Cited by 76Connective Tissue Growth Factor ResearchCell Adhesion Molecules ResearchBone and Dental Protein Studies

Identification of a Novel Integrin αMβ2 Binding Site in CCN1 (CYR61), a Matricellular Protein Expressed in Healing Wounds and Atherosclerotic Lesions

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Schober, Joseph M., Lau, Lester F., Ugarova, Tatiana P., Lam, Stephen C.-T.·2003·Journal of Biological Chemistry

Abstract

CCN1 (cysteine-rich 61) and CCN2 (connective tissue growth factor) are growth factor-inducible immediate-early gene products found in atherosclerotic lesions, restenosed blood vessels, and healing cutaneous wounds. Both CCN proteins have been shown to support cell adhesion and induce cell migration through interaction with integrin receptors. Recently, we have identified integrin alphaMbeta2 as the major adhesion receptor mediating monocyte adhesion to CCN1 and CCN2 and have shown that the alphaMI domain binds specifically to both proteins. In the present study, we demonstrated that activated monocytes adhered to a synthetic peptide (CCN1-H2, SSVKKYRPKYCGS) derived from a conserved region within the CCN1 C-terminal domain, and this process was blocked by the anti-alphaM monoclonal antibody 2LPM19c. Consistently, a glutathione S-transferase (GST) fusion protein containing the alphaMI domain (GST-alphaMI) bound to immobilized CCN1-H2 as well as to the corresponding H2 sequence in CCN2 (CCN2-H2, TSVKTYRAKFCGV). By contrast, a scrambled CCN1-H2 peptide and an 18-residue peptide derived from an adjacent sequence of CCN1-H2 failed to support monocyte adhesion or alphaMI domain binding. To confirm that the CCN1-H2 sequence within the CCN1 protein mediates alphaMbeta2 interaction, we developed an anti-peptide antibody against CCN1-H2 and showed that it specifically blocked GST-alphaMI binding to intact CCN1. Collectively, these results identify the H2 sequence in CCN1 and CCN2 as a novel integrin alphaMbeta2 binding motif that bears no apparent homology to any alphaMbeta2 binding sequence reported to date.

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  • CCN1 lacks the canonical RGD sequence that binds many integrins; instead, specific non-canonical binding sites for several integrins have been identified.

    “CCN1 does not contain the canonical RGD sequence that can bind a number of integrins [54]. Instead, specific non-canonical binding sites of CCN1 for several integrins have been identified (Fig. 1) [63–66].”

    From CCN1/CYR61: the very model of a modern matricellular protein (2011) · cites this paper as [63]

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Research works printed but not linked: 2

  1. Babic, A. M., Kireeva, M. L., Kolesnikova, T. V., and Lau, L. F. (1998) Proc. Natl. Acad. Sci. U. S. A. 95, 6355-6360
  2. Springer, T. A. (1994) Cell 76, 301-314

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Authors
Schober, J. M., Lau, L. F., Ugarova, T. P., & Lam, S. C.-T.
Affiliations
  • University of Illinois Chicago (US)
  • Cleveland Clinic (US)
Corresponding author
Lam, Stephen C.-T.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2003-07
Volume
278
Issue
28
Pages
25808-25815
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2087823284
Cited by
76
References
41
Citations by year
2025: 1 · 2024: 6 · 2023: 1 · 2021: 4 · 2020: 1 · 2019: 1 · 2018: 2 · 2016: 5 · 2015: 3 · 2014: 4 · 2013: 6 · 2012: 5
FWCI
2.06
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
  • American Heart Association
  • National Institutes of Health (5r01ca080080-05)
  • National Heart, Lung, and Blood Institute (HL07829, HL41793, HL 63199, R01HL063199)
  • National Cancer Institute (CA-80080, R01CA046565, CA-46565)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Connective Tissue Growth Factor Research
  • Health Sciences › Medicine › Immunology and Allergy › Cell Adhesion Molecules Research
  • Health Sciences › Medicine › Rheumatology › Bone and Dental Protein Studies
Keywords
CYR61, connective tissue growth factor, Mac-1, integrin-binding motif, monocyte adhesion, matricellular proteins, wound healing, atherosclerosis, cell adhesion, cell migration, peptide binding
MeSH terms
Amino Acid Sequence, Arteriosclerosis, Binding Sites, Cell Adhesion, Dose-Response Relationship, Drug, Glutathione Transferase, Humans, Manganese, Molecular Sequence Data, Monocytes, Peptides, Protein Binding, Recombinant Fusion Proteins, Wound Healing, Macrophage-1 Antigen, Protein Structure, Tertiary, Immediate-Early Proteins, Amino Acid Motifs, Intercellular Signaling Peptides and Proteins, Cysteine-Rich Protein 61

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