Three-dimensional structure of SPE B. A, stereoview of
three-dimensional structures of mSPE B C47S mutant. The α-helix and
β-strands are labeled and presented in red and blue,
respectively. B, superimposition of x-ray and NMR structures of mSPE
B C47S mutant. The x-ray and NMR structures are shown in orange and
light blue, respectively. The S230-G239 region of NMR structure is
shown in purple. C, superimposition of mSPE B and proSPE B structures
of C47S mutant. Only the helix K87p-L107p of prodomain in proSPE B is shown,
and it is colored in black. D, active site region of mSPE B and
proSPE B. The residues Q17, C47/S47, H195, W212, and W214 at the SPE B active
site are shown.