Cited by 23Protein Tyrosine PhosphatasesProtein Kinase Regulation and GTPase SignalingProtease and Inhibitor Mechanisms

Molecular Determinants of Substrate Recognition in Hematopoietic Protein-tyrosine Phosphatase

Open access
Huang, Zhonghui, Zhou, Bo, Zhang, Zhong-Yin·2004·Journal of Biological Chemistry

Abstract

The extracellular signal-regulated protein kinase 2 (ERK2) plays a central role in cellular proliferation and differentiation. Full activation of ERK2 requires dual phosphorylation of Thr183 and Tyr185 in the activation loop. Tyr185 dephosphorylation by the hematopoietic protein-tyrosine phosphatase (HePTP) represents an important mechanism for down-regulating ERK2 activity. The bisphosphorylated ERK2 is a highly efficient substrate for HePTP with a kcat/Km of 2.6 x 10(6) m(-1) s(-1). In contrast, the kcat/Km values for the HePTP-catalyzed hydrolysis of Tyr(P) peptides are 3 orders of magnitude lower. To gain insight into the molecular basis for HePTP substrate specificity, we analyzed the effects of altering structural features unique to HePTP on the HePTP-catalyzed hydrolysis of p-nitrophenyl phosphate, Tyr(P) peptides, and its physiological substrate ERK2. Our results suggest that substrate specificity is conferred upon HePTP by both negative and positive selections. To avoid nonspecific tyrosine dephosphorylation, HePTP employs Thr106 in the substrate recognition loop as a key negative determinant to restrain its protein-tyrosine phosphatase activity. The extremely high efficiency and fidelity of ERK2 dephosphorylation by HePTP is achieved by a bipartite protein-protein interaction mechanism, in which docking interactions between the kinase interaction motif in HePTP and the common docking site in ERK2 promote the HePTP-catalyzed ERK2 dephosphorylation (approximately 20-fold increase in kcat/Km) by increasing the local substrate concentration, and second site interactions between the HePTP catalytic site and the ERK2 substrate-binding region enhance catalysis (approximately 20-fold increase in kcat/Km) by organizing the catalytic residues with respect to Tyr(P)185 for optimal phosphoryl transfer.

Integrity signals

Registry

Crossref · 10.1074/jbc.m407820200

Cites

53 of 53 references verified0 citation errors · 0 not checkable

Statistics

Recomputing p-values needs the paper’s full text.

Claims the paper makes

We couldn’t retrieve this paper’s full text, so its claims and self-check weren’t run. The registry and citation checks still apply.

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • The structural and biochemical analysis, together with other studies, clarified the minimal sequence requirements for linear motifs to bind the MAPK docking groove.

    “Our structural and biochemical analysis in combination with other studies clarified the minimal sequence requirements for linear motifs to bind the MAPK docking groove (42-47).”

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Huang, Z., Zhou, B., & Zhang, Z.-Y.
Affiliations
Albert Einstein College of Medicine (US)
Corresponding author
Zhang, Zhong-Yin
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2004-12
Volume
279
Issue
50
Pages
52150-52159
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2114427980
Cited by
23
References
53
Citations by year
2022: 1 · 2021: 1 · 2015: 1 · 2014: 2 · 2013: 5 · 2012: 1
FWCI
1.07
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
National Cancer Institute (CA-69202, R01CA069202)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Tyrosine Phosphatases
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Protease and Inhibitor Mechanisms
Keywords
ERK2, substrate specificity, tyrosine dephosphorylation, protein-protein docking, catalytic efficiency, p-nitrophenyl phosphate
MeSH terms
Amino Acid Sequence, Aniline Compounds, Animals, Base Sequence, DNA, Hematopoietic System, Hydrolysis, Kinetics, Molecular Sequence Data, Organophosphorus Compounds, Phosphorylation, Recombinant Proteins, Substrate Specificity, Tyrosine, Mutagenesis, Site-Directed, Protein Tyrosine Phosphatases, Sequence Homology, Amino Acid, Mitogen-Activated Protein Kinase 1, Intracellular Signaling Peptides and Proteins, Protein Tyrosine Phosphatase, Non-Receptor Type 6, In Vitro Techniques

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review