Proline rich macrocyclic peptides (PRMPs) from marine sponges
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ABSTRACT: The mass spec data for PRMPs detected in marine sponges is deposited. Also the data differentiating leucine and isoleucine residues in cyclic peptides is deposited.
INSTRUMENT(S): Bruker ImpactII ultra-high-resolution Qq-ToF
Project description:This dataset consists of Spec-seq samples data for four tandem zinc finger proteins in human genome, each with two replicates. The Spec-seq is a medium throughput technique to characterize the binding specificity of a TF of interest to thousands of binding sites with resolution down to 0.2kT. Similar samples were deposited to NCBI GEO database before (GSE188166). The data analysis workflow for each ZFP can be accessed through https://github.com/zeropin/ZFPCookbook.
Project description:PepSAVI-MS, a mass spectrometry-based peptidomics pipeline, was implemented for antimicrobial peptide (AMP) discovery in the medicinal plant Amaranthus tricolor. This investigation revealed a novel 1.7 kDa AMP, deemed Atr-AMP1. Initial efforts to determine the sequence of Atr-AMP1 utilized chemical derivatization and enzymatic digestion to provide information about specific residues and post-translational modifications. EThcD (electron-transfer/higher-energy collision dissociation) produced extensive backbone fragmentation and facilitated de novo sequencing, the results of which were consistent with orthogonal characterization experiments. Additionally, multistage HCD (higher-energy collisional dissociation) facilitated discrimination between isobaric leucine and isoleucine. These results revealed a positively-charged proline-rich peptide present in a heterogeneous population of multiple peptidoforms, possessing several post-translational modifications including a disulfide bond, methionine oxidation, and proline hydroxylation.