当前位置： SCI文献检索 > BIOCHEMISTRY期刊下所有文献 > Detergent solubilization of the endocytic Ca(2+)-independent hyaluronan receptor from rat liver endothelial cells and separation from a Ca(2+)-dependent hyaluronan-binding activity.

Detergent solubilization of the endocytic Ca(2+)-independent hyaluronan receptor from rat liver endothelial cells and separation from a Ca(2+)-dependent hyaluronan-binding activity.

Abstract：

:Rat liver sinusoidal endothelial cells (LECs) mediate the removal of hyaluronan (HA) from the circulation via a specific Ca(2+)-independent endocytic receptor. To characterize the receptor biochemically, detergent-soluble extracts were prepared from crude LEC membranes. Using a dot blot assay to quantitate 125I-HA binding activity in CHAPS-solubilized membranes, we detected not only specific Ca(2+)-independent but also specific Ca(2+)-dependent HA-binding activity. Both HA-binding activities behave as integral membrane-associated proteins; they are not released from LEC membranes by treatment at pH 11, and they require detergent for extraction. The Ca(2+)-independent HA receptor was inactivated by treatment at 56 degrees C for 30 min or with 200 mM DTT at 4 degrees C for 30 min, whereas the Ca(2+)-dependent activity actually increased by 75% after treatment at 56 degrees C and only 20% of the Ca(2+)-dependent activity was lost after DTT treatment. A two-cycle membrane extraction protocol using CHAPS partially separated the two HA-binding activities. Eight millimolar KCl and 0.5% CHAPS extracted approximately 50% of the Ca(2+)-independent HA receptor, but only 4-11% of the Ca(2+)-dependent activity. When the KCl and CHAPS concentrations were increased to 2.0 M and 1.5%, respectively, the remaining HA receptor, as well as 89-96% of the Ca(2+)-dependent activity, was then extracted. The Ca(2+)-independent and Ca(2+)-dependent activities could also be further separated using Sephacryl S-400 gel filtration chromatography.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

Biochemistry

journal_title

Biochemistry

authors

Yannariello-Brown J,Weigel PH

doi

10.1021/bi00117a039

subject

Has Abstract

pub_date

1992-01-21 00:00:00

pages

576-84

issue

2

eissn

0006-2960

issn

1520-4995

journal_volume

31

pub_type

杂志文章

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