SPACI score report for 1t89 in ASTRAL 2.06:

PDB Entry: 1t89
SPACI score: 0.1
AEROSPACI score: 0.1

Experiment type: XRAY
Resolution: 3.5
R-factor: 0.247
PCK1 PROCHECK Ramachandran: 2
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 3
WCK1 WHAT_CHECK Packing: -2.873
WCK2 WHAT_CHECK Ramachandran: -6.038
WCK3 WHAT_CHECK Chi angles: -4.695
WCK4 WHAT_CHECK Backbone: 0.215

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).