TCDB is operated by the Saier Lab Bioinformatics Group
TCIDNameDomainKingdom/PhylumProtein(s)
1.G.2.1.1









The Paramyxovirus (Class I) fusion (F) protein (545 aas)
Viruses
Mononegavirales
Protein F of Paramyxovirus (Q5S8E4)
1.G.2.1.2









Fusion glycoprotein FO (Class I) (565 aas) (31% identical throughout its length with 1.H.2.1.1) (Lamb and Jardetzky 2007).  Interacts with protein G and protein TM in J paramyxovirus to promote fusion (Li et al. 2015).

Viruses
Orthornavirae
1.G.2.1.3









The respiratory syncytial virus (RSV) fusion (F) glycoprotein.  The crystal strcuture is available (McLellan et al. 2013).  The protein has at least 3 conformational states: pre-fusion native state, pre-hairpin intermediate state, and post-fusion hairpin state. During viral and plasma cell membrane fusion, the heptad repeat (HR) regions assume a trimer-of-hairpins structure, positioning the fusion peptide in close proximity to the C-terminal region of the ectodomain. The formation of this structure appears to drive apposition and subsequent fusion of viral and plasma cell membranes which leads to delivery of the nucleocapsid into the cytoplasm. Fusion is pH independent and occurs directly at the outer cell membrane. The trimer of F1-F2 (protein F) interacts with glycoprotein G at the virion surface. Upon binding of G to heparan sulfate, the hydrophobic fusion peptide is unmasked and interacts with the cellular membrane, inducing the fusion between host cell and virion membranes. RSV fusion protein is able to interact directly with heparan sulfate and therefore actively participates in virus attachment.

Viruses
Mononegavirales
F-glycoprotein of respiatory syncytial virus
1.G.2.1.4









The fusion glycoprotein F0 of 94 aas

Viruses
Mononegavirales
F0 of Newcastle Disease Virus
1.G.2.1.5









Fusion glycoprotein F0 of 550 aas

Viruses
Mononegavirales
Fusion glycoprotein of Measles virus
1.G.2.1.6









Fusion glycoprotein of 529 aas (Apellániz et al. 2014). Loosely associated fusion peptide and TMS helices generate significant negative Gaussian curvature to membranes that possess spontaneous positive curvature, consistent with fusion peptide-TMS assembly facilitating the transition of the membrane from hemifusion intermediates to the fusion pore (Yao et al. 2016).

Viruses
Mononegavirales
Fusion protein of influenza virus 5 (PIV5)
1.G.2.1.7









Fusion glycoprotein F0 of 546 aas and 2 TMSs (N- and C-terminal) (Apellániz et al. 2014). The unique endocytic trafficking pathway of Hendra virus F protein is required for proper viral assembly and particle release (Cifuentes-Muñoz et al. 2017).

Viruses
Mononegavirales
F0 of Hendra virus
1.G.2.1.8









Fusion glycoprotein, F, of 111 aas and 1 C-terminal TMS as well as two small peaks of moderate hydrophobicity in the N-terminal and central regions of the protein. The trimeric fusion, F, glycoproteins of morbilliviruses are activated by furin cleavage of the precursor F0 into the F1 and F2 subunits, and an additional membrane-proximal cleavage occurs and modulates F protein function (von Messling et al. 2004).

Viruses
Orthornavirae
Fusion GP of Canine morbillivirus
1.G.2.2.1









Baseplate J/gp47 family protein of 374 aa

Bacteria
Proteobacteria
Gp47 family protein of Providencia stuartii