title: Characterization of a lysin from deep-sea thermophilic bacteriophage GVE2.
abstract: Thermostable enzymes from thermophiles have attracted extensive studies. However, little is known about thermophilic lysin of bacteriophage obtained from deep-sea hydrothermal vent. In this study, a lysin from deep-sea thermophilic bacteriophage Geobacillus virus E2 (GVE2) was characterized for the first time. It was found that the GVE2 lysin was highly homologous with N-acetylmuramoyl-L-alanine amidases. After expression in Escherichia coli, the recombinant GVE2 lysin was purified. The recombinant lysin was active over a range of temperature from 40 degrees C to 80 degrees C, with an optimum at 60 degrees C. Its optimal pH was 6.0, and it was stable over a wide range of pH from 4.0 to 10.0. The lysin was highly active when some enzyme inhibitors or detergents (phenylmethylsulfonyl fluoride, Tween 20, Triton X-100, and chaps) were used. However, it was strongly inhibited by sodium dodecyl sulfate and ethylene diamine tetraacetic acid. Its enzymatic activity could be slightly stimulated in the presence of Na(+) and Li(+). But the metal ions Mg(2+), Ba(2+), Zn(2+), Fe(3+), Ca(2+), and Mn(2+) at concentrations of 1 or 10 mM showed inhibitions to the lysin activity. Our study demonstrated the first characterization of lysin from deep-sea thermophilic bacteriophage.
authors.affiliation: Key Laboratory of Marine Biogenetic Resources, Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, People's Republic of China.
authors.forename: Ting
authors.initials: T
authors.lastname: Ye
authors.forename: Xiaobo
authors.initials: X
authors.lastname: Zhang
mesh_terms: D000595:Amino Acid Sequence; D001435:Bacteriophages / Q000201:enzymology* / Q000502:physiology; D003001:Cloning, Molecular; D004795:Enzyme Stability; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism; D006358:Hot Temperature; D006863:Hydrogen-Ion Concentration; D008969:Molecular Sequence Data; D009088:Mucoproteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D012623:Seawater / Q000821:virology*; D016415:Sequence Alignment; D014764:Viral Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism
chemical_list: D009088:Mucoproteins; D011994:Recombinant Proteins; D014764:Viral Proteins; C010393:lysin, gastropoda