Characterization and Purification of the Chorionic Gonadotropin-Like Protein Binding Site In Candida Albicans
In: Endocrine Research, Jg. 20 (1994-02-01), Heft 1, S. 1-19
serialPeriodical
Zugriff:
Recent studies from our laboratory have shown that human chorionic gonadotropin (hCG), human luteinizing hormone (hLH), and CG-like proteins from Xanthomonas maltophilia(xCG) and Candida albicans(CaCGLP) induce Candida albicanstransition from blastospores to hyphal forms. Xanthomonas maltophiliaCG-like protein (xCG), hCG, and hLH also bind to Candida albicansblastospores with a high-affinity nM Kd, indicating that these substances can control Candida albicanspathogenicity. The work reported herein describes the purification of the binding site for these CG-like proteins from Candida albicans.The purification developed involved alcohol extraction followed by affinity chromatography. The product obtained was a protein of 64–69 kDa, as analyzed by sodium dodecyl sulfate-polyacrylamide electrophoresis (SDS-PAGE), Western blot and Sephadex G-100 column chromatography. This binding site reacted in a Western blot with both 125I-hCG and 125I-CaCGLP.Purified CaCGLP was able to displace specifically 125I-hCG bound to Candida albicansblastospores. Scatchard plot analysis showed that the Kd of this reaction was of high affinity in the nM range, and also indicated the presence of one single binding site. These results lead us to conclude: 1) Candida albicanspossesses a binding site which is able to bind hCG, hLH and CG-like proteins from Xanthomonas maltophiliaand Candida albicans; 2) This binding site is a hydrophobic protein of approximately 64 kDa and; 3) We postulate that CaCGLP is the natural ligand for this binding site and this system is used to control Candida albicanstransition and, therefore, pathogenicity.
Titel: |
Characterization and Purification of the Chorionic Gonadotropin-Like Protein Binding Site In Candida Albicans
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Autor/in / Beteiligte Person: | Caticha, Omar ; Odell, William D. |
Zeitschrift: | Endocrine Research, Jg. 20 (1994-02-01), Heft 1, S. 1-19 |
Veröffentlichung: | 1994 |
Medientyp: | serialPeriodical |
ISSN: | 0743-5800 (print) ; 1532-4206 (print) |
DOI: | 10.1080/07435809409035852 |
Sonstiges: |
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