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CORPORATE GOVERNANCE AND STOCK MARKET DURATION FOR SOUTH KOREA AND THE USA
Dan B. Hemmings,Jill F. Solomon The Institute of East and West Studies 1998 Global economic review Vol.27 No.3
In this paper we investigate the hypothesis that international differences in corporate governance systems may be portrayed through measuring the duration of stock markets. Stock market duration provides a means of measuring the average length of time for which investors retain their investment in a country's equity assets. We expect that countries classified as insider-dominated are likely to be characterised by longer stock market durations whereas outsiders-dominated economies will have shorter stock market durations. By estimating the stock market duration of South Korea and the USA, we test our hypothesis and find that the USA, an outsiders-dominated economy has a significantly shorter stock market duration than South Korea, an insider-dominated economy.
Park, Jongsun,Feng, Jianhua,Li, Yuwen,Hammarsten, Ola,Brazil, Derek P,Hemmings, Brian A American Society for Biochemistry and Molecular Bi 2009 The Journal of biological chemistry Vol.284 No.10
<P>DNA-dependent protein kinase (DNA-PK) has been implicated in a variety of nuclear processes including DNA double strand break repair, V(D)J recombination, and transcription. A recent study showed that DNA-PK is responsible for Ser-473 phosphorylation in the hydrophobic motif of protein kinase B (PKB/Akt) in genotoxic-stressed cells, suggesting a novel role for DNA-PK in cell signaling. Here, we report that DNA-PK activity toward PKB peptides is impaired in DNA-PK knock-out mouse embryonic fibroblast cells when compared with wild type. In addition, human glioblastoma cells expressing a mutant form of DNA-PK (M059J) displayed a lower DNA-PK activity when compared with glioblastoma cells expressing wild-type DNA-PK (M059K) when PKB peptide substrates were tested. DNA-PK preferentially phosphorylated PKB on Ser-473 when compared with its known in vitro substrate, p53. A consensus hydrophobic amino acid surrounding the Ser-473 phospho-acceptor site in PKB containing amino acids Phe at position +1 and +4 and Tyr at position -1 are critical for DNA-PK activity. Thus, these data define the specificity of DNA-PK action as a Ser-473 kinase for PKB in DNA repair signaling.</P>
Poster Session : Coordinated activation of PDK1 by tyrosine phosphorylation
( Keum Jin Yang ),( Sang Hee Shin ),( Long Zhen Piao ),( Eul Soon Shin ),( Kyung Ah Park ),( Hee Sun Byun ),( Min Ho Won ),( Gang Min Hur ),( Jeong Ho Seok ),( Brian A Hemmings ),( Jong Sun Park ) 한국생화학분자생물학회 (구 한국생화학회) 2006 생화학분자생물학회 춘계학술발표논문집 Vol.2006 No.-