IκBα (
nuclear
factor of
kappa light polypeptide gene enhancer in
B-cells
inhibitor
alpha; NFKBIA) is one member of a family of cellular proteins that function to inhibit the
NF-κB
Nuclear factor kappa-light-chain-enhancer of activated B cells (NF-κB) is a family of transcription factor protein complexes that controls transcription (genetics), transcription of DNA, cytokine production and cell survival. NF-κB is found i ...
transcription factor
In molecular biology, a transcription factor (TF) (or sequence-specific DNA-binding factor) is a protein that controls the rate of transcription (genetics), transcription of genetics, genetic information from DNA to messenger RNA, by binding t ...
. IκBα inhibits NF-κB by masking the
nuclear localization signal
A nuclear localization signal ''or'' sequence (NLS) is an amino acid sequence that 'tags' a protein for import into the cell nucleus by nuclear transport. Typically, this signal consists of one or more short sequences of positively charged lysin ...
s (NLS) of NF-κB proteins and keeping them sequestered in an inactive state in the cytoplasm.
In addition, IκBα blocks the ability of NF-κB transcription factors to bind to DNA, which is required for NF-κB's proper functioning.
Disease linkage
The gene encoding the IκBα protein is mutated in some
Hodgkin's lymphoma
Hodgkin lymphoma (HL) is a type of lymphoma in which cancer originates from a specific type of white blood cell called lymphocytes, where multinucleated Reed–Sternberg cells (RS cells) are present in the lymph nodes. The condition was named a ...
cells; such mutations inactivate the IκBα protein, thus causing NF-κB to be chronically active in the lymphoma tumor cells and this activity contributes to the malignant state of these tumor cells.
Interactions
IκBα has been shown to
interact with:
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BTRC,
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C22orf25
Transport and golgi organization 2 homolog (TANGO2) also known as chromosome 22 open reading frame 25 (C22orf25) is a protein that in humans is encoded by the TANGO2 gene.
The function of C22orf25 is not currently known. It is characterized by ...
,
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CHUK
Inhibitor of nuclear factor kappa-B kinase subunit alpha (IKK-α) also known as IKK1 or conserved helix-loop-helix ubiquitous kinase (CHUK) is a protein kinase that in humans is encoded by the ''CHUK'' gene. IKK-α is part of the IκB kinase c ...
,
DYNLL1
Dynein light chain 1, cytoplasmic is a protein that in humans is encoded by the ''DYNLL1'' gene.
Function
Cytoplasmic dyneins are large enzyme complexes with a molecular mass of about 1,200 kD. They contain two force-producing heads formed pri ...
,[
* ]IKK2
IKK-β also known as inhibitor of nuclear factor kappa-B kinase subunit beta is a protein that in humans is encoded by the ''IKBKB'' (inhibitor of kappa light polypeptide gene enhancer in B-cells, kinase beta) gene.
Function
IKK-β is an enzy ...
,NFKB1
Nuclear factor NF-kappa-B p105 subunit is a protein that in humans is encoded by the ''NFKB1'' gene.
This gene encodes a 105 kD protein which can undergo cotranslational processing by the 26S proteasome to produce a 50 kD protein. The 105 kD pro ...
,[
* ]P53
p53, also known as tumor protein p53, cellular tumor antigen p53 (UniProt name), or transformation-related protein 53 (TRP53) is a regulatory transcription factor protein that is often mutated in human cancers. The p53 proteins (originally thou ...
,RELA
Transcription factor p65 also known as nuclear factor NF-kappa-B p65 subunit is a protein that in humans is encoded by the ''RELA'' gene.
RELA, also known as p65, is a REL-associated protein involved in NF-κB heterodimer formation, nuclear tra ...
,RPS6KA1
Ribosomal protein S6 kinase alpha-1 is an enzyme that in humans is encoded by the ''RPS6KA1'' gene.
Function
This gene encodes a member of the RSK (ribosomal S6 kinase) family of serine/threonine kinases. This kinase contains 2 nonidentical ...
,SUMO4
Small ubiquitin-related modifier 4 is a protein that in humans is encoded by the ''SUMO4'' gene.
Function
This gene is a member of the SUMO gene family. This family of genes encode small ubiquitin-related modifiers that are attached to protein ...
,Valosin-containing protein
Valosin-containing protein (VCP) or transitional endoplasmic reticulum ATPase (TER ATPase) also known as p97 in mammals and CDC48 in '' S. cerevisiae,'' is an enzyme that in humans is encoded by the ''VCP'' gene. The TER ATPase is an ATPase enz ...
.
References
Further reading
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External links
OMIM entries on Ectodermal Dysplasia, Anhidrotic, with T-cell Immunodeficiency
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{{DEFAULTSORT:Ikappabetaalpha
Transcription factors