Abstract

This project focuses on a number of structural determinants responsible for regulating the assembly properties of the actin cytoskeleton and the in vivo consequences of these activities. One of the principle features of actin filament assembly that is not currently understood is the mechanism by which ATP hydrolysis effects actin polymerization. At X9B, we have now obtained high resolution data of Mg-ATP yeast actin and both the Mg-ATP and Mg-ADP forms of Dictyostelium actin. The yeast structure refined at 1.9E clearly shows the adenine nucleotide and the octahedral coordination of the magnesium ion, as well as a water molecule positioned to act as the attacking nucleophile. Furthermore, an extensive network of water molecules is revealed in the large cleft of the actin monomer that might be important in modulating the conformational rearrangements that occur upon filament elongation. These structures will for the first time allow for actin catalyzed ATP hydrolysis to be treated a true enzymatic reaction.

  Funding Agency

Agency
National Institute of Health (NIH)
Institute
National Center for Research Resources (NCRR)
Type
Biotechnology Resource Grants (P41)
Project #
2P41RR001633-16
Application #
6120405
Study Section
Project Start
1998-09-30
Project End
1999-08-31
Budget Start
Budget End
Support Year
16
Fiscal Year
1998
Total Cost
Indirect Cost

  Institution

Name
Albert Einstein College of Medicine
Department
Type
DUNS #
009095365
City
Bronx
State
NY
Country
United States
Zip Code
10461

  Publications

Vongsvivut, Jitraporn; Fernandez, Jason; Ekgasit, Sanong et al. (2004) Characterization of supported cylinder-planar germanium waveguide sensors with synchrotron infrared radiation. Appl Spectrosc 58:143-51
Masip, Lluis; Pan, Jonathan L; Haldar, Suranjana et al. (2004) An engineered pathway for the formation of protein disulfide bonds. Science 303:1185-9
Huang, Raymond Y; Miller, Lisa M; Carlson, Cathy S et al. (2003) In situ chemistry of osteoporosis revealed by synchrotron infrared microspectroscopy. Bone 33:514-21
Rashidzadeh, Hassan; Khrapunov, Sergei; Chance, Mark R et al. (2003) Solution structure and interdomain interactions of the Saccharomyces cerevisiae ""TATA binding protein"" (TBP) probed by radiolytic protein footprinting. Biochemistry 42:3655-65
Uchida, Takeshi; Takamoto, Keiji; He, Qin et al. (2003) Multiple monovalent ion-dependent pathways for the folding of the L-21 Tetrahymena thermophila ribozyme. J Mol Biol 328:463-78
Taylor, Colleen M; Watton, Stephen P; Bryngelson, Peter A et al. (2003) Inner-sphere complexation of cobalt(II) 2,9-dimethyl-1,10-phenanthroline ([Co(neo)]2+) with commercial and sol-gel derived silica gel surfaces. Inorg Chem 42:312-20
Chance, Mark R; Bresnick, Anne R; Burley, Stephen K et al. (2002) Structural genomics: a pipeline for providing structures for the biologist. Protein Sci 11:723-38
Maleknia, Simin D; Kiselar, Janna G; Downard, Kevin M (2002) Hydroxyl radical probe of the surface of lysozyme by synchrotron radiolysis and mass spectrometry. Rapid Commun Mass Spectrom 16:53-61
Marinkovic, N S; Huang, R; Bromberg, P et al. (2002) Center for Synchrotron Biosciences' U2B beamline: an international resource for biological infrared spectroscopy. J Synchrotron Radiat 9:189-97
Huang, R Y; Miller, L M; Carlson, C S et al. (2002) Characterization of bone mineral composition in the proximal tibia of cynomolgus monkeys: effect of ovariectomy and nandrolone decanoate treatment. Bone 30:492-7

Showing the most recent 10 out of 68 publications