Hallo alle zusammen. Wie siehts aus will jemand Ergebnisse für die gestellten Fragen vergleichen und diskutieren?
Ich mach dann mal den Anfang :
Exercise 1 Database searches:
1) Use a web-browser to retrieve a protein sequence of lambda repressor from SWISS-PROT (
http://us.expasy.org/sprot). Search for the words "lambda repressor" in the protein knowledge base (UniProtKB). Note the number of hits and write down what kind of information is available for the entries.
120 hits, Information: Namen, Herkunft, Proteineigenschaften,Ontologies, Sequence annotation, Sequence and References , Cross References Entry information2)In the same database, search for more sequences using the keywords, "human catalase". How many entries do you find? Are these all really human catalases? Why, or why not? Find out how to limit the search to catalases in human.
6 hits3)Go to the SRS server (
http://srs6.ebi.ac.uk/) and find human genes that are larger than 200 kilobase pairs and also have a poly-A signal. Click on the "Library Page" button. Select "EMBL" in the "Nucleotide sequence databases" section. Choose the "Extended" query form on the left of the page. In the following page, select human ("hum") at the "Division" section. Enter "200000" in the "SeqLength >=" field. Enter "polya_signal" in the "AllText" field. Press the "Search" button. How many hits do you get? Write down the sequence of the Poly-A signal of three entries.
96 hits4) Use your knowledge and creativity to do the following SRS exercises
Find protein sequences from Rhizobium submitted by Ausubel between 1991 and 2001 in the Uniprot/Swiss-Prot database. Write down the entry names.
Find full-length protein sequences of mammalian tyrosine phosphatase in the UniProt/Swiss-Prot database. (hint: the taxonic group of mammals is mammalia; use '! segmented' to restrict to full-length sequences). Write down the number of hits and the names of the different species you found.
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5) Go to the web page of NCBI Entrez (
http://www.ncbi.nlm.nih.gov/gquery) and use the advanced search options to find protein sequences for human kinase modified or added in the last 30 days in GenBank. In the Entrez website, go to the "Protein" database, enter "human[ORGN] kinase" and then select "30 days" in the "Modification in the last" field of the "Limits" section. Select "GenBank" as source database. Write down the number of hits. Do you think this is a large number? Explain!
114 hits6) Using Entrez, search DNA sequences for mouse fas antigen with annotated exons or introns. (Do not forget to deselect "Limits" from the above exercise) In Entrez, select the Nucleotide database. Type "mouse[ORGN] AND fas AND (exons OR introns)". Click "Go". Write down the number of entries that you found.
10 hitsso irgendwelche Kommentare?