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Figure 1.
Fig. 1. Structural alignment of SPRK, PRK and VPRK.
Helices (red tubes) and sheets (yellow arrows) are according to
SPRK. Residues belonging to the S1 site are shaded blue and
residues belonging to the S4 site are shaded light blue.
*represents residues that are involved both in the S1 and S4
sites. Residues forming the calcium binding site found in SPRK
(and VPRK) are shaded green, residues forming the ‘strong’
calcium binding site in PRK (and in VPRK) are shaded khaki, and
residues forming the calcium sites unique for either PRK or VPRK
are shaded pale green.
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