Cartoon diagram of <a href="https://en.wikipedia.org/wiki/actinidain" class="extiw" title="w:actinidain">actinidain</a>, a <a href="https://en.wikipedia.org/wiki/cysteine_protease" class="extiw" title="w:cysteine protease">cysteine protease</a> from <i><a href="https://en.wikipedia.org/wiki/Actinidia_chinensis" class="extiw" title="w:Actinidia chinensis">Actinidia chinensis</a></i>, in complex with an <a href="https://en.wikipedia.org/wiki/enzyme_inhibitor" class="extiw" title="w:enzyme inhibitor">inhibitor</a> (not shown).<br>Created using <a href="https://en.wikipedia.org/wiki/PyMOL" class="extiw" title="w:PyMOL">PyMOL</a> (<a rel="nofollow" class="external free" href="http://www.pymol.org">http://www.pymol.org</a>) and <a href="https://en.wikipedia.org/wiki/GIMP" class="extiw" title="w:GIMP">GIMP</a>.
<a href="//commons.wikimedia.org/wiki/User:Fvasconcellos" title="User:Fvasconcellos">Fvasconcellos</a> (<a href="//commons.wikimedia.org/wiki/User_talk:Fvasconcellos" title="User talk:Fvasconcellos">talk</a><span style="white-space:nowrap"> <b>·</b></span> <a href="//commons.wikimedia.org/wiki/Special:Contributions/Fvasconcellos" title="Special:Contributions/Fvasconcellos">contribs</a>)
<p>From <a href="https://en.wikipedia.org/wiki/Protein_Data_Bank" class="extiw" title="w:Protein Data Bank">PDB</a> <a rel="nofollow" class="external text" href="http://www.rcsb.org/pdb/cgi/explore.cgi?pdbId=1AEC">1AEC</a>.
More information:
</p>
<ul><li><cite style="font-style:normal">Varughese KI, Su Y, Cromwell D, Hasnain S, Xuong NH (June 1992). "Crystal structure of an actinidin-E-64 complex". <i>Biochemistry</i> <b>31</b> (22): 5172–6. <a class="external mw-magiclink-pmid" rel="nofollow" href="//www.ncbi.nlm.nih.gov/pubmed/1606141?dopt=Abstract">PMID 1606141</a>.</cite></li></ul>