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J Biol Chem, Vol. 275, Issue 2, 1279-1286, January 14, 2000
From the Faculty of Integrated Arts and Sciences, Tokushima
University, Tokushima 770-8502, Japan
A novel eosinophil chemotactic cytokine (ECF-L)
was purified from the culture supernatant of splenocytes of mice by a
combination of anion-exchange chromatography, Procion red-agarose
affinity chromatography, size exclusion high performance liquid
chromatography (HPLC), and reverse phase HPLC. The
NH2-terminal amino acid sequence was determined by
direct protein sequencing. An ECF-L cDNA clone of 1,506 nucleotides
was isolated from a cDNA library, and the nucleotide sequence
predicted a mature protein of 397 amino acids. A recombinant ECF-L
showed a level of eosinophil chemotactic activity comparable with that
of natural ECF-L, and the activity was inhibited by a monoclonal
antibody to ECF-L. ECF-L also attracted T lymphocytes and bone marrow
polymorphonuclear leukocytes in vitro, whereas it caused
selective extravasation of eosinophils in vivo. ECF-L mRNA was highly expressed in spleen, bone marrow, lung, and heart. A comprehensive GenBank data base search revealed that ECF-L is a
chitinase family protein. ECF-L retains those amino acids highly conserved among chitinase family proteins, but Asp and Glu residues essential for the proton donation in hydrolysis were replaced by Asn
and Gln, respectively. Although ECF-L contains a consensus CXC sequence near the NH2 terminus akin to
chemokine family proteins, the rest of ECF-L shows poor homology with chemokines.
The nucleotide sequence reported in this paper has been submitted
to the DDBJ/GenBankTM/EBI Data Bank with accession number
D87757.
Identification of a Novel Eosinophil Chemotactic Cytokine
(ECF-L) as a Chitinase Family Protein*
,
*
This work was supported in part by Grants 06670260, 09309010, and 10670229 from the Ministry of Education, Science, Sports, and Culture, Japan.The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in
accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
To whom correspondence should be addressed. Tel.: 88-656-7261; Fax:
88-656-7298; E-mail: ohashi@ias.tokushima-u.ac.jp.
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