SPACI score report for 1gk8 in ASTRAL 1.59:

PDB Entry: 1gk8
SPACI score: 0.72
AEROSPACI score: 0.72

Experiment type: XRAY
Resolution: 1.4
R-factor: 0.149
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: 1.248
WCK2 WHAT_CHECK Ramachandran: 0.198
WCK3 WHAT_CHECK Chi angles: 0.788
WCK4 WHAT_CHECK Backbone: -0.009

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).