SPACI score report for 1tk1 in ASTRAL 2.08:

PDB Entry: 1tk1
SPACI score: 0.43
AEROSPACI score: -1.57 (disorder; see below)

Experiment type: XRAY
Resolution: 1.9
R-factor: 0.217
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -0.757
WCK2 WHAT_CHECK Ramachandran: -1.248
WCK3 WHAT_CHECK Chi angles: -0.759
WCK4 WHAT_CHECK Backbone: -1.089

The AEROSPACI score for this entry is lower than the SPACI score because human-curated comments on the entry in SCOPe contain the phrase disorder. The full comment is: "C-terminal part is disordered in the crystal; alternative dimerisation mode (cf. 1TXN)"

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).