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P22 coat protein structures reveal a novel mechanism for capsid maturation: stability without auxiliary proteins or chemical crosslinks.
Viral capsid assembly and stability in tailed, dsDNA phage and Herpesviridae are achieved by various means including chemical crosslinks (unique to HK97), or auxiliary proteins (lambda, T4, phi29,… Expand
SecA folds via a dimeric intermediate.
Though many proteins in the cell are large and multimeric, their folding has not been extensively studied. We have chosen SecA as a folding model because it is a large, homodimeric protein (monomer… Expand
Nature's favorite building block: Deciphering folding and capsid assembly of proteins with the HK97-fold.
For many (if not all) bacterial and archaeal tailed viruses and eukaryotic Herpesvirdae the HK97-fold serves as the major architectural element in icosahedral capsid formation while still enabling… Expand
ATPase activity of Mycobacterium tuberculosis SecA1 and SecA2 proteins and its importance for SecA2 function in macrophages.
The Sec-dependent translocation pathway that involves the essential SecA protein and the membrane-bound SecYEG translocon is used to export many proteins across the cytoplasmic membrane. Recently,… Expand
Multiple functional roles of the accessory I-domain of bacteriophage P22 coat protein revealed by NMR structure and CryoEM modeling.
Some capsid proteins built on the ubiquitous HK97-fold have accessory domains imparting specific functions. Bacteriophage P22 coat protein has a unique insertion domain (I-domain). Two prior I-domain… Expand
Phage P22 procapsids equilibrate with free coat protein subunits.
- K. N. Parent, Margaret M. Suhanovsky, C. Teschke
- Chemistry, Medicine
- Journal of molecular biology
- 12 January 2007
Assembly of bacteriophage P22 procapsids has long served as a model for assembly of spherical viruses. Historically, assembly of viruses has been viewed as a non-equilibrium process. Recently… Expand
Aggregation and assembly of phage P22 temperature-sensitive coat protein mutants in vitro mimic the in vivo phenotype.
- C. Teschke
- Biology, Medicine
- 17 February 1999
Aggregation is a common side reaction in the folding of proteins which is likely due to inappropriate interactions of folding intermediates. In the in vivo folding of phage P22 coat protein, amino… Expand
Single Amino Acid Substitutions Globally Suppress the Folding Defects of Temperature-sensitive Folding Mutants of Phage P22 Coat Protein*
The amino acid sequence of a polypeptide defines both the folding pathway and the final three-dimensional structure of a protein. Eighteen amino acid substitutions have been identified in… Expand
'Let the phage do the work': using the phage P22 coat protein structures as a framework to understand its folding and assembly mutants.
The amino acid sequence of viral capsid proteins contains information about their folding, structure and self-assembly processes. While some viruses assemble from small preformed oligomers of coat… Expand
Cryo-reconstructions of P22 polyheads suggest that phage assembly is nucleated by trimeric interactions among coat proteins.
- K. N. Parent, R. Sinkovits, Margaret M. Suhanovsky, C. Teschke, E. Egelman, T. Baker
- Biology, Medicine
- Physical biology
- 9 December 2010
Bacteriophage P22 forms an isometric capsid during normal assembly, yet when the coat protein (CP) is altered at a single site, helical structures (polyheads) also form. The structures of three… Expand