Dataset Information

MALDI-TOF Profiling of modified histone proteins

ABSTRACT: Histone lysine methylations as one of the chromatin post-translational modifications, has been linked to the modification of chromatin regions and mediating genome functions.In this study, we investigated the divergent role for histone H4 lysine 20 mono-methylation (H4K20me1) in facilitates chromatin openness and accessibility by disrupting chromatin folding.

INSTRUMENT(S): 5800 TOF/TOF

ORGANISM(S): Homo Sapiens (human)

SUBMITTER: Qinming Chen

LAB HEAD: Lars Nordenskiold

PROVIDER: PXD027150 | Pride | 2021-08-26

REPOSITORIES: Pride

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Publications

Histone H4 lysine 20 mono-methylation directly facilitates chromatin openness and promotes transcription of housekeeping genes.

Shoaib Muhammad M Chen Qinming Q Shi Xiangyan X Nair Nidhi N Prasanna Chinmayi C Yang Renliang R Walter David D Frederiksen Klaus S KS Einarsson Hjorleifur H Svensson J Peter JP Liu Chuan Fa CF Ekwall Karl K Lerdrup Mads M Nordenskiöld Lars L Sørensen Claus S CS

Nature communications 20210820 1

Histone lysine methylations have primarily been linked to selective recruitment of reader or effector proteins that subsequently modify chromatin regions and mediate genome functions. Here, we describe a divergent role for histone H4 lysine 20 mono-methylation (H4K20me1) and demonstrate that it directly facilitates chromatin openness and accessibility by disrupting chromatin folding. Thus, accumulation of H4K20me1 demarcates highly accessible chromatin at genes, and this is maintained throughout ...[more]

PMID: 34417450

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Project description:Background: Respiratory allergy triggered by pollen allergens is increasing at an alarming rate worldwide. Sunflower pollen is thought to be an important source of inhalant allergens. Present study aims to identify the prevalence of sunflower pollinosis among the Indian allergic population and characterizes the pollen allergens using immuno-proteomic tools. Methodology: Clinico-immunological tests were performed to understand the prevalence of sensitivity towards sunflower pollen among the atopic population. Sera from selected sunflower positive patients were used as probe to detect the IgE-reactive proteins from the one and two dimensionally separated proteome of sunflower pollen. The antigenic nature of the sugar moiety of the glycoprotein allergens was studied by meta-periodate modification of IgE-immunoblot. Finally, these allergens were identified by mass-spectrometry (MALDI TOF/TOF and LC ESI qTOF). MASCOT searching was performed against NCBInr database. However, Helianthus annuus genome is not fully sequenced and partially annotated. So in case of low confidence (p> 0.05) protein identification, searching was performed against EST library of Helianthus annuus. Results: Prevalence of sunflower pollen allergy was observed among 21% of the atopic population and associated with elevated level of specific IgE and histamine in the sera of these patients. Immunoscreening of sunflower pollen proteome with patient serum detected seven IgE-reactive proteins with varying molecular weight and pI. Hierarchical clustering of 2D-immunoblot data highlighted three allergens characterized by a more frequent immuno-reactivity and increased levels of IgE antibodies in the sera of susceptible patients. These allergens were considered as the major allergens of sunflower pollen and were found to have their glycan moiety critical for inducing IgE response. Homology driven search of MS/MS data of these IgE-reactive proteins identified seven previously unreported allergens from sunflower pollen. Three major allergenic proteins were identified as two non-isoformic pectate lyases and a cystein protease. Conclusion: Novelty of the present report is the identification of a panel of seven sunflower pollen allergens for the first time at immuno-biochemical and proteomic level, which substantiated the clinical evidence of sunflower allergy. Further purification and recombinant expression of these allergens will improve component-resolved diagnosis and therapy of pollen allergy.

			Action	DRS
	H4K20me0.t2d	Other
	H4K20me0.tif	Other
	H4K20me0.txt	Txt
	H4K20me3.t2d	Other
	H4K20me3.tif	Other