2AC3

Structure of human Mnk2 Kinase Domain

Summary for 2AC3

• Entry DOI: 10.2210/pdb2ac3/pdb
• Related: 2AC5
• Descriptor: MAP kinase-interacting serine/threonine kinase 2, ZINC ION (3 entities in total)
• Functional Keywords: dfd motif, transferase
• Biological source: Homo sapiens (human)
• Total number of polymer chains: 1
• Total formula weight: 35727.90

Authors

Jauch, R.,Wahl, M.C.,Netter, C.,Jakel, S.,Schreiter, K.,Aicher, B.,Jackle, H. (deposition date: 2005-07-18, release date: 2005-10-04, Last modification date: 2024-03-13)

Primary citation

Jauch, R.,Jakel, S.,Netter, C.,Schreiter, K.,Aicher, B.,Jackle, H.,Wahl, M.C.
Crystal structures of the Mnk2 kinase domain reveal an inhibitory conformation and a zinc binding site.
Structure, 13:1559-1568, 2005

PubMed Abstract: Human mitogen-activated protein kinases (MAPK)-interacting kinases 1 and 2 (Mnk1 and Mnk2) target the translational machinery by phosphorylation of the eukaryotic initiation factor 4E (eIF4E). Here, we present the 2.1 A crystal structure of a nonphosphorylated Mnk2 fragment that encompasses the kinase domain. The results show Mnk-specific features such as a zinc binding motif and an atypical open conformation of the activation segment. In addition, the ATP binding pocket contains an Asp-Phe-Asp (DFD) in place of the canonical magnesium binding Asp-Phe-Gly (DFG) motif. The phenylalanine of this motif sticks into the ATP binding pocket and blocks ATP binding as observed with inhibitor bound and, thus, inactive p38 kinase. Replacement of the DFD by the canonical DFG motif affects the conformation of Mnk2, but not ATP binding and kinase activity. The results suggest that the ATP binding pocket and the activation segment of Mnk2 require conformational switches to provide kinase activity.

PubMed: 16216586
DOI: 10.1016/j.str.2005.07.013

Experimental method

X-RAY DIFFRACTION (2.1 Å)