TGFB

Transforming growth factor-beta (TGF-beta) family
TGFB
SMART accession number:SM00204
Description: Family members are active as disulphide-linked homo- or heterodimers. TGFB is a multifunctional peptide that controls proliferation, differentiation, and other functions in many cell types.
Interpro abstract (IPR001839):

Transforming growth factor-beta (TGF-beta) is a multifunctional peptide that controls proliferation, differentiation and other functions in many cell types. TGF-beta-1 is a peptide of 112 amino acid residues derived by proteolytic cleavage from the C-terminal of a precursor protein.

A number of proteins are known to be related to TGF-beta-1 (PUBMED:1575734), (PUBMED:8199356). Proteins from the TGF-beta family are only active as homo- or heterodimer; the two chains being linked by a single disulphide bond. From X-ray studies of TGF-beta-2 (PUBMED:1631557), it is known that all the other cysteines are involved in intrachain disulphide bonds. As shown in the following schematic representation, there are four disulphide bonds in the TGF-beta's and in inhibin beta chains, while the other members of this family lack the first bond.


interchain
|
+------------------------------------------|+
| ||
xxxxcxxxxxCcxxxxxxxxxxxxxxxxxxCxxCxxxxxxxxxxxxxxxxxxxCCxxxxxxxxxxxxxxxxxxxCxCx
| | | | | |
+------+ +--|----------------------------------------+ |
+------------------------------------------+

'C': conserved cysteine involved in a disulphide bond.
GO function:growth factor activity (GO:0008083)
Family alignment:
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There are 1486 TGFB domains in 1486 proteins in SMART's nrdb database.

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