SPACI score report for 1jkb in ASTRAL 1.59:

PDB Entry: 1jkb
SPACI score: 0.57
AEROSPACI score: 0.57

Experiment type: XRAY
Resolution: 1.66
R-factor: 0.178
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -1.245
WCK2 WHAT_CHECK Ramachandran: 0.034
WCK3 WHAT_CHECK Chi angles: 1.059
WCK4 WHAT_CHECK Backbone: -0.825

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).