tetrabrachion

noun1

1. •
   A highly thermostable surface protein, of unusual structure, isolated from an archaebacterium.

   • The cytoplasmic (CD), tetramerization (TM) and stalk domains of the WT NA were replaced by an Ig-k secretion sequence, a 6xHis-tag, and a tetrabrachion domain for protein tetramerization. — 2015