Acts as a central player within a network of stress response pathways promoting cellular adaptability. The E3 ligase HUWE1 assists HAPSTR1 in controlling stress signaling and in turn, HUWE1 feeds back to promote the degradation of HAPSTR1. HAPSTR1 represents a central coordination mechanism for stress response programs (PubMed:35776542). Functions as a negative regulator of TP53/P53 in the cellular response to telomere erosion and probably also DNA damage (PubMed:33660365). May attenuate p53/TP53 activation through the E3 ubiquitin ligase HUWE1 (PubMed:33660365). {ECO:0000269|PubMed:33660365, ECO:0000269|PubMed:35776542}. This is the function of HAPSTR1 (HUWE1 associated protein modifying stress responses, ENSG00000182831).