Useful links

Sequence Searching (Primary databases)
BLAST http://www.ncbi.nlm.nih.gov/blast/ Sequence database search at the NCBI
FASTA http://www.ebi.ac.uk/fasta33/ FASTA sequence database search
Motif Searching (Secondary databases)
InterPro http://www.ebi.ac.uk/interpro Integrated resource of secondary databases
PRINTS http://umber.sbs.man.ac.uk/dbbrowser/fingerPRINTScan/ PRINTS secondary database
BLOCKS http://blocks.fhcrc.org/blocks_search.html BLOCKS secondary database
ProSite http://www.ebi.ac.uk/ppsearch/ ProSite secondary database
Pfam http://www.sanger.ac.uk/Software/Pfam/search.shtml Pfam secondary database
MOTIF http://motif.genome.jp/ Integrated motif searching resource
DNA to Protein Translation
Expasy http://www.expasy.ch/tools/dna.html 6-frame translation software
Secondary Structure Prediction
JPRED http://www.compbio.dundee.ac.uk/~www-jpred/ Secondary structure prediction
GOR-III http://npsa-pbil.ibcp.fr/cgi-bin/npsa_automat.pl?page=npsa_gib.html GOR-III SS Prediction
GOR-IV http://npsa-pbil.ibcp.fr/cgi-bin/npsa_automat.pl?page=npsa_gor4.html GOR-IV SS Prediction
GOR-V http://gor.bb.iastate.edu/ GOR-V SS Prediction
PSIPred http://www.psipred.net/ PSIPred SS Prediction - probably the best!
Transmembrane Prediction
TSEG http://www.genome.ad.jp/tools/tseg/ Predict membrane proteins
TMHMM-2.0 http://www.cbs.dtu.dk/services/TMHMM-2.0/ TM prediction through Hidden Markov Models
TopPred http://bioweb.pasteur.fr/seqanal/interfaces/toppred.html Predict location and orientation of transmembrane helices through an advanced use of hydrophobicity patterns, and by applying the 'positive-inside' rule
DAS http://www.sbc.su.se/~miklos/DAS/ TM Prediction through an advanced use of hydrophobicity patterns
MemSat http://www.psipred.net/ MemSat TM prediction (on the same page as PsiPred)
Post-translational Modification Prediction
NetPhos http://www.cbs.dtu.dk/services/NetPhos/ NetPhos is a neural network-based method for predicting potential phosphorylation sites at serine, threonine or tyrosine residues in protein sequences.
NetOGlyc http://www.cbs.dtu.dk/services/NetOGlyc/ The NetOglyc WWW server produces neural network predictions of mucin type GalNAc O-glycosylation sites in mammalian proteins.
big-PI http://mendel.imp.univie.ac.at/gpi/gpi_server.html GPI Modification Site Prediction
Threading and Fold Recognition
SAM-T06 http://www.soe.ucsc.edu/research/compbio/SAM_T06/T06-query.html An HMM based method to find remote homologs.
phyre http://www.sbg.bio.ic.ac.uk/~phyre/ Fold recognition (Protein Homology/analogY Recognition Engine)
GenThreader http://www.psipred.net/ Fast threading - on the same site as PSIPred
Comparative Modelling Servers
Swiss-Model http://www.expasy.ch/swissmod/SWISS-MODEL.html An Automated Protein Modelling Server running at the GlaxoWellcome Experimental Research in Geneva, Switzerland
CPHmodels http://www.cbs.dtu.dk/services/CPHmodels/ A neural net based comparative modelling tool
CYSPRED http://gpcr.biocomp.unibo.it/cgi/predictors/cyspred/pred_cyspredcgi.cgi Disulphide prediction
Sequence Alignment
ClustalW http://www.ebi.ac.uk/clustalw/ Multiple sequence alignment at the EBI.
ClustalW http://www.ch.embnet.org/software/ClustalW.html
Sequence-based Profiles
ProtScale http://www.expasy.ch/cgi-bin/protscale.pl Plot various sequence-based profiles (hydrophobicity, secondary structure, etc.)
Signal-Peptide Prediction
PSORT http://psort.ims.u-tokyo.ac.jp/ Predict protein sorting signals
SignalP http://www.cbs.dtu.dk/services/SignalP/ Signal peptides
Integrated Prediction Systems
PredictProtein http://www.predictprotein.org Prediction system from Columbia University (also available at The EBI) Includes PHD secondary structure prediction, ProSite, domain prediction, threading, solvent accessibility, TM, etc.

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