SPACI score report for 1zs4 in ASTRAL 2.08:

PDB Entry: 1zs4
SPACI score: 0.54
AEROSPACI score: 0.54

Experiment type: XRAY
Resolution: 1.7
R-factor: 0.209
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 1
WCK1 WHAT_CHECK Packing: -0.716
WCK2 WHAT_CHECK Ramachandran: 0.88
WCK3 WHAT_CHECK Chi angles: 0.134
WCK4 WHAT_CHECK Backbone: 0.285

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).