potential rule as important class of multifunctional biomolecules. Their putative roles as signaling molecules in the chemical ecology context is more and more considered. Thus, determination of absolute configuration of cyclic dipeptides is of significant importance. As a part of our on-going research on bioactive natural compounds from Pacific Axinellidae marinesponges, a scrutinized study of secondary
Cyclic dipeptide (CDP) based radical-scavenging antioxidant molecules have been developed through structure–activity screening of rationally designed symmetric and asymmetric aromatic molecules. The antioxidant efficiencies of the designed CDPs were evaluated against the standard antioxidants ascorbic acid (natural) and butylated hydroxyanisole (a synthetic ingredient used in food, cosmetics, and medicine)
Aminopeptidase from Streptomyces thermocyaneoviolaceus NBRC14271 was engineered into transaminopeptidase and used to catalyze an aminolysis reaction to give linear and cyclicdipeptides from cost-effective substrates such as the ester derivatives of amino acids.
Cyclo(<scp>d</scp>-Tyr-<scp>d</scp>-Phe): a new antibacterial, anticancer, and antioxidant cyclic dipeptide from<i>Bacillus</i>sp. N strain associated with a rhabditid entomopathogenic nematode
作者:S. Nishanth Kumar、C. Dileep、C. Mohandas、Bala Nambisan、Jayaprakas Ca
DOI:10.1002/psc.2594
日期:2014.3
A new microbial cyclicdipeptide (diketopiperazine), cyclo(d‐Tyr‐d‐Phe) was isolated for the first time from the ethyl acetate extract of fermented modified nutrient broth of Bacillus sp. Nstrainassociated with rhabditidEntomopathogenicnematode. Antibacterial activity of the compound was determined by minimum inhibitory concentration and agar disc diffusion method against medically important bacteria
Microorganisms embedded in a biofilm are significantly more resistant to antimicrobial agents and the defences of the human immune system, than their planktonic counterpart. Consequently, compounds that can inhibit biofilm formation are of great interest for novel therapeutics. In this study, a screening approach was used to identify novel cyclic dipeptides that have anti-biofilm activity against oral pathogens. Five new active compounds were identified that prevent biofilm formation by the cariogenic bacterium Streptococcus mutans and the pathogenic fungus Candida albicans. These compounds also inhibit the adherence of microorganisms to a hydroxylapatite surface. Further investigations were conducted on these compounds to establish the structure-activity relationship, and it was deduced that the common cleft pattern is required for these molecules to act effectively against biofilms.