4dq5 | pdb_00004dq5

Structural Investigation of Bacteriophage Phi6 Lysin (WT)

spinqualitylabelsall models 4dq5, resolution 1.40Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4dq5 is a 2 chain structure with sequence from Bpph6. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: AES Related: 4dqj, 4dq7 Gene: P5, p5a (BPPH6) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed The modulation of fitness by single mutational substitutions during environmental change is the most fundamental consequence of natural selection. The antagonistic tradeoffs of pleiotropic mutations that can be selected under changing environments therefore lie at the foundation of evolutionary biology. However, the molecular basis of fitness tradeoffs is rarely determined in terms of how these pleiotropic mutations affect protein structure. Here we use an interdisciplinary approach to study how antagonistic pleiotropy and protein function dictate a fitness tradeoff. We challenged populations of an RNA virus, bacteriophage Phi6, to evolve in a novel temperature environment where heat shock imposed extreme virus mortality. A single amino acid substitution in the viral lysin protein P5 (V207F) favored improved stability, and hence survival of challenged viruses, despite a concomitant tradeoff that decreased viral reproduction. This mutation increased the thermostability of P5. Crystal structures of wild-type, mutant, and ligand-bound P5 reveal the molecular basis of this thermostabilization--the Phe207 side chain fills a hydrophobic cavity that is unoccupied in the wild-type--and identify P5 as a lytic transglycosylase. The mutation did not reduce the enzymatic activity of P5, suggesting that the reproduction tradeoff stems from other factors such as inefficient capsid assembly or disassembly. Our study demonstrates how combining experimental evolution, biochemistry, and structural biology can identify the mechanisms that drive the antagonistic pleiotropic phenotypes of an individual point mutation in the classic evolutionary tug-of-war between survival and reproduction. Selective pressure causes an RNA virus to trade reproductive fitness for increased structural and thermal stability of a viral enzyme.,Dessau M, Goldhill D, McBride R, Turner PE, Modis Y PLoS Genet. 2012;8(11):e1003102. doi: 10.1371/journal.pgen.1003102. Epub 2012 Nov, 29. PMID:23209446 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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