Many structure models of HK97 proheads and capsids have been deposited to the PDB.
one of the best ways to rapidly view and analyze these capsid structures is to use the ViperDB, or VIrus Particle ExplorR.

HK97 PDB entries
1OHG Bacteriophage HK97 mature empty capsid (orig. HEAD II refined) 3.45 Angstroms
2FT1 Bacteriophage HK97 HEAD II (new) (not fully expanded?) 3.90 Angstroms
2FS3 Bacteriophage HK97 K169Y HEAD I (mutant that can't crosslink) 4.20 Angstroms
2FSY Bacteriophage HK97 pepsin-treated EXPANSION INTERMEDIATE IV 3.80 Angstroms
2FRP Bacteriophage HK97 EXPANSION INTERMEDIATE IV 7.50 Angstroms
3E8K Crystal structure of HK97 Prohead II (truncated mcp used) 3.65 Angstroms
3QPR HK97 Prohead I* encapsidating inactive virally encoded protease 5.20 Angstroms
2FTE BACTERIOPHAGE HK97 EXPANSION INTERMEDIATE IV PSEUDO-ATOMIC CRYO-EM Model
1IF0 BACTERIOPHAGE HK97 PROCAPSID (PROHEAD II) PSEUDO-ATOMIC CRYO-EM Model

There are also a number of structurally related entries

1YUE BACTERIOPHAGE T4 capsid vertex protein gp24 2.90 Angstroms
2E0Z Virus-like particle from Pyrococcus furiosus 3.60 Angstroms
3DKT CRYSTAL STRUCTURE OF THERMOTOGA MARITIMA ENCAPSULIN 3.10 Angstroms
3BQW Crystal structure of the putative capsid protein of prophage (E.coli CFT073) 2.20 Angstroms
1YXN BACTERIOPHAGE Phi29 Fiberless Isometric Variant PSEUDO-ATOMIC CRYO-EM Model
3J40[capsid of] phage Epsilon15 ... from Cryo-EM and Modeling PSEUDO-ATOMIC CRYO-EM Model
2XYYde novo model of Bacteriophage P22 procapsid coat protein 3.8 Angstroms (c-alpha)
2XYZde novo model of Bacteriophage P22 virion coat protein4.0 Angstroms (c-alpha)

*Note: the wild-type protein was used to make the 3QPR crystals, but the 3QPR model is based on the trucated protein used for 3E8K (13 E-loop tip residues NADVVAEKALKPE replaced by APGD)

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