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ID	Property	Organism	Value	Units	Range	Details
102075	Repression of lac promoter in its activated state by wildtype lac repressor	Bacteria Escherichia coli	~1000	Fold		more
102083	Lac repressor concentration	Bacteria Escherichia coli	~1E-08	Molar		more
102077	Frequency of initiation of one transcript from each fully induced or constitutive lac promoter	Bacteria Escherichia coli	1.7	1/sec		more
102084	Binding constant of lac repressor to lac operator	Bacteria Escherichia coli	~1e+9	Molar		more
102073	Activation of lac promoter by CAP protein in presence of cAMP	Bacteria Escherichia coli	50	Fold		more
102085	Percent of lac operator in a free state	Bacteria Escherichia coli	~5	unitless		more
102090	Decrease of repression of lac transcription in absence of both 'pseudo operators'	Bacteria Escherichia coli	>=50	Fold		more
102089	Decrease of repression of lac transcription in absence of one 'pseudo operator'	Bacteria Escherichia coli		Fold	2-3	more
103600	Experimental in vitro Constant for binding of repressor to O3 locus of lac operator	Bacteria Escherichia coli		nM	0.016-1	more
103599	Experimental in vitro Constant for binding of repressor to O2 locus of lac operator	Bacteria Escherichia coli	0.01	nM		more
103598	Experimental in vitro Constant for binding of repressor to O1 locus of lac operator	Bacteria Escherichia coli	1e-3	nM		more
103165	Number of base pairs between Lac operators creating DNA loop with minimum looping energy	Bacteria Escherichia coli	70.5	bp		more
102086	Increase in repression of lac transcription by operator O1 compared to absence of operator	Bacteria Escherichia coli	18	Fold		more
102022	Lac repressor tetramers per cell	Bacteria Escherichia coli	5	tetramer molecules		more
102076	Number of copies of lac operon in average cell which is in process of DNA replication	Bacteria Escherichia coli	~1.7	molecules per cell		more
103603	Constant of repressor binding to auxiliary operator located upstream of the Lac promoter	Bacteria Escherichia coli	0.05	nM		more
103591	Constant for binding of activator CRP to lac promoter activating site	Bacteria Escherichia coli	0.02	nM		more
103601	Constant of repressor binding to O1 Lac operator when repressor creates loop in chromosome	Bacteria Escherichia coli	0.27	nM		more
103602	Concentration of Lac repressor	Bacteria Escherichia coli	50	nM		more
103153	Number of base pairs in loop caused by Lac repressor	Bacteria	92	bp		more


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BioNumbers is in its infancy and there are notable gaps in the available data. Search results often contain false positives. Please suggest missing data and references to help remedy these shortcomings (feedback box on the left). _uacct = "UA-4526009-1" urchinTracker()

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Caution: reported numbers depend upon experimental conditions which are provided as part of the BioNumbers entry.

BioNumbers is in its infancy and there are notable gaps in the available data.
Search results often contain false positives. Please suggest
missing data and references to help remedy these shortcomings (feedback box on the left).

Caution: reported numbers depend upon experimental conditions
which are provided as part of the BioNumbers entry.