The function of CBLL1 (Cbl proto-oncogene like 1, Ensembl gene identifier ENSG00000105879) is as follows. E3 ubiquitin-protein ligase that mediates ubiquitination of several tyrosine-phosphorylated Src substrates, including CDH1, CTTN and DOK1 (By similarity). Targets CDH1 for endocytosis and degradation (By similarity). Associated component of the WMM complex, a complex that mediates N6-methyladenosine (m6A) methylation of RNAs, a modification that plays a role in the efficiency of mRNA splicing and RNA processing (PubMed:29507755). Its function in the WMM complex is unknown (PubMed:29507755). {ECO:0000250|UniProtKB:Q9JIY2, ECO:0000269|PubMed:29507755}.