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J. Biol. Chem., Vol. 275, Issue 27, 20374-20381, July 7, 2000
From the Antibacterial proteins are components of the
innate immune system found in many organisms and produced by a variety
of cell types. Human blood platelets contain a number of antibacterial proteins in their
Thrombocidins, Microbicidal Proteins from Human Blood Platelets,
Are C-terminal Deletion Products of CXC Chemokines*
§,
¶,
,
,
,
,
,
, and
Department of Medical Microbiology, Academic
Medical Center, University of Amsterdam, 1105 AZ Amsterdam, The
Netherlands, the ** Department of Immunohematology and Blood Bank,
Leiden University Medical Center, 2333 AA Leiden, The Netherlands, the

Department of Microbiology, University of
Groningen, 97-51 AA Haren, The Netherlands, the
§§ Department of Immunology and Cell Biology,
Forschungszentrum Borstel, D-23845 Borstel, Germany, and the

Department of Chemical Technology, Institute of
Biomedical Technology, University of Twente, 7500 AE
Enschede, The Netherlands
-granules that are released upon thrombin
activation. The present study was designed to purify these proteins
obtained from human platelets and to characterize them chemically and
biologically. Two antibacterial proteins were purified from platelet
granules in a two-step protocol using cation exchange chromatography
and continuous acid urea polyacrylamide gel electrophoresis and were designated thrombocidin (TC)-1 and TC-2. Characterization of these proteins using mass spectrometry and N-terminal sequencing revealed that TC-1 and TC-2 are variants of the CXC chemokines
neutrophil-activating peptide-2 and connective tissue-activating
peptide-III, respectively. TC-1 and TC-2 differ from these chemokines
by a C-terminal truncation of 2 amino acids. Both TCs, but not
neutrophil-activating peptide-2 and connective tissue-activating
peptide-III, were bactericidal for Bacillus subtilis,
Escherichia coli, Staphylococcus aureus, and
Lactococcus lactis and fungicidal for Cryptococcus
neoformans. Killing of B. subtilis by either TC
appeared to be very rapid. Because TCs were unable to dissipate the
membrane potential of L. lactis, the mechanism of
TC-mediated killing most probably does not involve pore formation.
*
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.
Supported by Netherlands Heart Foundation Grant 94.129.
¶¶
Supported in part by the Deutsche
Forschungsgemeinschaft, Sonderforschungsbereich 367, Projekt C4.
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