Details

Autor(en) / Beteiligte

• Narasimhan, Jana
• Wang, Ming
• Fu, Zhuji
• Klein, Jennifer M.
• Haas, Arthur L.
• Kim, Jung-Ja P.

Titel

Crystal Structure of the Interferon-induced Ubiquitin-like Protein ISG15

Ist Teil von

• The Journal of biological chemistry, 2005-07, Vol.280 (29), p.27356-27365

Ort / Verlag

United States: Elsevier Inc

Erscheinungsjahr

2005

Link zum Volltext

Quelle

MEDLINE

Beschreibungen/Notizen

• The biological effects of the ISG15 protein arise in part from its conjugation to cellular targets as a primary response to interferon-α/β induction and other markers of viral or parasitic infection. Recombinant full-length ISG15 has been produced for the first time in high yield by mutating Cys78 to stabilize the protein and by cloning in a C-terminal arginine cap to protect the C terminus against proteolytic inactivation. The cap is subsequently removed with carboxypeptidase B to yield mature biologically active ISG15 capable of stoichiometric ATP-dependent thiolester formation with its human UbE1L activating enzyme. The three-dimensional structure of recombinant ISG15C78S was determined at 2.4-Å resolution. The ISG15 structure comprises two β-grasp folds having main chain root mean square deviation (r.m.s.d.) values from ubiquitin of 1.7 Å (N-terminal) and 1.0 Å (C-terminal). The β-grasp domains pack across two conserved 310 helices to bury 627 Å2 that accounts for 7% of the total solvent-accessible surface area. The distribution of ISG15 surface charge forms a ridge of negative charge extending nearly the full-length of the molecule. Additionally, the N-terminal domain contains an apolar region comprising almost half its solvent accessible surface. The C-terminal domain of ISG15 was superimposed on the structure of Nedd8 (r.m.s.d. = 0.84 Å) bound to its AppBp1-Uba3 activating enzyme to model ISG15 binding to UbE1L. The docking model predicts several key side-chain interactions that presumably define the specificity between the ubiquitin and ISG15 ligation pathways to maintain functional integrity of their signaling.