Regulatory
OmpR

Part:BBa_R0083

Designed by: Stephen Lee, Roshan Kumar, Joe Levine, Ziyan Chu (Polkadorks, IAP 2004)   Group: Antiquity   (2004-01-27)


Promoter (OmpR, positive)

Positively regulated, OmpR-controlled promoter. This promoter is derived from the upstream region of ompC. Phosphorylated OmpR binds to the operator site and activates transcription. This is a truncated version of BBa_R0082.


Usage and Biology

This promoter contains upstream regions of the ompC porin gene. The regulation of ompC is determined by the EnvZ-OmpR osmosensing machinery. EnvZ phosphorylates OmpR to OmpR-P. At high osmolarity, EnvZ is more active, creating more OmpR-P. OmpR-P then binds to the low-affinity OmpR operator sites upstream of ompC.

Activation of ompC has been experimentally shown to occur with just the C1 OmpR binding region, provided that the C1 region is placed next to the -35 signal (Maeda and Mizuno, 1990). This promoter is a truncated version of BBa_R0082, which contains C1, C2, and C3.


Sequence and Features


Assembly Compatibility:
  • 10
    COMPATIBLE WITH RFC[10]
  • 12
    COMPATIBLE WITH RFC[12]
  • 21
    COMPATIBLE WITH RFC[21]
  • 23
    COMPATIBLE WITH RFC[23]
  • 25
    COMPATIBLE WITH RFC[25]
  • 1000
    COMPATIBLE WITH RFC[1000]



Functional Parameters: Austin_UTexas

BBa_R0083 parameters

Burden Imposed by this Part:

Burden Value: 5.8 ± 7.0%

Burden is the percent reduction in the growth rate of E. coli cells transformed with a plasmid containing this BioBrick (± values are 95% confidence limits). This BioBrick did not exhibit a burden that was significantly greater than zero (i.e., it appears to have little to no impact on growth). Therefore, users can depend on this part to remain stable for many bacterial cell divisions and in large culture volumes. Refer to any one of the BBa_K3174002 - BBa_K3174007 pages for more information on the methods, an explanation of the sources of burden, and other conclusions from a large-scale measurement project conducted by the 2019 Austin_UTexas team.

This functional parameter was added by the 2020 Austin_UTexas team.

[edit]
Categories
//rnap/prokaryote/ecoli/sigma70
//direction/forward
//chassis/prokaryote/ecoli
//promoter
//regulation/positive
//classic/regulatory/uncategorized
Parameters
biology
directionForward
negative_regulators
positive_regulators1