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. 2015 Aug 3;6:567. doi: 10.3389/fpls.2015.00567

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Copyright © 2015 Forlani, Makarova, Ruszkowski, Bertazzini and Nocek.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Secondary structure of a typical P5CR enzyme. (A) A diagram showing architecture of monomer of HsP5CR (PDB id: 2IZZ). Parts of protein interacting with NAD are colored in cyan (A), red and green (B) and blue (C), while substrate (P5C, 1-pyrroline-5-carboxylic acid) pocket is colored in magenta (E). In addition, regions with highly conserved sequence are highlighted in orange. Secondary structure elements are labeled with numbers. (B) A dimer architecture of HsP5CR, revealing the basic biological unit utilized by the P5CR family showing a proper active site arrangement with motifs C, E, and D (the hinge region motif) positioned closely.