| Structural highlights
Function
M3K3_HUMAN Component of a protein kinase signal transduction cascade. Mediates activation of the NF-kappa-B, AP1 and DDIT3 transcriptional regulators.[1] [2] [3] [4]
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
MEKK3 is a mitogen-activated protein kinase kinase kinase that participates in various signaling pathways. One of its functions is to activate the ERK5 signal pathway by phosphorylating and activating MEK5. MEKK3 and MEK5 each harbors a PB1 domain in the N-terminus, and they form a heterodimer via PB1-PB1 domain interaction that was reported to be indispensable to the activation of MEK5. Using NMR spectroscopy, we show here that a prolyl isomerization of the Gln38-Pro39 bond is present in MEKK3 PB1, which is the first case of structural heterogeneity within PB1 domains. We have solved the solution structures of both isomers and found a major difference between them in the Pro39 region. Residues Gly37-Leu40 form a type VIb beta-turn in the cis conformation, whereas no obvious character of beta-turn was observed in the trans conformation. Backbone dynamics studies have unraveled internal motions in the beta3/beta4-turn on a microsecond-millisecond time scale. Further investigation of its binding properties with MEK5 PB1 has demonstrated that MEKK3 PB1 binds MEK5 PB1 tightly with a Kd of about 10(-8) M. Mutagenesis analysis revealed that residues in the basic cluster of MEKK3 PB1 contributes differently to the PB1-PB1 interaction. Residues Lys 7 and Arg 5 play important roles in the interaction with MEK5 PB1. Taken together, this study provides new insights into structural details of MEKK3 PB1 and its binding properties with MEK5 PB1.
Insight into the binding properties of MEKK3 PB1 to MEK5 PB1 from its solution structure.,Hu Q, Shen W, Huang H, Liu J, Zhang J, Huang X, Wu J, Shi Y Biochemistry. 2007 Nov 27;46(47):13478-89. Epub 2007 Nov 7. PMID:17985933[5]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Ellinger-Ziegelbauer H, Brown K, Kelly K, Siebenlist U. Direct activation of the stress-activated protein kinase (SAPK) and extracellular signal-regulated protein kinase (ERK) pathways by an inducible mitogen-activated protein Kinase/ERK kinase kinase 3 (MEKK) derivative. J Biol Chem. 1997 Jan 31;272(5):2668-74. PMID:9006902
- ↑ Nakamura K, Johnson GL. PB1 domains of MEKK2 and MEKK3 interact with the MEK5 PB1 domain for activation of the ERK5 pathway. J Biol Chem. 2003 Sep 26;278(39):36989-92. Epub 2003 Aug 11. PMID:12912994 doi:http://dx.doi.org/10.1074/jbc.C300313200
- ↑ Huang Q, Yang J, Lin Y, Walker C, Cheng J, Liu ZG, Su B. Differential regulation of interleukin 1 receptor and Toll-like receptor signaling by MEKK3. Nat Immunol. 2004 Jan;5(1):98-103. Epub 2003 Dec 7. PMID:14661019 doi:http://dx.doi.org/10.1038/ni1014
- ↑ Bouwmeester T, Bauch A, Ruffner H, Angrand PO, Bergamini G, Croughton K, Cruciat C, Eberhard D, Gagneur J, Ghidelli S, Hopf C, Huhse B, Mangano R, Michon AM, Schirle M, Schlegl J, Schwab M, Stein MA, Bauer A, Casari G, Drewes G, Gavin AC, Jackson DB, Joberty G, Neubauer G, Rick J, Kuster B, Superti-Furga G. A physical and functional map of the human TNF-alpha/NF-kappa B signal transduction pathway. Nat Cell Biol. 2004 Feb;6(2):97-105. Epub 2004 Jan 25. PMID:14743216 doi:http://dx.doi.org/10.1038/ncb1086
- ↑ Hu Q, Shen W, Huang H, Liu J, Zhang J, Huang X, Wu J, Shi Y. Insight into the binding properties of MEKK3 PB1 to MEK5 PB1 from its solution structure. Biochemistry. 2007 Nov 27;46(47):13478-89. Epub 2007 Nov 7. PMID:17985933 doi:http://dx.doi.org/10.1021/bi701341n
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