Non-optimal codon usage is a mechanism to achieve circadian clock conditionality. Xu Y, Ma P, Shah P, Rokas A, Liu Y, Johnson CH (2013) Nature 495: 116-20 Structural insights into a circadian oscillator. Johnson CH, Egli M, Stewart PL (2008) Science 322: 697-701 Metabolic compensation and circadian resilience in prokaryotic cyanobacteria. Johnson CH, Egli M (2014) Annu Rev Biochem 83: 221-47 Visualizing a circadian clock protein: crystal structure of KaiC and functional insights. Pattanayek R, Wang J, Mori T, Xu Y, Johnson CH, Egli M (2004) Mol Cell 15: 375-88 An arginine tetrad as mediator of input-dependent and input-independent ATPases in the clock protein KaiC. Pattanayek R, Xu Y, Lamichhane A, Johnson CH, Egli M (2014) Acta Crystallogr D Biol Crystallogr 70: 1375-90 Circadian programs in cyanobacteria: adaptiveness and mechanism. Johnson CH, Golden SS (1999) Annu Rev Microbiol 53: 389-409 Cyanobacterial circadian clockwork: roles of KaiA, KaiB and the kaiBC promoter in regulating KaiC. Xu Y, Mori T, Johnson CH (2003) EMBO J 22: 2117-26 Structural model of the circadian clock KaiB-KaiC complex and mechanism for modulation of KaiC phosphorylation. Pattanayek R, Williams DR, Pattanayek S, Mori T, Johnson CH, Stewart PL, Egli M (2008) EMBO J 27: 1767-78 Analysis of KaiA-KaiC protein interactions in the cyano-bacterial circadian clock using hybrid structural methods. Pattanayek R, Williams DR, Pattanayek S, Xu Y, Mori T, Johnson CH, Stewart PL, Egli M (2006) EMBO J 25: 2017-28 Circadian clock-protein expression in cyanobacteria: rhythms and phase setting. Xu Y, Mori T, Johnson CH (2000) EMBO J 19: 3349-57 Identification of key phosphorylation sites in the circadian clock protein KaiC by crystallographic and mutagenetic analyses. Xu Y, Mori T, Pattanayek R, Pattanayek S, Egli M, Johnson CH (2004) Proc Natl Acad Sci U S A 101: 13933-8 A bioluminescence resonance energy transfer (BRET) system: application to interacting circadian clock proteins. Xu Y, Piston DW, Johnson CH (1999) Proc Natl Acad Sci U S A 96: 151-6 Circadian clock protein KaiC forms ATP-dependent hexameric rings and binds DNA. Mori T, Saveliev SV, Xu Y, Stafford WF, Cox MM, Inman RB, Johnson CH (2002) Proc Natl Acad Sci U S A 99: 17203-8 Intermolecular associations determine the dynamics of the circadian KaiABC oscillator. Qin X, Byrne M, Mori T, Zou P, Williams DR, McHaourab H, Johnson CH (2010) Proc Natl Acad Sci U S A 107: 14805-10 Circadian yin-yang regulation and its manipulation to globally reprogram gene expression. Xu Y, Weyman PD, Umetani M, Xiong J, Qin X, Xu Q, Iwasaki H, Johnson CH (2013) Curr Biol 23: 2365-74 Circadian clock gene Bmal1 is not essential; functional replacement with its paralog, Bmal2. Shi S, Hida A, McGuinness OP, Wasserman DH, Yamazaki S, Johnson CH (2010) Curr Biol 20: 316-21 CryoEM and molecular dynamics of the circadian KaiB-KaiC complex indicates that KaiB monomers interact with KaiC and block ATP binding clefts. Villarreal SA, Pattanayek R, Williams DR, Mori T, Qin X, Johnson CH, Egli M, Stewart PL (2013) J Mol Biol 425: 3311-24 Combined SAXS/EM based models of the S. elongatus post-translational circadian oscillator and its interactions with the output His-kinase SasA. Pattanayek R, Williams DR, Rossi G, Weigand S, Mori T, Johnson CH, Stewart PL, Egli M (2011) PLoS One 6: e23697 Intramolecular regulation of phosphorylation status of the circadian clock protein KaiC. Xu Y, Mori T, Qin X, Yan H, Egli M, Johnson CH (2009) PLoS One 4: e7509 Structures of KaiC circadian clock mutant proteins: a new phosphorylation site at T426 and mechanisms of kinase, ATPase and phosphatase. Pattanayek R, Mori T, Xu Y, Pattanayek S, Johnson CH, Egli M (2009) PLoS One 4: e7529 Precise circadian clocks in prokaryotic cyanobacteria. Johnson CH (2004) Curr Issues Mol Biol 6: 103-10 Crystal structure of the redox-active cofactor dibromothymoquinone bound to circadian clock protein KaiA and structural basis for dibromothymoquinone's ability to prevent stimulation of KaiC phosphorylation by KaiA. Pattanayek R, Sidiqi SK, Egli M (2012) Biochemistry 51: 8050-2 Dephosphorylation of the core clock protein KaiC in the cyanobacterial KaiABC circadian oscillator proceeds via an ATP synthase mechanism. Egli M, Mori T, Pattanayek R, Xu Y, Qin X, Johnson CH (2012) Biochemistry 51: 1547-58 Loop-loop interactions regulate KaiA-stimulated KaiC phosphorylation in the cyanobacterial KaiABC circadian clock. Egli M, Pattanayek R, Sheehan JH, Xu Y, Mori T, Smith JA, Johnson CH (2013) Biochemistry 52: 1208-20 No promoter left behind: global circadian gene expression in cyanobacteria. Woelfle MA, Johnson CH (2006) J Biol Rhythms 21: 419-31 Independence of circadian timing from cell division in cyanobacteria. Mori T, Johnson CH (2001) J Bacteriol 183: 2439-44
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