Cited by 104Protein Kinase Regulation and GTPase SignalingProtein Tyrosine PhosphatasesMelanoma and MAPK Pathways

Crystal Structure of the P38α-MAPKAP Kinase 2 Heterodimer

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Haar, Ernst ter, Prabakhar, Prakash, Liu, Xun, Lepre, Christopher·2007·Journal of Biological Chemistry

Abstract

The p38 signaling pathway is activated in response to cell stress and induces production of proinflammatory cytokines. P38alpha is phosphorylated and activated in response to cell stress by MKK3 and MKK6 and in turn phosphorylates a number of substrates, including MAPKAP kinase 2 (MK2). We have determined the crystal structure of the unphosphorylated p38alpha-MK2 heterodimer. The C-terminal regulatory domain of MK2 binds in the docking groove of p38alpha, and the ATP-binding sites of both kinases are at the heterodimer interface. The conformation suggests an extra mechanism in addition to the regulation of the p38alpha and MK2 phosphorylation states that prevents phosphorylation of substrates in the absence of cell stress. Addition of constitutively active MKK6-DD results in rapid phosphorylation of the p38alpha-MK2 heterodimer.

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  • p38 is capable of binding KIM peptides bi-directionally, in a C-to-N versus the more common N-to-C direction.

    “In addition, while the structure of p38 bound to its substrate, the MAPKAP-2 (MK2) kinase was the first structure to show that p38 is capable of binding KIM peptides bi-directionally 54,55 (that is, in a C-to-N, versus the more common N-to-C direction; Figs.2(A,B))”

    From Molecular basis of MAP kinase regulation (2013) · cites this paper as [54]

  • ERK2-pepRSK1 and ERK2-pepMNK1 peptides bound in a reversed N- to C-terminal orientation compared with D-motif peptides, similar to pepMK2 binding to p38α.

    “These peptides bound in a reversed N- to C-terminal orientation compared to D-motif peptides (Fig. 3B-D), similar to the binding of pepMK2 to p38α (31).”

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Authors
Haar, E. T., Prabakhar, P., Liu, X., & Lepre, C.
Affiliations
Vertex Pharmaceuticals (United States) (US)
Corresponding author
Haar, Ernst ter
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2007-03
Volume
282
Issue
13
Pages
9733-9739
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2117941384
Cited by
100
References
40
Citations by year
2026: 4 · 2025: 4 · 2024: 2 · 2023: 6 · 2022: 4 · 2021: 6 · 2020: 5 · 2019: 2 · 2018: 3 · 2017: 4 · 2016: 4 · 2015: 5 · 2014: 5 · 2013: 6 · 2012: 8
FWCI
2.91
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Tyrosine Phosphatases
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Melanoma and MAPK Pathways
Keywords
p38α MAPK, MAPKAPK2, heterodimer, crystal structure, MKK3, MKK6, phosphorylation regulation, ATP binding site, inflammatory cytokines
MeSH terms
MAP-Kinase-Activated Kinase 2, Adenosine Triphosphate, Binding Sites, Humans, Protein Serine-Threonine Kinases, Protein Structure, Tertiary, Crystallography, X-Ray, Dimerization, Intracellular Signaling Peptides and Proteins, Mitogen-Activated Protein Kinase 14

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