Synaptic activation protein compositions and method
Disclosed are nucleotide coding sequences and polypeptide sequences for synaptic activation binding proteins that are characterized by induction in the central nervous system following neuronal activity in rat hippocampus. Such proteins are identified by (i) substantial homology at the nucleotide or protein sequence level to specifically defined rat, human or mouse coding sequences or proteins, (ii) ability to bind to and affect the activity of effector proteins in the CNS, such as metabotropic glutamate receptors, (iii) binding specificity for a particular binding sequence, and (iv) presence in the sequence of a PDZ-like domain. Nucleotides and polypeptides of the invention are useful in screening and diagnostic assays.
1. An isolated polypeptide, characterized by (i) presence of a PDZ-like binding domain, and (ii) a sequence that is at least 80% identical to SEQ ID NO:2, wherein the polypeptide exhibits an ability to selectively bind to a synaptic membrane protein having a C-terminal peptide region selected from the group consisting of SSSL (SEQ ID NO: 11) and SSTL (SEQ ID NO: 10).
2. The isolated polypeptide of claim 1 , wherein said polypeptide consists of the sequence as set forth in SEQ ID NO:2.
3. The isolated polypeptide of claim 1 , wherein the synaptic membrane protein is mGluR5 or mGluR1α.