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. 2001 Dec 1;106(6):1155–1173. doi: 10.6028/jres.106.062

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The Journal of Research of the National Institute of Standards and Technology is a publication of the U.S. Government. The papers are in the public domain and are not subject to copyright in the United States. Articles from J Res may contain photographs or illustrations copyrighted by other commercial organizations or individuals that may not be used without obtaining prior approval from the holder of the copyright.

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Fig. 3 — The 1.8 Å structure of engineered subtilisin BPN from Bacillus amyloliquefaciens that removed the calcium-binding loop associated with site A. (PDB entry 1sub) [3]. The backbone fold is shown with the α-helix and β-strand secondary structure elements are shown as tightly coiled ribbons and arrows, respectively.