part iii - bioinformatics study of aminoacyl trna ...€¦ · the cutaway view at right shows that...
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Part III - Bioinformatics Study of Aminoacyl tRNA Synthetases
VMD Multiseq Tutorial Web tools
Perth, Australia 2004 Computational Biology Workshop
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Multiple Sequence Alignments
• “The aminoacyl-tRNA synthetases, perhapsbetter than any other molecules in the cell,eptiomize the current situation and help tounder standard (the effects) of HGT” Woese(PNAS, 2000; MMBR 2000)
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The Universal Phylogenetic Tree inferred from comparative analyses of rRNA sequences: Woese(PNAS, 1990)
Universal Tree
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Horizontal Gene Transfer
O’Donoghue and Luthey-Schulten, MMBR, 2004
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Standard Dogma Molecular Biology
• DNA RNA Proteins
• Role of AARS?
• Charging of t-RNAanticodon loop
acceptor stem tRNA
anticodonacceptorstemtRNAPhe
www.rpi.edu/dept/bcbp/molbiochem/MBWeb/mb2/part1/25-trna.ppt
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Charging the tRNA
Woese, Olsen (UIUC), Ibba (Panum Inst.), Soll (Yale) Micro. Mol. Biol. Rev. March 2000..
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Aminoacyl-tRNA Synthetases catalyze linkage of theappropriate amino acid to each tRNA. The reaction occurs intwo steps.In step 1, an O atom of the amino acid α-carboxyl attacks theP atom of the initial phosphate of ATP.
OOHOHHHHCH2HOPOPOP−OOO−O−OOO−RHCCNH3+O−OOOHOHHHHCH2HOPOCOO−HCRNH2OAdenineAdenine
ATP Amino acid
Aminoacyl-AMP
1
+ PPi
www.rpi.edu/dept/bcbp/molbiochem/MBWeb/mb2/part1/25-trna.ppt
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In step 2, the2' or 3' OH ofthe terminaladenosine oftRNA attacksthe amino acidcarbonyl Catom.
OOHOHHHHCH2HOPOCOO−HCRNH2OAdenineOOHOHHHCH2HOPOOO−AdeninetRNACHCONH3+RtRNAAMP
Aminoacyl-AMP
Aminoacyl-tRNA
(terminal 3’nucleotide of appropriate tRNA)
3’ 2’
2
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Aminoacyl-tRNA Synthetase
Summary of the 2-step reaction:1. amino acid + ATP aminoacyl-AMP + PPi
2. aminoacyl-AMP + tRNA aminoacyl-tRNA + AMP
Overall Reaction:amino acid + ATP + tRNA aminoacyl-tRNA + AMP + PPi
Next step: EF and Ribosome for Protein Synthesis
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Structure of the E. coli Ribosome
The cutaway view at right shows positions of tRNA (P, Esites) & mRNA (as orange beads).Figure: Laboratory of Joachim Frank, Wadsworth Centercryo-EM and 3D image reconstruction
small subunitlarge subunitmRNAlocationEF-GtRNA
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The cutaway view at right shows that the tunnel in theyeast large ribosome subunit, through which nascentpolypeptides emerge from the ribosome, lines up with thelumen of the ER Sec61 channel.Figure provided by Joachim Frank, whose lab carried out thecryo-EM & image reconstruction on which these images are based.
small subunit large
subunit
Sec61 channel
path of nascent protein
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Step 1: Explore active site in catalytic domain and anticodon domain.
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Sequence PhylogenyAspRS-AsnRS Group
Db
N
Da
De
bacterial insertions
archaealhelix
archaeal helix extension
Horizontal Gene Transfer in Protein Structure
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Structure PhylogenyClass II AARSs
Structure PhylogenyClass I AARSs
O’Donoghue and Luthey-Schulten, MMBR 2004
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Structure PhylogenyClass II AARSs
Structure PhylogenyClass I AARSs
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Multiseq extension in VMD
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Conservation
Core Structure Conserved Sequence Identity of Core Less than 15%
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Useful Web Tools
• SCOP - Structure Database• NCBI Genomes – Sequence and Gene Information• SWISSPROT - Sequence Database• PFAM Domain Architecture• Clustal Multiple Sequence Alignments• Hidden Markov Methods• Phylip Phylogenetic Trees• Matlab - Statistics UPGMA
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Scop (Astral Database)
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NCBI: Genomes
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NCBI 3D
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Report from SWISS-PROT
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PFAM Report
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Sequence UPGMA Dendrogram - Clustal
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Phylogenetic (UPGMA) Tree -Matlab
Pogorelov and Luthey-Schulten, UIUC 2003
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Bioinformatics of Aquaporin Tutorial Week II Perth
Highlights:
• Structural overlap• Correlation conserved residues and mechanism
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Towards Understanding Membrane ChannelsThe versaltile, highly selective and efficent aquaporin
GlpF Structure (Stroud et al)NAMD with full electrostaticsPeriodic boundary conditionsNpT ensemble at 310 K1ns equilibrationProtein: ~ 15,000 atomsLipids: ~ 40,000 atomsWater: ~ 51,000 atomsTotal: ~ 106,000 atoms4 hrs / ns – 1024 TSC CPUs
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The Aquaporin Superfamily
Watertransport
Glyceroltransport
Heymann and Engel News Physiol. Sci. 14, 187 (1999)
(Animal)
(Animal)
(Bacterial)
(Bacterial)
(Bacterial)
(Bacterial)
(Bacterial)
(Plant)
(Yeast)
(Yeast)
(Yeast)
(Plant)
(Plant)
(Animal)
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Structure and Sequence Comparisons
Water/Glycerol Channels
2 AQP1, GLPF, AQPZfrom animal and bacteria
GLPF Sequence Conservation
Top view
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Acknowledgements - Tutorials
Seq Alignment• Rommie Amaro• Felix Autenrieth• Brijeet Dhaliwal• Barry Isralewitz• Taras Pogorelov• Anurag Sethi
Evolution AARS•Rommie Amaro•PatrickO’Donoghue•Brijeet Dhaliwa
BioinformaticsAquaporins•Fatemeh Araghi•Brijeet Dhaliwal•Elizabeth Villa
VMD Developers: Dan Wright, John Eargle, John Stone