贝类育苗.pdf

Mar. Drugs 2008, 6, 418-430; DOI: 10.3390/m OPEN ACCESS Marine Drugs ISSN 1660-3397 /marinedrugs Article Purification, Characterization and in vitro Anti-Tumor Activity of Proteins from Arca subcrenata Lischke Liyan Song 1,2, Shengfang Ren 2, Rongmin Yu 2,*, Chunyan Yan 2, Tingfei Li 2 and Yu Zhao 1,* 1 College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, P.R. China 2 College of Pharmacy, Jinan University, Guangzhou 510632, P.R. China * Authors to whom correspondence should be addressed; Tel.: +86-20 Fax: +86-20- Email: tyrm@ (R.M. Yu); and Tel.: +86-571 Fax: +86-571 Email: dryuzhao@ (Y. Zhao) Received: 2 February 2008; in revised form:8 April 2008 / Accepted: 26 June 2008 / Published: 10 July 2008 Abstract: Two purified proteins G-6 and G-4-2 were obtained from Arca subcrenata Lischke using the homogenization, salting-out with ammonium sulfate, ion-exchange chromatography and gel filtration chromatography techniques. The purity of G-6 and G-4-2 was over 96%, as measured by RP-HPLC. G-6 and G-4-2 were measured by SDSand IEFto have molecular weights of 8.2 kDa and 16.0 kDa, and isoelectric points of 6.6 and 6.1, respectively. The amino acid constituents of G-6 and G-4-2 were also determined. The existence of saccharides in G-6 was demonstrated by the phenol-sulfuric acid method. G-6 and G-4-2 inhibited the pr