1td0

Viral capsid protein SHP at pH 5.5

spinqualitylabelsall models 1td0, resolution 1.95Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1td0 is a 4 chain structure with sequence from Enterobacteria phage p21. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [VSHP_BPP21] Stabilizes the head shell following the rearrangement of the gp7 subunits of the head shell lattice that accompanies expansion of the head. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed SHP, the capsid-stabilizing protein of lambdoid phage 21, is highly resistant against denaturant-induced unfolding. We demonstrate that this high functional stability of SHP is due to a high kinetic stability with a half-life for unfolding of 25 days at zero denaturant, while the thermodynamic stability is not unusually high. Unfolding experiments demonstrated that the trimeric state (also observed in crystals and present on the phage capsid) of SHP is kinetically stable in solution, while the monomer intermediate unfolds very rapidly. We also determined the crystal structure of trimeric SHP at 1.5A resolution, which was compared to that of its functional homolog gpD. This explains how a tight network of H-bonds rigidifies crucial interpenetrating residues, leading to the observed extremely slow trimer dissociation or denaturation. Taken as a whole, our results provide molecular-level insights into natural strategies to achieve kinetic stability by taking advantage of protein oligomerization. Kinetic stability may be especially needed in phage capsids to allow survival in harsh environments. Kinetic stability and crystal structure of the viral capsid protein SHP.,Forrer P, Chang C, Ott D, Wlodawer A, Pluckthun A J Mol Biol. 2004 Nov 12;344(1):179-93. PMID:15504410 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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