Proteomics

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Endogenous S-nitrosoproteome in colorectal cancer patients


ABSTRACT: Total lysate of tumorous and adjacent normal tissues from each colorectal cancer patient are followed by S-alkylating biotin switch strategy. All biotinylated peptides are analyzed by label-free quantitation and LC-MS/MS analysis. All peak lists from 66 raw MS/MS spectra were processed to mgf format by Mascot Distiller v2.1.1.0. The datasets were batch-searched and combined searched by Mascor v2.2 against the Swissprot v 57.8 human database. PEO-iodoacetyl-biotin (C, +414 Da), Caebamidomethyl (C) and oxidation (M) were specified as variable modifications. Peptides were considered to be identified if the Mascot individual ion score was higher than the Mascot identity score (p less than 0.05). To evaluate the false discovery rate in protein identification, a decoy database search against a randomized decoy database created by Mascot using identical search parameters and validation criteria were also performed. The search results in Mascot were exported in eXtensive Markup Language (XML) data format.

INSTRUMENT(S): Q-Tof Premier

ORGANISM(S): Homo Sapiens (human)

SUBMITTER: Yi-Ju Chen  

PROVIDER: PXD000467 | Pride | 2014-08-20

REPOSITORIES: Pride

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Publications

Decoding the s-nitrosoproteomic atlas in individualized human colorectal cancer tissues using a label-free quantitation strategy.

Chen Yi-Ju YJ   Ching Wei-Chieh WC   Chen Jinn-Shiun JS   Lee Tzong-Yi TY   Lu Cheng-Tsung CT   Chou Hsiao-Chiao HC   Lin Pei-Yi PY   Khoo Kay-Hooi KH   Chen Jenn-Han JH   Chen Yu-Ju YJ  

Journal of proteome research 20140804 11


The abnormal S-nitrosylation induced by the overexpression and activation of inducible nitric oxide synthase (iNOS) modulates many human diseases, such as inflammation and cancer. To delineate the pathophysiological S-nitrosoproteome in cancer patients, we report an individualized S-nitrosoproteomic strategy with a label-free method for the site-specific quantification of S-nitrosylation in paired tumor and adjacent normal tissues from 11 patients with colorectal cancer (CRC). This study provide  ...[more]

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