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three families, cbSTKI, cbSTKII and cbSTKIII. Their structure and distribution among the sequenced
genomes is presented in Fig. 14. In
M
.
aeruginosa
NIES-843 there are 22 genes for histidine kinases
and 23 genes for response regulator. Two genes of histidine kinases (designated as MAE46010) and
two genes for hybrid histidine kinases (designated as MAE21690 and MAE37480) are reported to
be unique. Five sets of histidine kinases and response regulators have been found adjacent to each
other while the rest of them are found scattered throughout the chromosome. According to Kaneko
et al
. (2008) fi ve genes of histidine kinases (those found in
M
.
aeruginosa
NIES-843) designated as
MAE03210 (
hik34
), MAE14410 (
hik2
), MAE36080 (
hik33
), MAE 52650 (
SphS
) and MAE 60820 (
sasA
)
are well conserved in all cyanobacterial genomes sequenced to date. Frangeul
et al
. (2008) identifi ed
genes coding for a Ser/Thr kinase (
mic0129
) and a Ser/Thr phosphatase of the PPP family (
mic4622
)
within two clusters that may be involved in cell wall synthesis in
M
.
aeruginosa
PCC 7806. Swingley
et al
. (2008) reported the existence of 170 genes in
A
.
marina
MBIC11017 assigned to two-component
regulatory system consisting of sensory histidine kinases and response regulators.
Figure 14:
Schematic representation and distribution of putative cyanobacterial serine/threonine protein kinases. Strain
names are as in Figure 13. With the kind permission of S. Qin, Ocean University of China, Yushan Road, Qingdao, China
[Zhang X.
et al
. (2007)
BMC Genomics
8:
395; doi:10.1186/1471-2164-8-395].
Color image of this figure appears in the color plate section at the end of the topic.
