Figure 2.
(A) Ribbon diagram of the hSDH dimer. Green represents the small domain (residues 58–169); purple (residues 1–57) and cyan (residues 170–341) represent the PLP-binding domain. Both domains fold as an open twisted α/β structure consisting of a central β-sheet and surrounding helices. The Lys41 and PLP molecule are shown as ball-and-stick.