Open AccessPurification and Partial Characterization of a Major Outer-membrane Protein of Fusobacterium nucleatum
Author(s) -
Vidar Bakken,
Stig Aarø,
Harald B. Jensen
Publication year - 1989
Publication title -
microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.019
H-Index - 179
eISSN - 1465-2080
pISSN - 1350-0872
DOI - 10.1099/00221287-135-12-3253
Subject(s) - fusobacterium nucleatum , gel electrophoresis , bacterial outer membrane , biochemistry , trypsin , pronase , polyacrylamide gel electrophoresis , peptide sequence , amino acid , biology , chymotrypsin , gel electrophoresis of proteins , membrane protein , proteolytic enzymes , chemistry , bacteria , microbiology and biotechnology , enzyme , membrane , escherichia coli , gene , genetics , porphyromonas gingivalis
The major outer-membrane proteins of 40-41 kDa were identified by sodium dodecyl sulphate polyacrylamide gel electrophoresis (SDS-PAGE) in Fusobacterium nucleatum strains ATCC 10953, ATCC 25586, F3, F6 and Fev1. The proteins were purified by preparative gel electrophoresis. Their behaviour in gel filtration and gel electrophoresis, their sensitivity to proteolytic enzymes, and their amino acid composition were investigated. The purified proteins were partly sequenced from the N-terminal end. A 36.5 kDa portion was protected against extrinsic proteolytic (trypsin, chymotrypsin or pronase) digestion of whole cells. This polypeptide was isolated and partially sequenced from the N-terminal end. From these data and data from extrinsic iodination it was concluded that the N-terminal end of the protein is probably exposed on the surface of the cell. A database search revealed amino acid sequence similarity in an Ala-Pro-rich region of outer-membrane protein A (OmpA) in other Gram-negative bacteria.