Circadian Rhythmicity by Autocatalysis

The temperature compensated in vitro oscillation of cyanobacterial KaiC phosphorylation, the first example of a thermodynamically closed system showing circadian rhythmicity, only involves the three Kai proteins (KaiA, KaiB, and KaiC) and ATP. In this paper, we describe a model in which the KaiA- an...

Descripción completa

Detalles Bibliográficos
Autores principales: Mehra, Arun, Hong, Christian I, Shi, Mi, Loros, Jennifer J, Dunlap, Jay C, Ruoff, Peter
Formato: Texto
Lenguaje:English
Publicado: Public Library of Science 2006
Materias:
Research Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1523307/
https://www.ncbi.nlm.nih.gov/pubmed/16863394
http://dx.doi.org/10.1371/journal.pcbi.0020096
Descripción
Sumario:The temperature compensated in vitro oscillation of cyanobacterial KaiC phosphorylation, the first example of a thermodynamically closed system showing circadian rhythmicity, only involves the three Kai proteins (KaiA, KaiB, and KaiC) and ATP. In this paper, we describe a model in which the KaiA- and KaiB-assisted autocatalytic phosphorylation and dephosphorylation of KaiC are the source for circadian rhythmicity. This model, based upon autocatalysis instead of transcription-translation negative feedback, shows temperature-compensated circadian limit-cycle oscillations with KaiC phosphorylation profiles and has period lengths and rate constant values that are consistent with experimental observations.

Ejemplares similares