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A multiple protease strategy to optimise shotgun proteomics of medicinal cannabis mature buds.

ABSTRACT: Earlier this year we published a method article aimed at optimising protein extraction from mature buds of medicinal cannabis for trypsin-based shotgun proteomics (Vincent, D., et al. Molecules 2019, 24, 659). We then developed a top-down proteomics (TDP) method (Vincent, D., et al. Proteomes 2019, 7, 33). This follow-up study aims at optimising the digestion of medicinal cannabis proteins for identification purposes by bottom-up and middle-down proteomics (BUP and MDP). Four proteases, namely a mixture of trypsin/LysC, GluC, and chymotrypsin, which target different amino acids (AAs) and therefore are orthogonal and cleave proteins more or less frequently, were tested both on their own as well as sequentially or pooled, followed by nLC-MS/MS analyses of the peptide digests. Bovine serum albumin (BSA, 66 kDa) was used as a control of digestion efficiency. With this multiple protease strategy, BSA was reproducibly 97% sequenced, with peptides ranging from 0.7 to 6.4 kD containing 5 to 54 AA residues with 0 to 6 miscleavages. The proteome of mature apical buds from medicinal cannabis was explored more in depth with the identification of 27,123 peptides matching 494 unique accessions corresponding to 229 unique proteins from Cannabis sativa and close relatives, including 130 (57%) additional annotations when the list is compared to that of our previous BUP study (Vincent, D., et al. Molecules 2019, 24, 659). Almost half of the medicinal cannabis proteins were identified with 100% sequence coverage, with peptides composed of 7 to 91 AA residues with up to 9 miscleavages and ranging from 0.6 to 10 kDa, thus falling into the MDP domain. Many post-translational modifications (PTMs) were identified, such as oxidation, phosphorylations, and N-terminus acetylations. This method will pave the way for deeper proteome exploration of the reproductive organs of medicinal cannabis, and therefore for molecular phenotyping within breeding programs. doi:10.3390/ijms20225630

INSTRUMENT(S): nLC-ESI-LTQ-Orbitrap mass analyser

ORGANISM(S): Cannabis Sativa (marijuana)

SUBMITTER: Delphine Vincent

PROVIDER: MSV000084216 | MassIVE | Mon Aug 19 20:26:00 BST 2019

REPOSITORIES: MassIVE

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Project description:Interventions: Participants of this study will be receiving prescribed medicinal cannabis product/s via their treating clinician, as per standard of care. Enrolment into the study requires their clinician to consent participants and provide relevant medical history information, prescription information and updates and regular adverse event reporting throughout the study duration (12 months observation per participant). Participants will be asked to complete a total of 14 questionnaires at set time points throughout the study. The study progress questionnaire including additional validated measures of health-related quality of life, medication adherence and patient reported change will be completed at enrolment, and months 1, 3, 6, 9 and 12 post-enrolment or until the participant ceases medicinal cannabis treatment (if prior to 12 months post-enrolment). A short-form questionnaire focused on side effect reporting, current dose and changes to other concomitant medications will be completed at months 2, 4, 5, 7, 8, 10 and 11 post-enrolment or until the participant ceases medicinal cannabis treatment (if prior to 12 months post-enrolment). It is anticipated that each questionnaire will take between 5-30 minutes to complete, requiring a total of 30 minutes maximum participation each month for the 12 months of the study. Clinicians will be asked to complete the baseline enrolment form (10 minutes to complete) for each patient at study enrolment as well as adverse event monitoring questionnaires, each taking 5-10 minutes to complete every 3 months for the period that they have patients enrolled in the study. Primary outcome(s): The type of medicinal cannabis product/s prescribed (including the formulation, prescribed dosage and underlying medical condition) as collected by study-specific questionnaires. [Collected at baseline, and then monthly for a 12 month period post-enrolment. ];Number of adverse and serious adverse events experienced that are related to medicinal cannabis treatment, including but not limited to, dry mouth, somnolence and gastrointestinal upset, as measured by study-specific questionnaires. These will be captured by clinicians at clinical examinations and also reported by patients on a monthly basis using the safety reporting questionnaire. The safety reporting questionnaires being used are study specific. The clinician AE reporting questionnaire is based on the TGA recommended guidelines for AE reporting which conform to WHO grading and causality definitions. [Patient reported data collected at baseline, and then monthly for a 12 month period post-enrolment. Clinician reported data collected at 3, 6, 9 and 12 months post-enrolment. ];Change to patient-reported concomitant medications (including opioid use) over the observational period using study-specific questionnaires. [Completed at baseline, and then monthly for 12 months post-enrolment. ] Study Design: Purpose: Natural history;Duration: Longitudinal;Selection: Defined population;Timing: Prospective

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A multiple protease strategy to optimise shotgun proteomics of medicinal cannabis mature buds.

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