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. 2020 Nov 11;10:19570. doi: 10.1038/s41598-020-76172-5

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Overall structure of bromelain and ananain. (a) Cartoon representation of superimposed bromelain (L domain blue and R domain green) and ananain (gray) structures; important catalytic residues and disulfide bonds are represented as sticks. (b) Sticks representation of two different residues (serine and proline) in alternate conformations observed at position 210 of molecule B. 2Fo-Fc electron density map is displayed at a 1σ level. The water molecule shown is only concomitant with the S210 alternate conformation. (c) Sticks representation of the glycosylation of Asn117, 2Fo-Fc electron density map is also displayed at a 1σ level. (d) Surface representation of bromelain, residues forming pocket 1 and pocket 2 are shown as sticks in transparency.