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PMID:20826161

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Citation

Pell, LG, Gasmi-Seabrook, GM, Morais, M, Neudecker, P, Kanelis, V, Bona, D, Donaldson, LW, Edwards, AM, Howell, PL, Davidson, AR and Maxwell, KL (2010) The solution structure of the C-terminal Ig-like domain of the bacteriophage λ tail tube protein. J. Mol. Biol. 403:468-79

Abstract

Immunoglobulin (Ig)-like domains are found frequently on the surface of tailed double-stranded DNA bacteriophages, yet their functional role remains obscure. Here, we have investigated the structure and function of the C-terminal Ig-like domain of gpV (gpV(C)), the tail tube protein of phage λ. This domain has been predicted through sequence similarity to be a member of the bacterial Ig-like domain 2 (Big_2) family, which is composed of more than 1300 phage and bacterial sequences. Using trypsin proteolysis, we have delineated the boundaries of gpV(C) and have shown that its removal reduces the biological activity of gpV by 100-fold; thus providing a definitive demonstration of a functional role for this domain. Determination of the solution structure of gpV(C) by NMR spectroscopy showed that it adopts a canonical Ig-like fold of the I-set class. This represents the first structure of a phage-encoded Ig-like domain and only the second structure of a Big_2 domain. Structural and sequence comparisons indicate that the gpV(C) structure is more representative of both the phage-encoded Big_2 domains and Big_2 domains in general than the other available Big_2 structure. Bioinformatics analyses have identified two conserved clusters of residues on the surface of gpV(C) that may be important in mediating the function of this domain.

Links

PubMed Online version:10.1016/j.jmb.2010.08.044

Keywords

Bacteriophage lambda/chemistry; Bacteriophage lambda/metabolism; Crystallography, X-Ray; Immunoglobulins/chemistry; Immunoglobulins/metabolism; Kinetics; Magnetic Resonance Spectroscopy; Models, Molecular; Protein Conformation; Thermodynamics; Viral Tail Proteins/chemistry; Viral Tail Proteins/metabolism

Significance

Annotations

Gene product Qualifier GO Term Evidence Code with/from Aspect Extension Notes Status

9CAUD:A0A0N9ST32

GO:0039624: viral outer capsid

ECO:0000314:

C

The C-terminal Ig-like domain of gpV (gpVc) was fitted into cryo-EM density of the ϕ29 capsid in three structures. The domain was shown to fold into the superposition of gpVc and the intimin Big_2 domain structures. Figure 7 shows a density map of the ϕ29 capsid cryo-EM model. From the cryo-EM image, in Figure 7a, we can see only the superposition of gpVc. And in contrast, Figure 7b shows the Big_2 domain structures and how they fit into the gp8 density, further proving the presence of a capsid protein. From the combination of these two components, we can notice in Figure 7c, the lg-like domain of ϕ29 gp8.

complete
CACAO 12923

Notes

See also

References

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