SepZ is a component of the type III secretion system use in bacteria. SepZ is a gene within the enterocyte effacement locus. SepZ mutants exhibit reduced invasion efficiency and lack of tyrosine phosphorylation of Hp90 [1].

1: Attaching and effacing of host cells by enteropathogenic Escherichia coli in the absence of detectable tyrosine kinase mediated signal transduction. Rabinowitz RP, Lai LC, Jarvis K, McDaniel TK, Kaper JB, Stone KD, Donnenberg MS; Microb Pathog 1996;21:157-171. PMID:8878013