The β-amyloid precursor protein (β-APP) is a membrane spanning glycoprotein. The small β-protein domain within the precursor is presumed to be the source of amyloid found in plaques characteristic of Alzheimer's disease. The amino terminus of β-APP is released from cells by cleavages that produce both potentially amyloidogenic and nonamyloidogenic fragments of the carboxyl terminus. We developed a cell free system that imposes specificity and co-localization to characterize the proteolytic activity that cleaves the precursor within the β-protein domain. A reporter protein containing the carboxyl-terminal 105 amino acids of β-APP provided a specific substrate for cleavage at Lys16 of the β-protein. The protease inhibitor profile and solubility characteristics of the activity demonstrate the cleavage is produced by an integral membrane metalloendopeptidase.
CITATION STYLE
Roberts, S. B., Ripellino, J. A., Ingalls, K. M., Robakis, N. K., & Felsenstein, K. M. (1994). Non-amyloidogenic cleavage of the β-amyloid precursor protein by an integral membrane metalloendopeptidase. Journal of Biological Chemistry, 269(4), 3111–3116. https://doi.org/10.1016/s0021-9258(17)42055-2
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