SPACI score report for 1z4p in ASTRAL 2.08:

PDB Entry: 1z4p
SPACI score: 0.45
AEROSPACI score: 0.45

Experiment type: XRAY
Resolution: 2
R-factor: 0.19
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -2.559
WCK2 WHAT_CHECK Ramachandran: -0.312
WCK3 WHAT_CHECK Chi angles: -0.436
WCK4 WHAT_CHECK Backbone: 0.417

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).