A method for selectively obtaining a natural variant of an enzyme having activity includes (1) a step of detecting an ORF sequence of a protein having enzyme activity from a genome database including base sequences of metagenomic DNA of environmental microbiota; (2) a step of obtaining at least one PCR clone including the ORF sequence having a full length, a partial sequence of the ORF sequence, or a base sequence encoding an amino acid sequence which is formed by deletion, substitution, or addition of at least one amino acid residue in an amino acid sequence encoded by the ORF sequence, by performing PCR cloning on at least one metagenomic DNA of the environmental microbiota by using a primer designed based on the ORF sequence; (3) a step of determining a base sequence and an amino acid sequence which is encoded by the base sequence for each PCR clone obtained in the step (2); and (4) a step of selecting a natural variant of an enzyme having activity by measuring enzyme activity of proteins encoded by each PCR clone obtained in the step (2).

The invention relates to improved alkaline phosphatases, pharmaceutical compositions comprising improved alkaline phosphatases and the use of improved alkaline phosphatases for preventing, treating or curing diseases.

The present invention provides novel genes encoding Class II acyl-ACP thioesterases and variants thereof that are active on C8, C10, C12, C14, C16, and C18 acyl-ACP substrates. The thioesterases can be introduced into transgenic organisms, including microorganisms and photosynthetic organisms, for producing fatty acids and fatty acid products.

Provided are an upstream Open Reading Frame (uORF) of a Phosphatase and Tensin homolog (PTEN) gene and a protein coded by the uORF. A potential ORF of 138 bases (45aa-uORF) in the 5UTR of the PTEN, coding an oligopeptide of 45 amino acids (named PTEN-45aa) plays an important role in the development and progression progress of tumors. Further provided are a new diagnostic and therapeutic method and a drug screening platform for PTEN expression regulation related diseases, in particular neuroglioma. Also provided is a polypeptide for treatment of PTEN expression regulation related diseases.

Provided are isolated polypeptides having beta-xylosidase activity and polynucleotides encoding the polypeptides. Also provided are nucleic acid constructs, vectors and host cells comprising the polynucleotides as well as methods of producing and using the polypeptides.

This invention belongs to the field of biotechnology, in particular to a mutant double-strand DNA (dsDNA) helicase protein nanopore derived from bovine papillomavirus and its application. The technical problem to be solved by this invention is to overcome the deficiency that the existing small-diameter protein nanopore requires an external strength or component to transport dsDNA. The technical scheme in this invention to solve the above deficiency is to provide a truncated E1-1 (306-577) protein, an E1-2 (306-605) protein and its variant derived from bovine papillomavirus double-stranded DNA helicase protein, as well as a variant of its homologous protein which is used for preparing membrane containing conductive channel, providing a new and effective choice for this field.

The present disclosure provides improved genome editing compositions and methods for editing a CBLB gene. The disclosure further provides genome edited cells for the prevention, treatment, or amelioration of at least one symptom of, a cancer, an infectious disease, an autoimmune disease, an inflammatory disease, or an immunodeficiency.

There is described a nucleic acid molecule comprising a nucleotide sequence encoding for a functional -galactosidase A protein wherein the nucleotide sequence has at least 85% identity to the sequence of SEQ ID NO. 1. Also described is a vector, host cell or transgenic animal comprising the nucleic acid molecule; and a pharmaceutical composition comprising the nucleic acid molecule or the vector. Further, the use of the nucleic acid molecule in a method of treating Fabry disease is described.