Dataset Information

Intensity-based absolute quantification (iBAQ) of proteins in MDA-MB231

ABSTRACT: To determine the absolute copy number of proteins in MDA-MB231 breast cancer cells, we employed IBAQ mediated absolute quantification of proteins based on (Schwanhäusser et al., Nature, 2011), with some modifications. Maqquant calculated iBAQ values were calibrated using spike-in standards, and used to calculate copy numbers for each identified protein within the dataset. Copy numbers for a total of 3,584 proteins were calculated in MDA-MB231 cells.

INSTRUMENT(S): Q Exactive Plus

ORGANISM(S): Homo Sapiens (human)

TISSUE(S): Permanent Cell Line Cell, Cell Culture

DISEASE(S): Breast Cancer

SUBMITTER: Faraz Mardakheh

LAB HEAD: Faraz K. Mardakheh

PROVIDER: PXD024139 | Pride | 2021-05-14

REPOSITORIES: Pride

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Publications

A prometastatic splicing program regulated by SNRPA1 interactions with structured RNA elements.

Fish Lisa L Khoroshkin Matvei M Navickas Albertas A Garcia Kristle K Culbertson Bruce B Hänisch Benjamin B Zhang Steven S Nguyen Hoang C B HCB Soto Larisa M LM Dermit Maria M Mardakheh Faraz K FK Molina Henrik H Alarcón Claudio C Najafabadi Hamed S HS Goodarzi Hani H

Science (New York, N.Y.) 20210501 6543

Aberrant alternative splicing is a hallmark of cancer, yet the underlying regulatory programs that control this process remain largely unknown. Here, we report a systematic effort to decipher the RNA structural code that shapes pathological splicing during breast cancer metastasis. We discovered a previously unknown structural splicing enhancer that is enriched near cassette exons with increased inclusion in highly metastatic cells. We show that the spliceosomal protein small nuclear ribonucleop ...[more]

PMID: 33986153

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Project description:Aiming at defining the protein content and composition of a single mitochondrion of Arabidopsis thaliana, shotgun analyses were performed on purified mitochondria from cultured heterotrophic Arabidopsis cells. Based on microscopic observations on the size of mitochondria, as well as biochemical properties, such as protein concentration, average molecular mass of proteins, and the average length of the signal peptide, intensity-based absolute quantification (iBAQ) values were applied to calculate the copy number of each identified protein species within a single mitochondrion. Copy numbers of the individual proteins span five orders of magnitude, ranging from >40,000 for Voltage-Dependent Anion Channel 1 (VDAC1) to sub-stoichiometric copy numbers, i.e. less than a single copy per single mitochondrion, for several pentatricopeptide repeat (PPR) proteins that modify mitochondrial transcripts. Aiming at defining the protein content and composition of a single mitochondrion of Arabidopsis thaliana, shotgun analyses were performed on purified mitochondria from cultured heterotrophic Arabidopsis cells. Based on microscopic observations on the size of mitochondria, as well as biochemical properties, such as protein concentration, average molecular mass of proteins, and the average length of the signal peptide, intensity-based absolute quantification (iBAQ) values were applied to calculate the copy number of each identified protein species within a single mitochondrion. Copy numbers of the individual proteins span five orders of magnitude, ranging from >40,000 for Voltage-Dependent Anion Channel 1 (VDAC1) to sub-stoichiometric copy numbers, i.e. less than a single copy per single mitochondrion, for several pentatricopeptide repeat (PPR) proteins that modify mitochondrial transcripts. Aiming at defining the protein content and composition of a single mitochondrion of Arabidopsis thaliana, shotgun analyses were performed on purified mitochondria from cultured heterotrophic Arabidopsis cells. Based on microscopic observations on the size of mitochondria, as well as biochemical properties, such as protein concentration, average molecular mass of proteins, and the average length of the signal peptide, intensity-based absolute quantification (iBAQ) values were applied to calculate the copy number of each identified protein species within a single mitochondrion. Copy numbers of the individual proteins span five orders of magnitude, ranging from >40,000 for Voltage-Dependent Anion Channel 1 (VDAC1) to sub-stoichiometric copy numbers, i.e. less than a single copy per single mitochondrion, for several pentatricopeptide repeat (PPR) proteins that modify mitochondrial transcripts.

Dataset Information

Intensity-based absolute quantification (iBAQ) of proteins in MDA-MB231

Publications

A prometastatic splicing program regulated by SNRPA1 interactions with structured RNA elements.

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