SPACI score report for 1z9k in ASTRAL 2.07:

PDB Entry: 1z9k
SPACI score: -0.1
AEROSPACI score: -0.1

Experiment type: XRAY
Resolution: 4.6
R-factor: 0.33
PCK1 PROCHECK Ramachandran: 4
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 3
WCK1 WHAT_CHECK Packing: -3.92
WCK2 WHAT_CHECK Ramachandran: -8.526
WCK3 WHAT_CHECK Chi angles: -4.479
WCK4 WHAT_CHECK Backbone: -4.415

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).