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The function of MAP2K1IP1/MAPKSP1 (MP1;MEK partner-1) a 14kDa scaffold protein, is to bind specifically to MEK1 and ERK1 and bring them in close proximity in order to facilitate their activation. Localized to the late endosome, MAP2K1IP1 also interacts with an adaptor protein p14. While the interaction between MAPKSP1-ERK1 can take place in the absence of the adaptor protein p14, it is strengthened in the presence of p14. Additionally, it has been suggested that the binding of MAP2K1IP1/MAPKSP1 to MEK1 resides in a proline-rich sequence (residue 270-307) of MEK1.