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All three LDL receptor homology regions of the LDL receptor-related protein bind multiple ligands.

Abstract：

:The three complete human LDL receptor homology regions of the LDL receptor-related protein (sLRP2, sLRP3, and sLRP4) have been expressed in Pichia pastoris SMD1168 with constitutive coexpression of the receptor-associated protein (RAP). Each sLRP was purified to homogeneity after deglycosylation using a combination of anion-exchange and size exclusion chromatography. Mass spectrometry and N-terminal sequencing confirmed the identity of each fragment at purified yields of several milligrams per liter. Despite the large number of disulfide linkages and glycosylation sites in each LDL receptor homology region (sLRP), all were shown to be competent for binding to several LRP1 ligands. Each sLRP also bound human RAP, which is thought to be a generalized receptor antagonist, in solution-binding experiments. As expected, sLRP2 bound the receptor-binding domain of alpha(2)-macroglobulin (residues 1304-1451). All three sLRPs bound human apolipoprotein-enriched beta very low density lipoprotein, the canonical ligand for this receptor. All three sLRPs also bound lactoferrin and thrombin-protease nexin 1 complexes. Only sLRP4 bound thrombin-antithrombin III complexes. The results show that binding-competent LDL receptor homology regions (sLRPs) can be produced in high yield in P. pastoris and readily purified. Each sLRP has binding sites for multiple ligands, but not all ligand binding could be competed by RAP.

journal_name

Biochemistry

journal_title

Biochemistry

authors

Croy JE,Shin WD,Knauer MF,Knauer DJ,Komives EA

doi

10.1021/bi034752s

subject

Has Abstract

pub_date

2003-11-11 00:00:00

pages

13049-57

issue

44

eissn

0006-2960

issn

1520-4995

journal_volume

42

pub_type

杂志文章

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