Guangju Chen

Learn More
Molecular dynamics (MD) simulations for Zif268 (a zinc-finger-protein binding specifically to the GC-rich DNA)-d(A(1) G(2) C(3) G(4) T(5) G(6) G(7) G(8) C(9) A(10) C(11) )(2) and TATA(ZF) (a zinc-finger-protein recognizing the AT-rich DNA)-d(A(1) C(2) G(3) C(4) T(5) A(6) T(7) A(8) A(9) A(10) A(11) G(12) G(13) )(2) complexes have been performed for(More)
The Mad2 protein, with two distinct conformations of open- and closed-states, is a key player in the spindle checkpoint. The closed Mad2 state is more active than the open one. We carried out conventional and targeted molecular dynamics simulations for the two stable Mad2 states and their conformational transition to address the dynamical transition(More)
Antifreeze proteins (AFPs) help many organisms protect themselves from freezing in subzero temperatures. The most active AFPs found to date are those from insects, which possess exceptionally regular beta-helical structures. On the ice-binding surface of these proteins, regularly arrayed water molecules are observed within the repeating Thr-Xxx-Thr motif,(More)
Because of their remarkable ability to depress the freezing point of aqueous solutions, antifreeze proteins (AFPs) play a critical role in helping many organisms survive subzero temperatures. The beta-helical insect AFP structures solved to date, consisting of multiple repeating circular loops or coils, are perhaps the most regular protein structures(More)
WW domains harbor substrates containing proline-rich motifs, but the substrate specificity and binding mechanism remain elusive for those WW domains less amenable for structural studies, such as human WWP2 (hWWP2). Herein we have employed multiple techniques to investigate the second WW domain (WW2) in hWWP2. Our results show that hWWP2 is a specialized E3(More)
Escherichia coli tyrosine kinase (Etk) regulates the export of pathogenic capsular polysaccharide (CPS) by intermolecularly autophosphorylating its C-terminal tyrosine cluster. The kinase Etk, however, needs to be first activated by the intramolecular phosphorylation of a tyrosine residue, Y574, next to the active site. The recently determined structure of(More)
We used steered molecular dynamics (SMD) to simulate the process of Ca(2+) dissociation from the EF-hand motifs of the C-terminal lobe of calmodulin. Based on an analysis of the pulling forces, the dissociation sequences and the structural changes, we show that the Ca(2+)-coordinating residues lose their binding to Ca(2+) in a stepwise fashion. The two(More)
The DNA binding and cross-linking modes of a trinuclear platinum complex [Pt(3)Cl(3)(hptab)][ClO(4)](3) (1; hptab = N,N,N',N',N'',N''-hexakis(2-pyridylmethyl)-1,3,5-tris(aminomethyl)benzene) and its dinuclear analogue [Pt(2)Cl(2)(m-tpxa)]Cl(2) (2; m-tpxa = N,N,N',N'-tetra(2-pyridylmethyl)-m-xylylene diamine) are reported and compared. The adducts of 1 and 2(More)
Neural Network (NN) ensemble approach has been an appealing topic in the field of analog circuit fault diagnosis lately. In this paper, a new method for fault diagnosis of analog circuits with tolerance based on NN ensemble method with cross-validation is proposed. Firstly, bias-variance decomposition shows the theoretical guide on how to choose the(More)