Circadian programs in cyanobacteria: Adaptiveness and mechanism

Citation
Ch. Johnson et Ss. Golden, Circadian programs in cyanobacteria: Adaptiveness and mechanism, ANN R MICRO, 53, 1999, pp. 389-409
Citations number
59
Language
INGLESE
art.tipo
Review
Categorie Soggetti
Microbiology
Journal title
ANNUAL REVIEW OF MICROBIOLOGY
ISSN journal
0066-4227 → ACNP
Volume
53
Year of publication
1999
Pages
389 - 409
Database
ISI
SICI code
0066-4227(1999)53:<389:CPICAA>2.0.ZU;2-P
Abstract
At least one group of prokaryotes is known to have circadian regulation of cellular activities-the cyanobacteria. Their "biological clock" orchestrate s cellular events to occur in an optimal temporal program, and it can keep track of circadian time even when the cells are dividing more rapidly than once per day. Growth competition experiments demonstrate that the fitness o f cyanobacteria is enhanced when the circadian period matches the period of the environmental cycle. Three genes have been identified that specificall y affect circadian phenotypes. These genes, kaiA, kaiB, and kaiC, are adjac ent to each ether on the chromosome, thus forming a clock gene cluster. The clock gene products appear to interact with each other and form an autoreg ulatory feedback loop.