title: Alpha-momorcharin: a ribosome-inactivating protein from Momordica charantia, possessing DNA cleavage properties.
abstract: Ribosome-inactivating proteins (RIPs) function to inhibit protein synthesis through the removal of specific adenine residues from eukaryotic ribosomal RNA and rending the 60S subunit unable to bind elongation factor 2. They have received much attention in biological and biomedical research due to their unique activities toward tumor cells, as well as the important roles in plant defense. Alpha-momorcharin (α-MC), a member of the type I family of RIPs, is rich in the seeds of Momordica charantia L. Previous studies demonstrated that α-MC is an effective antifungal and antibacterial protein. In this study, a detailed analysis of the DNase-like activity of α-MC was conducted. Results showed that the DNase-like activity toward plasmid DNA was time-dependent, temperature-related, and pH-stable. Moreover, a requirement for divalent metal ions in the catalytic domain of α-MC was confirmed. Additionally, Tyr(93) was found to be a critical residue for the DNase-like activity, while Tyr(134), Glu(183), Arg(186), and Trp(215) were activity-related residues. This study on the chemico-physical properties and mechanism of action of α-MC will improve its utilization in scientific research, as well as its potential industrial uses. These results may also assist in the characterization and elucidation of the DNase-like enzymatic properties of other RIPs.
authors.affiliation: College of Life Sciences, Wuhan University, Ba-Yi Street, Hubei Wuhan, 430072, P.R. China. yiding@whu.edu.cn.
authors.forename: Shuzhen
authors.initials: S
authors.lastname: Wang
authors.forename: Yinzhen
authors.initials: Y
authors.lastname: Zheng
authors.forename: Junjie
authors.initials: J
authors.lastname: Yan
authors.forename: Zhixuan
authors.initials: Z
authors.lastname: Zhu
authors.forename: Zhihua
authors.initials: Z
authors.lastname: Wu
authors.forename: Yi
authors.initials: Y
authors.lastname: Ding
mesh_terms: D053837:DNA Cleavage; D003851:Deoxyribonucleases / Q000737:chemistry; D029777:Momordica charantia / Q000737:chemistry; D020652:Peptide Elongation Factor 2 / Q000737:chemistry / Q000378:metabolism*; D010957:Plasmids / Q000737:chemistry; D014176:Protein Biosynthesis / Q000235:genetics*; D012335:RNA, Ribosomal / Q000737:chemistry / Q000378:metabolism; D054788:Ribosome Inactivating Proteins / Q000737:chemistry*; D054789:Ribosome Inactivating Proteins, Type 1 / Q000737:chemistry*; D012270:Ribosomes / Q000737:chemistry* / Q000235:genetics; D012639:Seeds / Q000737:chemistry
chemical_list: D020652:Peptide Elongation Factor 2; D012335:RNA, Ribosomal; D054789:Ribosome Inactivating Proteins, Type 1; C039582:MMC protein, Momordica charantia; D003851:Deoxyribonucleases; D054788:Ribosome Inactivating Proteins