1ohg is a 7 chain structure with sequence from Bphk7. This structure supersedes the now removed PDB entry 1fh6. The September 2007 RCSB PDB Molecule of the Month feature on Citrate Synthase by David S. Goodsell is 10.2210/rcsb_pdb/mom_2007_9. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Checkto colour the structure by Evolutionary Conservation, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
The HK97 bacteriophage capsid is a unique example of macromolecular catenanes: interlocked rings of covalently attached protein subunits. The chain mail organization of the subunits stabilizes a particle in which the maximum thickness of the protein shell is 18A and the maximum diameter is 550A. The electron density has the appearance of a balloon illustrating the extraordinary strength conferred by the unique subunit organization. The refined structure shows novel qualities of the HK97 shell protein, gp5 that, together with the protease gp4, guides the assembly and maturation of the virion. Although gp5 forms hexamers and pentamers and the subunits exist in different structural environments, the tertiary structures of the seven protein molecules in the viral asymmetric unit are closely similar. The interactions of the subunits in the shell are exceptionally complex with each subunit interacting with nine other subunits. The interactions of the N-terminus released after gp5 cleavage appear important for organization of the loops that become crosslinked to the core of a neighboring subunit at the maturation. A comparison with a model of the Prohead II structure revealed that the surfaces of non-covalent contact between the monomers that build up hexamers/pentamers are completely redefined during maturation.
The refined structure of a protein catenane: the HK97 bacteriophage capsid at 3.44 A resolution.,Helgstrand C, Wikoff WR, Duda RL, Hendrix RW, Johnson JE, Liljas L J Mol Biol. 2003 Dec 12;334(5):885-99. PMID:14643655[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
↑ Helgstrand C, Wikoff WR, Duda RL, Hendrix RW, Johnson JE, Liljas L. The refined structure of a protein catenane: the HK97 bacteriophage capsid at 3.44 A resolution. J Mol Biol. 2003 Dec 12;334(5):885-99. PMID:14643655
