SPACI score report for 1pk1 in ASTRAL 2.01:

PDB Entry: 1pk1
SPACI score: 0.47
AEROSPACI score: 0.47 (mutant; see below)

Experiment type: XRAY
Resolution: 1.8
R-factor: 0.233
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -1.192
WCK2 WHAT_CHECK Ramachandran: -0.247
WCK3 WHAT_CHECK Chi angles: -0.429
WCK4 WHAT_CHECK Backbone: 0.96

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 1PK1 B:17-79; automatically matched to 1PK1 A:12-79; automated match to d1kw4a_"

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).