Figure 4.
Comparison of the hydrogen-bonding interactions within the linker region. (a) Superposition of active MMP-1 (pink) and procollagenase-1 (green) to highlight the conformational similarity of the linker region in the two structures. (b) Stereo view of the linker region in active MMP-1 showing the hydrogen-bonding interactions between the residues. (c) Stereo view of the linker region in procollagenase-1 showing the hydrogen bonds within the region.