SPACI score report for 1z9c in ASTRAL 2.07:

PDB Entry: 1z9c
SPACI score: 0.27
AEROSPACI score: 0.27 (mutant; see below)

Experiment type: XRAY
Resolution: 2.64
R-factor: 0.216
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -2.44
WCK2 WHAT_CHECK Ramachandran: -4.306
WCK3 WHAT_CHECK Chi angles: -2.94
WCK4 WHAT_CHECK Backbone: 0.14

The AEROSPACI score for this entry is lower than the SPACI score because human-curated comments on the entry in SCOPe contain the phrase mutant. The full comment is: "mutant; automatically matched to 1Z91 A:8-144; automated match to d1z91a1"

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).