Open AccessAn Agarose‐Based Gel‐Concentration System for Microsequence and Mass Spectrometric Characterization of Proteins Previously Purified in Polyacrylamide Gels Starting at Low Picomole Levels
Author(s) -
Rider Mark H.,
Puype Magda,
Damme Jozef,
Gevaert Kris,
Boeck Stefan,
D'Alayer Jacques,
Rasmussen Hanna H.,
Celis Julio E.,
Vandekerckhove Joel
Publication year - 1995
Publication title -
european journal of biochemistry
Language(s) - English
Resource type - Journals
eISSN - 1432-1033
pISSN - 0014-2956
DOI - 10.1111/j.1432-1033.1995.0258i.x
Subject(s) - chromatography , agarose , chemistry , peptide , peptide mass fingerprinting , mass spectrometry , polyacrylamide gel electrophoresis , proteases , polyacrylamide , electrospray , molecular mass , biochemistry , proteomics , enzyme , polymer chemistry , gene
An agarose‐based concentration gel system is described for eluting and concentrating proteins previously purified either in one‐dimensional or two‐dimensional gels. Using the technique, proteins can be concentrated from about 1 ml into volumes as small as 10 μl. After the proteins have been melted out of the agarose gels, they can be digested with proteases, producing peptide patterns similar to those observed with in‐solution digestions. The overall peptide recovery, calculated from the amount of protein loaded on the primary separating gel to the collection of fragments after HPLC, is at least 70% of the peptide yields obtained with digests of the same amount of protein in free solution. These results are routinely obtained with 50 pmol amounts (referring to amounts of protein initially loaded on the primary gel). Proteins can also be analysed by a combination of microsequencing and on‐line electrospray mass spec‐trometry, allowing their identification by peptide mass fingerprinting.