Na+K+-ATPase-specific peptide inhibitors/activators of SRC and SRC family kinases
A method for regulating Src and its downstream signaling pathway which includes binding between Src and Na+/K+-ATPase is disclosed. The Na+/K+-ATPase/Src complex is a functional receptor for cardiotonic steroids such as ouabain. Also disclosed are Src inhibitors or activators which include either Na+/K+-ATPase or Src that interfere with the interaction between the Na/K-ATPase and Src, act via a different mechanism from ATP analogues, and is pathway (Na+/K+-ATPase) specific.
1. A peptide comprising a helix or helix-like structure that binds to Src kinase domain, wherein the peptide is identified based on the helix structure of P3 consisting of SEQ ID NO:2.
2. A therapeutic composition comprising the peptide of claim 1 .
3. A conjugate comprising the peptide of claim 1 and at least one cell penetration leader peptide selected from one or more of: penetratin (TAT) (SEQ ID NO:47), antennapedia (AP) (SEQ ID NO:48), or functionally active fragments thereof.
4. A therapeutic composition comprising at least one conjugate of claim 3 .
5. A peptide comprising SEQ ID NO:49, which consists of SEQ ID NO: 47 conjugated to SEQ ID NO: 2.
6. A peptide comprising SEQ ID NO:50, which consists of SEQ ID NO: 48 conjugated to SEQ ID NO: 2.