Abstract:
:The main objective of this study was to investigate the biological function of beta amyloid precursor protein (APP), in particular its nerve growth factor-like activity. We hypothesize that the extracellular domain containing the sequence RERMS, amino acids 328-332 of APP(695), represents the active site for this function. Binding assays using peptide fragments of this domain have demonstrated specific and saturable binding to the cell surface with affinity in the low nanomolar range. This induced our quest for an APP-specific receptor. We chose different peptide fragments of the RERMS domain as ligands and displacing agents on affinity columns to purify APP-binding molecules. Amino acid microsequencing yielded partial sequences of serum albumin, actin, two novel proteins of 41 and 63kDa, and human Collapsin Response Mediator Protein-2 (hCRMP-2). Because both APP and hCRMP-2 promote neuronal outgrowth and use a common signaling pathway, APP could be acting through a semaphorin receptor as well.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Pawlik M,Otero DA,Park M,Fischer WH,Levy E,Saitoh Tdoi
10.1016/j.bbrc.2007.02.047subject
Has Abstractpub_date
2007-04-20 00:00:00pages
907-12issue
4eissn
0006-291Xissn
1090-2104pii
S0006-291X(07)00323-3journal_volume
355pub_type
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