Histidine Triad Nucleotide-binding Protein 1 Up-regulates Cellular Levels of p27 by Targeting Scf Ubiquitin Ligase and Src*

The one or more underlying mechanisms of the tumor suppressing activity of the histidine triad nucleotide-binding protein 1 (HINT1) are not well defined. In this study we found that HINT1 regulates cellular levels of the cyclin-dependent kinase inhibitor p27KIP1 through multiple mechanisms. Increased expression of HINT1 increases cellular levels of p27KIP1, and HINT1 knockdown with small hairpin RNA leads to decreased cellular levels of p27KIP1. HINT1 does not affect the transcription of p27KIP1, but it does inhibit proteasomal degradation of the p27KIP1 protein. HINT1 directly interacts with the SCFSKP2 ubiquitin ligase complex and inhibits the ubiquitylation of p27KIP1. Src has been shown to phosphorylate p27KIP1 and thus decrease its stability. We found that HINT1 is a negative regulator of Src transcription apparently by forming a complex with the transcription factor Sp1 on the promoter of Src. Taken together, our findings indicate thatHINT1up-regulates cellular levels of p27KIP1 by two mechanisms: 1) it inhibits its ubiquitylation by targeting the SCFSKP2 ubiquitin ligase complex, and 2) it inhibits the phosphorylation of p27KIP1 by Src via inhibiting Src expression.