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Alkaline proteins of Bacillus subtilis: First steps towards a two‐dimensional alkaline master gel
Author(s) -
Ohlmeier Steffen,
Scharf Christian,
Hecker Michael
Publication year - 2000
Publication title -
electrophoresis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.666
H-Index - 158
eISSN - 1522-2683
pISSN - 0173-0835
DOI - 10.1002/1522-2683(200011)21:17<3701::aid-elps3701>3.0.co;2-5
Subject(s) - bacillus subtilis , proteome , isoelectric point , isoelectric focusing , two dimensional gel electrophoresis , chromatography , chemistry , gel electrophoresis , biochemistry , biology , bacteria , enzyme , proteomics , gene , genetics
The genomic sequence of Bacillus subtilis , which is the best studied Gram‐positive bacterium, enabled us to obtain a theoretical two‐dimensional (2‐D) map, demonstrating that about one‐third of this proteome has a theoretical alkaline isoelectric point (p I ). This represents an important part of the entire proteome, which is not detectable in conventional 2‐D gels (pH range 4—7). Sequence analysis revealed that 91% of the ribosomal proteins and a high amount of theoretical membrane proteins should be localized in the alkaline pH range requiring different protein extraction procedures. In order to find the pH range which gives the best resolution results for the alkaline proteins of B. subtilis , immobilized pH gradients (IPGs) with different pH ranges (pH 6—10, 6—11, 4—12, 9—12, and 3—10) were tested and optimized for IPG 4—12. Here we present a version of a first alkaline master 2‐D gel for B. subtilis , which is a further complement of the already existing master gel (pH 4—7) in the Sub2D database. Almost 150 spots could be detected and 41 proteins have already been identified.