstract

pub_date

1986-02-01 00:00:00

pages

727-41

issue

2

eissn

0003-9861

issn

1096-0384

pii

0003-9861(86)90642-9

journal_volume

244

pub_type

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