title: A homodimeric sporamin-type trypsin inhibitor with antiproliferative, HIV reverse transcriptase-inhibitory and antifungal activities from wampee (Clausena lansium) seeds.
abstract: A homodimeric trypsin inhibitor with a molecular mass of 54 kDa was isolated from the seeds of Clausena lansium (Lour) Skeels with a very simple procedure comprising extraction with an aqueous buffer and ion exchange chromatography on CM-cellulose. It inhibited trypsin with an IC50 of 2.2 nM but was without any inhibitory effect on chymotrypsin and proteinase K. The uptake of MTT by human leukemia HL60 and hepatoma Hep G2 cells was inhibited with an IC50 of 100 microM. Translation in the cell-free rabbit reticulocyte lysate system was inhibited with an IC50 of 3.6 microM. The activity of HIV-1 reverse transcriptase was reduced in the presence of the trypsin inhibitor. The trypsin inhibitor exerted antifungal activity toward Physalospora piricola but not Mycosphaerella arachidicola, Botrytis cinerea, Fusarium oxysporum or Coprinus comatus.
authors.affiliation: Department of Biochemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China.
authors.forename: Tzi B
authors.initials: TB
authors.lastname: Ng
authors.forename: Sze K
authors.initials: SK
authors.lastname: Lam
authors.forename: Wing P
authors.initials: WP
authors.lastname: Fong
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000935:Antifungal Agents / Q000737:chemistry / Q000302:isolation & purification / Q000493:pharmacokinetics / Q000494:pharmacology*; D000972:Antineoplastic Agents, Phytogenic / Q000737:chemistry / Q000302:isolation & purification / Q000493:pharmacokinetics / Q000494:pharmacology; D019281:Dimerization; D005658:Fungi / Q000145:classification / Q000187:drug effects; D054303:HIV Reverse Transcriptase / Q000037:antagonists & inhibitors*; D018922:HL-60 Cells; D006801:Humans; D008113:Liver Neoplasms / Q000378:metabolism; D008969:Molecular Sequence Data; D010940:Plant Proteins / Q000737:chemistry*; D014176:Protein Biosynthesis / Q000187:drug effects; D011817:Rabbits; D012156:Reticulocytes / Q000378:metabolism; D018894:Reverse Transcriptase Inhibitors / Q000737:chemistry / Q000302:isolation & purification / Q000493:pharmacokinetics / Q000494:pharmacology*; D027821:Rutaceae / Q000737:chemistry*; D012639:Seeds / Q000737:chemistry; D013936:Thymidine / Q000031:analogs & derivatives / Q000378:metabolism; D014361:Trypsin Inhibitors / Q000737:chemistry / Q000302:isolation & purification / Q000493:pharmacokinetics / Q000494:pharmacology*; D014407:Tumor Cells, Cultured
chemical_list: D000935:Antifungal Agents; D000972:Antineoplastic Agents, Phytogenic; D010940:Plant Proteins; D018894:Reverse Transcriptase Inhibitors; D014361:Trypsin Inhibitors; C067142:sporamin protein, Ipomoea batatas; D054303:HIV Reverse Transcriptase; D013936:Thymidine