The extracellular portion of HLA-DR alpha chain is composed of two compactly folded domains.

Abstract:

:A truncated form of the class II antigen DR alpha chain of the human major histocompatibility complex was produced in bacteria. A cDNA clone encoding the intact chain was modified so that the segment encoding the signal sequence was replaced by an ATG codon and the 3' region downstream to the part corresponding to the third exon was replaced by a stop codon. The new construct was put under the control of the Tac promoter in a bacterial expression vector. The distance between the Shine-Delgarno sequence and the initiation codon was randomized so that clones with optimal expression of the truncated DR alpha chain could be obtained after induced expression and immunoscreening. The truncated DR alpha chain was subjected to limited proteolysis with chymotrypsin, and the resulting cleavage products were analysed by sodium dodecyl sulphate-polyacrylamide gel electrophoresis. Two fragments were visualized by western blotting. Electrophoresis in the absence and presence of reducing agents suggested that one of the proteolytic fragments contained a disulphide bridge. It is concluded that the extracellular portion of the DR alpha chain is composed of two compactly folded domains connected by an extended stretch of the polypeptide chain.

journal_name

Scand J Immunol

authors

Bill P,Lind P,Rask L,Peterson PA

doi

10.1111/j.1365-3083.1987.tb02259.x

subject

Has Abstract

pub_date

1987-09-01 00:00:00

pages

255-65

issue

3

eissn

0300-9475

issn

1365-3083

journal_volume

26

pub_type

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