A new method for rapid assignment of S-S bridges in proteins.

Abstract:

:A new method for complementing existing protein chemical techniques for the assignment of S-S bridge positions in amino-acid sequences is described. The principle of the method is the direct examination of the masses of protein fragments, obtained by chemical or enzymatic degradation. Proteins are digested under conditions known to minimise disulphide reduction and reshuffling, and the unfractionated digest is examined directly by high field magnet (or other high mass) fast atom bombardment or Californium mass spectrometry. Disulphide linked peptides are identified from their unique masses, and by comparison with the spectrum of digested and reduced samples in which the signal corresponding to the S-S linked peptide(s) is replaced by two signals corresponding to the respective thiol peptide components, if INTER-bridged, or shifted by two mass units (dithiol) if INTRA-bridged. This rapid procedure has considerable potential in assisting with studies on the primary structure of proteins, in crystallographic studies and the monitoring of denaturation/renaturation of recombinant proteins.

authors

Morris HR,Pucci P

doi

10.1016/0006-291x(85)90302-x

subject

Has Abstract

pub_date

1985-02-15 00:00:00

pages

1122-8

issue

3

eissn

0006-291X

issn

1090-2104

pii

0006-291X(85)90302-X

journal_volume

126

pub_type

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