scholarly journals MALDI-ISD Mass Spectrometry Analysis of Hemoglobin Variants: a Top-Down Approach to the Characterization of Hemoglobinopathies

2015 ◽  
Vol 26 (8) ◽  
pp. 1299-1310 ◽  
Author(s):  
Roger Théberge ◽  
Sergei Dikler ◽  
Christian Heckendorf ◽  
David H. K. Chui ◽  
Catherine E. Costello ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Mass Spectrometry Analysis ◽  
Top Down ◽  
Spectrometry Analysis ◽  
Hemoglobin Variants

Mass spectrometry analysis of redox forms of High-Mobility Group Box-1 Protein in cerebrospinal fluid: initial experience.

2019 ◽  
Vol 88 (3) ◽  
pp. 171-176
Author(s):  
Agata Światły ◽  
Norbert Wąsik ◽  
Joanna Hajduk ◽  
Eliza Matuszewska ◽  
Paweł Dereziński ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Cerebrospinal Fluid ◽  
Subarachnoid Hemorrhage ◽  
High Mobility ◽  
High Mobility Group ◽  
Mass Spectrometry Analysis ◽  
Aneurysmal Subarachnoid Haemorrhage ◽  
Top Down ◽  
Spectrometry Analysis ◽  
Redox Forms

Introduction. High-mobility group box 1 (HMGB1) is an alarmin with proinflammatory potential determined by redox status of the cysteines at position 23 and 45. It may also play a role as a biomarker in biological fluids. The aim of this study was the identification of different HMGB1 redox forms in cerebrospinal fluid (CSF) obtained from subarachnoid hemorrhage patients. Material and Methods. 6 CSF samples were collected from aneurysmal subarachnoid haemorrhage patients. Commercially available HMGB1 isoforms served as a positive control. Immunoprecipitation and electrophoretic isolation of HMGB1 protein were performed, then both CSF and control were analyzed using mass spectrometry technique. To distinguish between fully reduced (thiol group at C23 and C45) and disulfide (disulfide bond connecting C23 and C45) HMGB1 forms, top-down sequencing of the spectra was performed. Results. Top-down sequencing analysis allowed to distinguish between HMGB1 isoforms only in commercially available standard without preceding immunoprecipitation and electrophoresis. MALDI spectra differ i.e. on the fully reduced HMGB1 spectrum fragmentation occurs before and beyond C22, which is not present on the disulfide HMGB1 spectrum. Analysis of HMGB1 isolated from CSF obtained from subarachnoid hemorrhage patients gave no results. Conclusions. Top-down sequencing enables to distinguish between redox forms of HMGB1. Electrophoresis and tryptic digestion cannot precede mass spectrometry analysis of redox forms of HMGB1 due to the reduction of disulfide bonds during these processes. Preferred method of isolation of HMGB1 for direct analysis using top-down sequencing mustn’t include protein digestion or degradation.

Pulse laser-induced fragmentation of carbon quantum dots: a structural analysis

Nanoscale ◽  
2017 ◽  
Vol 9 (46) ◽  
pp. 18359-18367 ◽  
Author(s):  
Han-Wei Chu ◽  
Ju-Yi Mao ◽  
Chia-Wen Lien ◽  
Pang-Hung Hsu ◽  
Yu-Jia Li ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Quantum Dots ◽  
Pulse Laser ◽  
Carbon Quantum Dots ◽  
Mass Spectrometry Analysis ◽  
Surface Functional Groups ◽  
Heteroatom Doping ◽  
Spectrometry Analysis ◽  
Carbon Core

Mass spectrometry analysis of pulse laser-induced fragmentation of carbon quantum dots allows characterization of the surface functional groups and carbon core with various heteroatom doping.

scholarly journals Enterobacter cancerogenus produces short chain N-3-oxo-acylhomoserine lactones quorum sensing molecules

2015 ◽  
Author(s):  
Kok-Gan Chan ◽  
Wen-Si Tan
Keyword(s):  
Mass Spectrometry ◽  
Liquid Chromatography ◽  
High Resolution ◽  
Quorum Sensing ◽  
Homoserine Lactone ◽  
Mass Spectrometry Analysis ◽  
Liquid Chromatography Mass Spectrometry ◽  
Spectrometry Analysis ◽  
Synthesis Activity

Enterobacter cancerogenus strain M004 genome size is 5.67 Mb. Here, its luxI homologue, designated as ecnI which is ecnI gene (633 bp) was cloned and overexpressed. Its AHL synthesis activity was verified using the high-resolution liquid chromatography-mass spectrometry analysis revealed the production of N-(3-oxo-hexanoyl)-L-homoserine lactone (3-oxo-C6-HSL) and N-(3-oxo-hexanoyl)-L-homoserine lactone (3-oxo-C8-HSL). The cloning and characterization of luxI homologue of E. cancerogenus strain M004 was firstly reported here.

Sign in / Sign up

Export Citation Format

Share Document