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Transfer of band 3, the erythrocyte anion transporter, between phospholipid vesicles and cells.

Abstract：

:Band 3, the anion transport protein of human erythrocyte membranes, can be transferred from cells to liposomes and from liposomes back to cell membranes, retaining function and native orientation. After incubation with cells, sonicated phosphatidylcholine vesicles bind a transmembrane protein that comigrates with band 3 on sodium dodecyl sulfate-polyacrylamide gels. Like native red cell band 3, the vesicle-bound protein is cleaved by chymotrypsin into 65- and 30-kdalton fragments and is not cleaved by trypsin. The protein can be cross-linked by copper-phenanthroline oxidation either before or after transfer to vesicles; in either case, the vesicle fractions contain high molecular weight material that is dissociated into 95-kdalton species by mercaptoethanol. Band 3-vesicle complexes contain no detectable cell lipid and are specifically permeable to anions. Greater than 99% of their anion uptake can be blocked by the band 3 inhibitor 4,4'-diisothiocyano-2,2'-stilbenedisulfonic acid (DIDS). Red cells whose band 3 function has been blocked irreversibly by DIDS or eosin maleimide regain part of their anion permeability upon incubation with band 3-vesicle complexes. Under the conditions employed, an average of one copy of functional band 3 is delivered to half of the cells, increasing by 2.3-fold the number of cells containing functional anion transporters. Incubation of pure lipid vesicles or red cell membrane buds with either normal red cells or eosin maleimide inhibited cells has no detectable effect on the cells' anion permeability.

journal_name

Biochemistry

journal_title

Biochemistry

authors

Newton AC,Cook SL,Huestis WH

doi

10.1021/bi00295a011

subject

Has Abstract

pub_date

1983-12-20 00:00:00

pages

6110-7

issue

26

eissn

0006-2960

issn

1520-4995

journal_volume

22

pub_type

杂志文章

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