workshop structural proteomics of biological complexes
DESCRIPTION
Workshop Structural Proteomics of Biological Complexes. Questions. Why is it timely to study complexes ? What are the most appropriate model organisms ? How to predict relevant complexes ? How to purify complexes ? How to validate their biological functions ? - PowerPoint PPT PresentationTRANSCRIPT
Workshop
Structural Proteomics of Biological Complexes
Questions
Why is it timely to study complexes ?What are the most appropriate model organisms ?How to predict relevant complexes ?How to purify complexes ?How to validate their biological functions ?What are the necessary technologies ?What are the realistic goals and timetables ?What are the necessary resources to accomplish the goals ?What are the funding mechanisms for such an initiative ?
Workshop Agenda
Session I Cell Biology and Complexes Session II Biological Processes and Protein Machines Session III Genetic and Chemical Approaches Session IV Computational ApproachesSession V Electron Cryomicroscopy Session VI Crystallography Session VII Proteomics Centers Session VIII Recommendations
Electron Cryomicroscopy: A Structural Biology Tool
Instrument resolution beyond 2.2 Å
• Single machines: 9 – 6.8 Å helices and ß sheets visualized
Structural Features Revealed by Electron Cryomicroscopy
• Crystalline arrays : 3.7-3.0 Å polypeptide traced
• Helical arrays: 9 - 4.0 Å helices and ß strands resolved
• Subcellular assemblies and whole cell: 50 - 15 Å
identify components and domains
• Single machines: 9 – 6.8 Å helices and ß sheets visualized
• Single machines: 9 – 6.8 Å helices and ß sheets visualized
GroEL
D Chen
9 Å Structure of GroEL
S Ludtke
9 Å Structure of GroEL
6.8 Å Structure of Rice Dwarf Virus
Zhou et al. Nature SB (2001) 8:868-73
Rice Dwarf Virus Outer Shell Protein P8
1
3
2
4
69
7
Pseudo Atomic Model of RDV
Images of P22 Phage
500Å500Å
Procapsid Mature phage
Structural Transitions in Phage Maturation
Jiang et al (2003) Nature SB 10:131-5
Issues in CryoEM for Studying Single Particles of Complexes
• High structural purityChemical vs computational
• High resolutionNow 7-9 ÅFuture 3-4 Å
• High throughput analysisNow 5-10 monthsFuture 1- few weeks
Experimental and Computational Processes
• Biochemical Purification• Cryo-Specimen Preparation• Data Collection• Data Digitization• Pre-processing• Initial Model• Structure Refinement• Structure Visualization• Structure Analysis
• Biochemical Purification• Cryo-Specimen Preparation• Data Collection• Data Digitization• Pre-processing• Initial Model• Structure Refinement• Structure Visualization• Structure Analysis
• ManpowerChemists or
BiochemistsPhysicists or EngineersComputational
Scientists
• New InstrumentationEMCCD CameraFreezing Apparatus
• High Performance Computers
Resources Needed