SPACI score report for 1zgk in ASTRAL 2.07:

PDB Entry: 1zgk
SPACI score: 0.79
AEROSPACI score: 0.79

Experiment type: XRAY
Resolution: 1.35
R-factor: 0.112
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: 1.955
WCK2 WHAT_CHECK Ramachandran: 1.244
WCK3 WHAT_CHECK Chi angles: 1.563
WCK4 WHAT_CHECK Backbone: 1.412

Note: Here are links to pages about PROCHECK and WHAT_CHECK.

Here is the full WHAT_CHECK report on this protein (linked from the WHAT_CHECK site).