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GENE AND PROTEIN SUMMARY

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Gene name

CFB

Description

complement factor B

Protein class

Enzymes, Mapped to UniProt SWISS-PROT, Peptidases, Plasma proteins, Potential transmembrane proteins, Potentially secreted proteins

Protein evidence

High

Entrez gene summary

This gene encodes complement factor B, a component of the alternative pathway of complement activation. Factor B circulates in the blood as a single chain polypeptide. Upon activation of the alternative pathway, it is cleaved by complement factor D yielding the noncatalytic chain Ba and the catalytic subunit Bb. The active subunit Bb is a serine protease which associates with C3b to form the alternative pathway C3 convertase. Bb is involved in the proliferation of preactivated B lymphocytes, while Ba inhibits their proliferation. This gene localizes to the major histocompatibility complex (MHC) class III region on chromosome 6. This cluster includes several genes involved in regulation of the immune reaction. Polymorphisms in this gene are associated with a reduced risk of age-related macular degeneration. The polyadenylation site of this gene is 421 bp from the 5' end of the gene for complement component 2. [provided by RefSeq, Jul 2008]

External links

Ensembl, UniProt, Entrez gene, neXtProt, Antibodypedia

No of splice variants

6 in total
0 with predicted TM region
3 with predicted signal peptide

SUBCELLULAR LOCATION SUMMARY

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Main location(s)

Cytoplasm

Additional location(s)

Nucleus 

Staining summary

Staining of cytoplasm in all three cell lines with additional staining of nucleus in A-431.

Reliability (Single)

Antibodies in assay

HPA001817
 

NORMAL TISSUE & ORGAN SUMMARY

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Expression summary

Expression mainly in extracellular deposits, plasma. Caution: Based on antibodies targeting proteins from multiple genes.

Tissue specificity

Expressed in 25 out of 81 cell types

Reliability (APE)

Medium

Antibodies in assay

HPA001817, HPA001832, CAB016381
 

Organ

No of cell types

Protein expression

CNS (brain) 11
Hematopoietic (blood) 8
Liver and pancreas 5
Digestive (GI-tract) 13
Respiratory (lung) 4
Cardiovascular 1
Female tissues 13
Placenta 1
Male tissues 5
Urinary tract (kidney) 3
Skin and soft tissues 14
Endocrine tissues 3

Level of annotated protein expression





High
Medium
Low
None

CANCER TISSUE SUMMARY

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Staining summary

Antibody staining in 73% of the cancers

Antibodies in assay

HPA001817, HPA001832, CAB016381
 

Tissue

Cancer staining

Protein
expression of
normal tissue

Breast cancer
 
Carcinoid
 
Cervical cancer
 
 
Colorectal cancer
 
 
Endometrial cancer
 
 
Glioma
 
Head and neck cancer
 
 
Liver cancer
 
 
Lung cancer
 
 
Lymphoma
 
 
 

Tissue

Cancer staining

Protein
expression of
normal tissue

Melanoma
 
Ovarian cancer
 
Pancreatic cancer
 
Prostate cancer
 
Renal cancer
 
Skin cancer
 
Stomach cancer
 
 
Testis cancer
 
Thyroid cancer
 
Urothelial cancer
 

Level of antibody staining





Strong
Moderate
Weak
Negative

CELL LINE SUMMARY

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RNA evidence

High
 

Cell line

Cell origin

RNA abundance

IH staining

IF intensity

HPA001817

HPA001832

CAB016381

HPA001817

A-431 Skin Low
Weak
A-549 Lung Medium
CACO-2 Colon Medium
HEK 293 Embryonal kidney Low
HeLa Cervix Low
Hep-G2 Liver High
MCF-7 Pleural effusion Low
PC-3 Bone marrow Low
RT-4 Urinary bladder Low
U-2 OS Bone Low
Weak
U-251 MG Brain Low
Strong

ANTIBODY SUMMARY

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Antibody

Clonality

Validation

Also mapped to

HPA001817 pAb
XXbac-BPG116M5.17 (100%)
HPA001832 pAb
XXbac-BPG116M5.17 (100%)
CAB016381 mAb