SOS box
Encyclopedia
SOS box is the region in the promoter of various gene
s to which the LexA
repressor
binds to repress the transcription
in the absence of DNA damage.
See Nucleic acid nomenclature
for an explanation of non-GATC nucleotide letters
Gene
A gene is a molecular unit of heredity of a living organism. It is a name given to some stretches of DNA and RNA that code for a type of protein or for an RNA chain that has a function in the organism. Living beings depend on genes, as they specify all proteins and functional RNA chains...
s to which the LexA
Lexa
Lexa:* Lexa Pierce* Repressor lexA - Place name :* Lexa, Arkansas, a city in Phillips County, United StatesLexa means aborigional or native according to the dictionary.- Family name :* the House of Lexa , Lexa von Aehrenthal:...
repressor
Repressor
In molecular genetics, a repressor is a DNA-binding protein that regulates the expression of one or more genes by binding to the operator and blocking the attachment of RNA polymerase to the promoter, thus preventing transcription of the genes. This blocking of expression is called...
binds to repress the transcription
Transcription (genetics)
Transcription is the process of creating a complementary RNA copy of a sequence of DNA. Both RNA and DNA are nucleic acids, which use base pairs of nucleotides as a complementary language that can be converted back and forth from DNA to RNA by the action of the correct enzymes...
in the absence of DNA damage.
Examples
| Phylogenetic Clade | Sequence | Reference |
|---|---|---|
| Alpha Proteobacteria | GAAC(N)7GAAC GTTC(N)7GTTC |
|
| Betaproteobacteria Gammaproteobacteria |
CTGT(N)8ACAG | |
| Deltaproteobacteria | CTRHAMRYBYGTTCAGS | |
| Gram-positive Bacteria Gram-positive Gram-positive bacteria are those that are stained dark blue or violet by Gram staining. This is in contrast to Gram-negative bacteria, which cannot retain the crystal violet stain, instead taking up the counterstain and appearing red or pink... |
CGAACRNRYGTTYC | |
| Cyanobacteria | RGTAC(N)3DGTWCB |
See Nucleic acid nomenclature
Nucleic acid nomenclature
Molecular biologists use several shorthand terms when referring to nucleic acid molecules, such as DNA and RNA, collectively referred to as nucleic acid nomenclature....
for an explanation of non-GATC nucleotide letters