SPACI score report for 1ykw in ASTRAL 2.07:

PDB Entry: 1ykw
SPACI score: 0.42
AEROSPACI score: 0.42 (mutant; see below)

Experiment type: XRAY
Resolution: 2
R-factor: 0.203
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -1.107
WCK2 WHAT_CHECK Ramachandran: -1.34
WCK3 WHAT_CHECK Chi angles: -2.23
WCK4 WHAT_CHECK Backbone: 2.538

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 1YKW A:146-428; automatically matched to 1YKW A:4-145; automated match to d1ykwa1; automated match to d1ykwa2"

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).