Abstract
The transforming growth factor-β (TGFβ) superfamily of proteins and their receptors are crucial developmental factors for all metazoan organisms. Cystine-knot (CK) motif is a spatial feature of the TGFβ superfamily of proteins whereas the extra-cellular domains (ectodomains) of their respective receptors form three-fingered protein domain (TFPD), both stabilized by tight cystine networks. Analyses of multiple sequence alignments of these two domains encoded in various genomes revealed that the cystines forming the CK and TFPD folds are conserved, whereas the remaining polypeptide patches are diversified. Orthologues of the human TGFβs and their respective receptors expressed in diverse vertebrates retain high sequence conservation. Examination of 3D structures of various TGFβ factors bound to their receptors have revealed that the CK and TFPD domains display several similar spatial traits suggesting that these two different protein folds might have been acquired from a common ancestor.
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Abbreviations
- TGFβ:
-
Transforming growth factor
- GDF:
-
Growth/differentiation factor
- GDNF:
-
Glial cell line-derived neurotrophic factor
- AMH:
-
Anti-Mullerian hormone
- PDGF:
-
Platelet-derived growth factor
- LEFTY_A:
-
Endometrial bleeding associated factor
- LEFTY_B:
-
Left–right determination factor B
- PLGF:
-
Placental growth factor
- CTGF:
-
Connective tissue growth factor
- VEGF:
-
Vascular endothelial growth factor
- CG:
-
Chorionic gonadotropin hormone
- DAN:
-
Differential screening-selected gene aberrative in neuroblastoma
- FSHβ:
-
Follicle-stimulating hormone
- ActRIB:
-
Activin receptor type IB
- ALK:
-
Activin receptor-like kinase
- BMP:
-
Bone morphogenetic protein
- BMPR:
-
BMP receptor
- ASIP:
-
Agouti signaling protein
- GPCR:
-
G protein-coupled receptor
- TFPD:
-
Three-fingered protein domain
- CK:
-
Cystine knot
- ICK:
-
Inhibitor cystine knot
- ECD:
-
Ectodomain
- MSA:
-
Multiple sequence alignment
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We are indebted to SIMOPRO/iBiTecS/DSV/CEA for financial support.
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Galat, A. Common structural traits for cystine knot domain of the TGFβ superfamily of proteins and three-fingered ectodomain of their cellular receptors. Cell. Mol. Life Sci. 68, 3437–3451 (2011). https://doi.org/10.1007/s00018-011-0643-4
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DOI: https://doi.org/10.1007/s00018-011-0643-4