The present invention provides a nitrilase mutant and application thereof in the synthesis of 1-cyanocyclohexyl acetic acid, the nitrilase mutant is obtained by mutating one or two of the amino acids at position 180 and 205 of the amino acid sequence shown in SEQ ID No. 2. In the present invention, by semi-rational design and protein molecular modification, the specific enzyme activity of the nitrilase double mutant AcN-G180D/A205C was increased by up to 1.6 folds, and the conversion rate>99%. And the reaction time was shortened to a quarter of the original using the recombinant Escherichia coli containing the nitrilase mutant to hydrolyze 1-cyanocyclohexylacetonitrile at high temperature (50° C.). Therefore, the mutants obtained by the present invention have a good application prospect in efficiently catalyzing 1-cyanocyclohexylacetonitrile to synthesize gabapentin intermediate, 1-cyanocyclohexyl acetic acid.

The present disclosure relates to the field of biotechnology, in particular to a base editing tool and use thereof. The present disclosure provides a fusion protein comprising a first nCas9 fragment, a chimeric insertion fragment, a second nCas9 fragment and two UGI fragments from N-terminus to C-terminus, wherein the chimeric insertion fragment is selected from APOBEC1 fragment or APOBEC3A fragment. The present disclosure provides a novel base editing tool that is compatible with insertion of various deaminases on the chimeric sites of nCas9. Compared with nCas9 terminal fusion base editor, the base editing tool of the present invention significantly reduce of off-targeting on both DNA and RNA, while maintaining specific targeted base editing efficiency, with higher specificity and favorable industrialization prospects.

A minimally invasive device and method for suturing papillary muscles includes drawing a suture through a first papillary muscle using a needle, drawing the suture through a second papillary muscle, and tightening the suture to move at least one of the first papillary muscle and the second papillary muscle towards the other of the first papillary muscle and the second papillary muscle.

A minimally invasive device and method for suturing papillary muscles includes drawing a suture through a first papillary muscle using a needle, drawing the suture through a second papillary muscle, and tightening the suture to move at least one of the first papillary muscle and the second papillary muscle towards the other of the first papillary muscle and the second papillary muscle.

Peptides related to certain portions of the arginine deiminase enzyme from the bacterium Streptococcus cristatus are provided that disrupt the formation and composition of biofilms containing the oral pathogen Porphyromonas gingivalis, and also modulate the virulence of P. gingivalis. Pharmaceutical compositions containing such peptides and method of using the same are disclosed.

Peptides related to certain portions of the arginine deiminase enzyme from the bacterium Streptococcus cristatus are provided that disrupt the formation and composition of biofilms containing the oral pathogen Porphyromonas gingivalis, and also modulate the virulence of P. gingivalis. Pharmaceutical compositions containing such peptides and method of using the same are disclosed.

Disclosed herein is a technology to perform programmable RNA editing at single-nucleotide resolution using RNA-targeting CRISPR/Cas9. This approach, which Applicants have termed “Cas9-directed RNA editing” or “CREDIT,” provides a means to reversibly alter genetic information in a temporal manner, unlike traditional CRISPR/Cas9 driven genomic engineering which relies on permanently altering DNA sequence.

Object: To provide an antisense guide RNA for editing a target RNA by ADAR.

Solution: An antisense guide RNA for editing a target RNA by ADAR, containing at least one functional region and an antisense region that is complementary to a portion of the target RNA and can form a double strand with the target RNA, in which the at least one functional region is linked to the antisense region, and in which the guide RNA does not substantially contain an ADAR-recruiting base sequence.

The present disclosure provides for systems, methods, and compositions for targeting nucleic acids. In particular, the invention provides mutated Cas13 proteins and their use in modifying target sequences as well as mutated Cas13 nucleic acid sequences and vectors encoding mutated Cas13 proteins and vector systems or CRISPR-Cas13 systems.

The present disclosure provides for systems, methods, and compositions for targeting nucleic acids. In particular, the invention provides mutated Cas13 proteins and their use in modifying target sequences as well as mutated Cas13 nucleic acid sequences and vectors encoding mutated Cas13 proteins and vector systems or CRISPR-Cas13 systems.