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. 1986 Jul 1;237(1):73–84. doi: 10.1042/bj2370073

A rapid solid-phase protein microsequencer.

J E Walker, I M Fearnley, R A Blows
PMCID: PMC1146949  PMID: 3800890

Abstract

A solid-phase protein microsequencer is described that has been designed to determine protein sequences with subnanomolar quantities of protein. Its utility has been demonstrated by the determination of many sequences in subunits of mitochondrial F1-ATPase, in a protein isolated from mouse gap junctions and in the mitochondrial phosphate-transporter protein. It has a number of advantages over liquid- and gas-phase sequencers. Firstly, the degradation cycle takes 24 min, more than twice as fast as any other sequencer. This helps to reduce exposure of proteins to inimical reagents and increases throughput of samples. Secondly, polar amino acids such as phosphoserine, and polar derivatives formed by active-site photoaffinity labelling with 8-azido-ATP, are recovered quantitatively from the reaction column and can be positively identified. In other types of sequencer these polar derivatives, being somewhat insoluble in butyl chloride, tend to remain in the reaction chamber of the instrument and so are more difficult to identify. The solid-phase protein sequencer is also more suited than the liquid-phase instrument for analysis of proteolipids from membranes. These hydrophobic proteins tend to dissolve in organic solvents during washing steps in the liquid-phase instrument and are lost. Covalent attachment as used in the solid-phase instrument solves this problem.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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