Provided herein are genetically modified microbes. In one embodiment, a genetically modified microbe includes an exogenous polynucleotide that includes a pheromone-responsive region. In one embodiment, the pheromone-responsive region is derived from a conjugative plasmid from a member of the genus Enterococcus spp. The pheromone-responsive region includes a pheromone-responsive promoter and an operably linked coding region encoding an antimicrobial peptide. In one embodiment, a genetically modified microbe includes an exogenous polynucleotide that includes a promoter and an operably linked coding sequence encoding an antimicrobial peptide, where expression of the coding region is controlled by a modulator polypeptide and is altered by a modulating agent, and where the coding region encodes an antimicrobial peptide.

Provided herein are anti-infective peptides and uses thereof. Such anti-infective peptides are useful against bacteria and viruses. Also provided herein are compositions comprising said anti-infective peptides.

The present application discloses a plant senescence accelerator named IDL7 mature polypeptide, and its preparation method and an application thereof. The application belongs to the field of a plant senescence accelerator, and the IDL7 mature polypeptide serves as a major functional ingredient with the following amino acid sequence: F-G-S-L-V-L-N-A-L-P-K-G-S-R-P-G-S-G-P-S-K-K-T-N. The IDL7 mature polypeptide plant senescence accelerator may promote the leaf senescence of plants without other additional adverse manifestations, thus this application has strong field operability.

A polypeptide fragment C (MP-C) has an amino acid sequence shown in SEQ ID NO: 1, in which an amino acid Xaa at position 9 is Tyr, Val, Gly, Ser, or Gln, an amino acid Xaa at position 20 is Ser, Gln, Glu, or Tyr, an amino acid Xaa at position 30 is Asn, Thr, Ser, Pro, or Leu, and an amino acid Xaa at position 42 is Gly, Arg, Met, or absent. The MP-C can significantly improve the colonic pathologic morphology and decrease a disease activity index (DAI) and a colonic histopathologic score in an inflammatory bowel disease (IBD) mouse model, and shows the ability to interfere with the occurrence of IBD in mice.

Complexes containing a labeled polypeptide and an antibody, and the use of such complexes as research, diagnostic, and clinical tools, are described herein.

This disclosure relates to the fields of cell biology and the modulation of cell signaling associated with migration and localization of immune cells and aberrant cellular proliferation, migration, and malignancy. Also disclosed are peptides effective in modulating stem cell mobilization, treating cancer, enhancing chemotherapy or immunotherapy, treating genetic disorders, and as immunomodulatory agents. Also disclosed are peptides effective in the treatment of fibrotic diseases. The present disclosure also provides peptides and peptide analogs and the use thereof in methods of treating diseases relating to CXCR4.

A bio-related substance bonded to a branched and degradable polyethylene glycol derivative that is degraded in the cells represented by the following formula (A):

##STR00001##

wherein each symbol is as defined in the present specification, is provided by the present invention.

A synthesis method for low-racemization impurity liraglutide comprises the following steps: performing synthesis to obtain a propeptide, coupling 2 to 5 peptides comprising Thr-Phe on the propeptide by using a solid-phase synthesis method; further, performing solid-phase synthesis to obtain a liraglutide resin; the liraglutide resin is cracked after modification, or the liraglutide resin is directly cracked, purified and frozen dry, so as to obtain the liraglutide. The provided liraglutide synthesis method effectively restrains or reduces the generation of racemization impurity D-Thr.sup.5 highly similar to a product property, which facilitates the purification of the coarse liraglutide, and the high yield of the liraglutide is ensured, thereby greatly reducing production costs; during the synthesis of the liraglutide, the syntheses between dipeptide fragments, tripeptide fragments, the tetrapeptide fragments and pentapeptide fragments and the Gly-resin or the syntheses between the combination of the dipeptide fragments, the tripeptide fragments, the tetrapeptide fragments and pentapeptide fragments and the Gly resin can be carried out at the same time, and accordingly the synthesis time is shortened to some extent.

A multi-arm, degradable polyethylene glycol derivative with a high molecular weight that does not cause vacuolation of cells is provided. A degradable polyethylene glycol derivative represented by the following formula (1):

##STR00001##

wherein n1 and n2 are each independently 45-950, W.sup.1 and W.sup.2 are each independently an oligopeptide of 2-47 residues, a1 and a2 are each independently 1-8, Q is a hydrocarbon chain having 2-12 carbon atoms and optionally containing an oxygen atom and/or a nitrogen atom, X.sup.1 and X.sup.2 are each independently a functional group capable of reacting with a bio-related substance, and L.sup.1, L.sup.2, L.sup.3, L.sup.4, L.sup.5 and L.sup.6 are each independently a divalent spacer.

Peptides and Peptide-lipid conjugates are provided in which the peptide has the general Formula (I)

##STR00001## wherein, A.sup.1 is selected from serine, threonine, O—C.sub.1-6 alkyl serine, and O—C.sub.1-6 alkyl threonine; A.sup.2 is selected from serine, threonine, O—C.sub.1-6 alkyl serine, and O—C.sub.1-6 alkyl threonine; A.sup.3 is selected from glutamic acid, glutamine, asparagine, and aspartic acid; A.sup.4 is proline; each A.sup.5 is independently selected from a natural or modified amino acid;
The peptide-lipid conjugates can be used in lipid formulations for the delivery of nucleic acids.