SPACI score report for 1z3u in ASTRAL 2.07:

PDB Entry: 1z3u
SPACI score: 0.33
AEROSPACI score: 0.33

Experiment type: XRAY
Resolution: 2.25
R-factor: 0.246
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -2.037
WCK2 WHAT_CHECK Ramachandran: -3.397
WCK3 WHAT_CHECK Chi angles: -1.394
WCK4 WHAT_CHECK Backbone: -3.024

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).