Primary Citation PubMed: 10545330
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Macromolecular complexes in crystals and solutions.
(2011) Acta Crystallogr D Biol Crystallogr 67
PubMed: 21460456 | PubMedCentral: PMC3069753 | DOI: 10.1107/S0907444911007232
According to experimental findings (Rossmann et al. , 2004 ▶ ), one biological function of 1qex homotrimers is to provide attachment of long-tail fibres to the T4 virus baseplate.
( c ) Alternative homotrimer 1s2e obtained by different main-chain tracing in the same electron-density maps as 1qex ; 1s2e trimers are correctly identified by PISA as not forming stable hexamers.
The most plausible answer to these questions was offered by one of the authors of the 1qex structure (Dr Sergey Strelkov, University of Leuven, Belgium; private communication at the ECM-23 meeting in 2006).
It appears that electron-density maps of 1qex allow alternative tracing of the protein backbones in which the short tails of each 1qex trimer are replaced by the corresponding parts from its hexamer-forming partner.
Where chemistry ‘makes no sense’ One of the most striking examples where the Δ G 0 diss -based procedure for automatic identification of macromolecular complexes grossly fails is given by PDB entry 1qex (bacteriophage T4 gene product 9; Kostyuchenko et al. , 1999 ▶ ).
Figure 4 ( a ) Homohexamer predicted by PISA for PDB entry 1qex .
The homotrimer represents the dissociation subunit of the 1qex hexamer and is also estimated by PISA to be very stable, with Δ G 0 diss ≃ 90 kcal mol −1 .
( b ) 1qex homotrimer identified as the biological unit in an experimental study by Rossmann et al. (2004 ▶ ); the hexamer is predicted to dissociate into two trimers.
Publication Year: 2011
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