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UBA6 (Ubiquitin-like modifier-activating enzyme 6) is also named as MOP4, UBE1L2 and belongs to the ubiquitin-activating E1 family. It probably acts as a single molecule like UBE1 and not as a heterodimeric E1 complex, as formed by AOS1/Uba2 and APP-BP1/Uba3. UBA6 is even more restricted in distribution because it is only found in vertebrates but not in lower organisms so that it might have a specialized role in tissues of higher organisms, and in particular, in the testis, where it is expressed by far most abundantly. and the truncated isoform CRA_b (60-70 kDa) of UBA6 (NCBI).
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