Determination of the cleavage sites in SulA, a cell division inhibitor, by the ATP-dependent HslVU protease from Escherichia coli.
HslVU is an ATP-dependent protease from Escherichia coli and known to degrade SulA, a cell division inhibitor, both in vivo and in vitro, like the ATP-dependent protease Lon. In this study, the cleavage specificity of HslVU toward SulA was investigated. The enzyme was shown to produce 58 peptides with various sizes (3-31 residues), not following the 'molecular ruler' model. Cleavage occurred at 39 peptide bonds preferentially after Leu in an ATP-dependent manner and in a processive fashion. Interestingly, the central and C-terminal regions of SulA, which are known to be important for the function of SulA, such as inhibition of cell division and molecular interaction with certain other proteins, were shown to be preferentially cleaved by HslVU, as well as by Lon, despite the fact that the peptide bond specificities of the two enzymes were distinct from each other.
School of Life Science, Tokyo University of Pharmacy and Life Science, 1432-1 Horinouchi, Hachioji, 192-0392 Tokyo, Japan.
Wataru
W
Nishii
Kenji
K
Takahashi
D049069:ATP-Dependent Proteases; D000595:Amino Acid Sequence; D001665:Binding Sites; D002455:Cell Division / Q000502:physiology; D004591:Electrophoresis, Polyacrylamide Gel; D004926:Escherichia coli / Q000201:enzymology*; D029968:Escherichia coli Proteins / Q000737:chemistry / Q000378:metabolism* / Q000494:pharmacology; D005934:Glucagon / Q000378:metabolism; D006360:Heat-Shock Proteins / Q000235:genetics / Q000378:metabolism*; D008969:Molecular Sequence Data; D010446:Peptide Fragments / Q000032:analysis; D010455:Peptides / Q000737:chemistry / Q000378:metabolism; D049070:Protease La; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism; D012697:Serine Endopeptidases / Q000235:genetics / Q000378:metabolism*
D029968:Escherichia coli Proteins; D006360:Heat-Shock Proteins; D010446:Peptide Fragments; D010455:Peptides; D011994:Recombinant Proteins; C053139:sulA protein, E coli; D005934:Glucagon; D049069:ATP-Dependent Proteases; D012697:Serine Endopeptidases; C483567:Lon protein, E coli; D049070:Protease La