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basic tilted helix bundle (BTHB) domain found in HECT domain-containing protein 1 (HectD1) and similar proteins HectD1, also called E3 ligase for inhibin receptor (EULIR), is a Hect-type E3 ubiquitin transferase which accepts ubiquitin from an E2 ubiquitin-conjugating enzyme in the form of a thioester and then directly transfers the ubiquitin to targeted substrates. HectD1 is required for development of head mesenchyme and neural tube closure.
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