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. 2019 Sep 4;10:2052. doi: 10.3389/fmicb.2019.02052

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Copyright © 2019 Veaudor, Cassier-Chauvat and Chauvat.

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) and the copyright owner(s) 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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Schematic representation of the genes and proteins involved in the formation of the urease in the best-studied cyanobacterium Synechocystis PCC6803. (A) The genes encoding the urease catalytic subunits (UreABC) and the chaperones (UreDEFG) involved in its assembly are represented by large colored arrows indicating the direction of their transcription. The dotted lines and the numbers indicate the length of DNA (in Kb) separating the urease genes. The thin orange arrows stand for the small RNA (see cyanobase) of as yet unknow function. (B) Steps of the urease assembly and maturation process. The nickel ion and the guanoside-5′-triphosphate (GTP) are represented by green dots and orange squares, respectively.