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Ultraviolet photodissociation at 266 nm of phosphorylated peptide cations
Park, Soojin,Ahn, Wha-Keun,Lee, Sunyoung,Han, Sang Yun,Rhee, Bum Ku,Oh, Han Bin John Wiley Sons, Ltd. 2009 Rapid communications in mass spectrometry Vol.23 No.23
<P>Ultraviolet (UV) photodissociation (PD) experiments using 266 nm light were performed for a series of phosphopeptide cations in a Fourier transform mass spectrometer. The objective of the experiments was to determine whether 266 nm UV irradiation on the phosphopeptide cations would induce unique peptide backbone dissociation. In addition, the general behavior of the phosphate loss (−80 or −98 Da) was monitored, particularly for those phosphopeptides with a phosphotyrosine residue that itself is a UV chromophore. For phosphopeptides with a UV chromophore, their photodissociation behavior was very similar to that of low-energy sustained off-resonance irradiation collisionally activated dissociation (SORI-CAD), with a few exceptions. For example, b- and y-type peptide backbone fragments were prevalent, and their dephosphorylation behavior was consistent with that of the SORI-CAD results. For phosphoserine peptides, the loss of a phosphate group was always observed. On the other hand, for phosphotyrosine peptides, the phosphate loss was found to be dependent on the presence of a basic amino group in the sequence and the charge state of the precursor ions, in agreement with the CAD results in the literature. However, hydrogen atom loss or aromatic side chain loss, which is known to be the excited state specific fragmentation pathway, was rarely observed in our 266 nm UV PD experiments, in contrast to the previous UV PD literature (particularly at 220 nm). The mechanism for these observations is described in terms of dominant internal conversion followed by intramolecular vibrational energy redistribution (IVR). Copyright © 2009 John Wiley & Sons, Ltd.</P>
흰쥐의 뇌조직에서 Protease Inhibitor Nexin - 1 과 N - Methylpurine - DNA Glycosylase 유전자 발현연구
김남근(Nam Keun Kim),황태선(Tae Sun Hwang),김남일(Nam Il Kim),강원석(Won Suk Kang),안정용(Jung Yong Ahn),오도연(Do Yeun Oh),황성규(Seong Gyu Hwang),김병성(Byung Sung Kim),고정재(Jung Jae Ko),(Ki Wha Chung) 한국유전학회 2001 Genes & Genomics Vol.23 No.4
Protease nexin-1(PN-1) is a potent thrombin inhibitor that is identical to the glia-derived neurite promoting factor or glia-derived nexin. It also plays a role in regulating proteolytic activity of plasminogen activator(PA) system. PN-1 is known to be involved in tissue remodeling, cellular invasiveness, matrix degradation and tumor growth. The multifunctional mammalian N-methylpurine-DNA glycosylase(MPG) is responsible for the DNA repair of alkylating damages. In this study, we examined regional differences of PN-1 and MPG transcript in the adult rat brain. Results show a widespread but heterogeneous patterns of expression. These analyses revealed distinct spatial PN-1 and MPG expression patterns in thalamus, olfactory bulb, midbrain, cerebellum, hippocampus, basal ganglia, septal area, spinal cord, pons, cerebral cortex, pituitary gland and medulla oblongata. Interestingly, PN-1 and MPG expressions were found in all tested brain regions with about two-fold differences(p>0.05). The differential regulation of PN-1 and MPG expression across different regions of the rat brain suggests multiple roles in tissue homeostasis and DNA damages.
Han Bin Oh,Sun Young Lee,Soojin Park,Yewon Lee,강혁,Ki-Ho Cho,Wha-Keun Ahn,이범구 대한화학회 2008 Bulletin of the Korean Chemical Society Vol.29 No.9
It was demonstrated that ECD MS can be successfully applied to Bovine ubiquitin (8.6 kDa, 76 amino acids) and Pseudomonas aeruginosa azurin (13.9 kDa, 128 amino acids, 1 disulfide bond) cations using photoelectrons emitted by irradiating a 266 nm UV laser light on the edge of an ion cyclotron resonance (ICR) cell trapping plate hole. The photoelectron ECD method cleaved protein backbone bonds as effectively as conventional ECD MS methods that employed a tungsten (W) wire or heated dispenser cathode as an electron source. This method offers the advantage of providing electrons for ECD MS without an apparent electron source. Key Words : 266 nm UV laser, Electron capture dissociation (ECD), Ubiquitin, Azurin, FTICR MS
김경수,이창우,김성윤,이중달,김목현,김태화,안정경,이정균 대한내과학회 1988 대한내과학회지 Vol.34 No.2
We describe a patient presented with livedo reticularis, episodic fits, recurrent orogenital ulcer and who was found to have metastatic emboli to the skin from left atrial myxoma. The myxomatous emboli in peripheral arterioles of the biopsied skin were demonstrated. Two demensional echocardiography further established the presence of left atrial myxoma. Our case illustrates the fact that myxomatous emboli to the skin may cause livedo reticularis.