Which of the following are known as helix breakers? O Proline Isoleucine leucine O Valine O Threonine O O O
Q: the amino acid histidine has three ionizable groups with pKa values of 1.8, 6.0, and 9.2. In a…
A: Using Henderson Hasslebach equation, pH=pKa+log [his] \[hisH+] 5.4=1.8+log[his] \[his H+]…
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Q: deoxynucleosides?
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Q: a peptide has the sequence: Asp-His-Tyr-Asn. What is the net charge on this molecule at pH 7.2?
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Q: Please explain the following terms: Chirality Enantiomer Stereoisomer Diastereomer
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Q: The beta-branched OH amino acid depicted below is: O OH NH₂ OL-L Isoleucine
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- A homopolymer of histidine (polyhistidine) adopts an alpha helix structure at pH 9 but isunfolded at a pH of 4. Explain why using chemical detailsGiven the polypeptide chain below: Ala-Arg-Val-His-Asp-Gln 1. What is the N-terminus? 2.What is the C-terminus?Polyglycine, a simple polypeptide, can form a helix with φ = -80°, ψ = +150°. From the Ramachandran plot (as shown), describe this helix with respect to handedness.
- Given the structures of the ribonucleotides and deoxyribonucleotides: Adenine Uracil Thymine HN Adenine NH HO-P-0- CH2 HO-P-0 CH2 HO-P-0-CH2 HO-P-0-CH он он он он OH H OH H Cytosine Cytosine Guanine Guanine NH2 NH NH2 CH2 HOo CH2 HO-P-0 -CH2 он он он он OH H OH H • Draw the structure of the polyribonucleotide UAGCCUG. Draw the structure of the polydeoxyribonucleotide CGTAGAT.A schematic diagram of the helical structure of cytochrome b562 is reproduced below. Thisprotein belongs to the family of -proteins that have a four-helix bundle. Number the helices 1 – 4according to their N C direction. Indicate relative orientations of the macrodipoles of helices 1 – 4adjacent to the diagram of cytochrome b562. Remember that according to the definition of a dipolethat the arrow points towards the positive end.Given the polypeptide chain below: Ala-Arg-Val-His-Asp-Gln 1. What kind of polypeptide is it? 2. How many peptide bonds are there?
- Figure 1 shows the structure of adenine and thymine. (i) (ii) NH adenine C-H thymine Figure 1 Illustrate the potential tautomers of adenine and thymine. Draw a chemical structure of Thyminc-Adenine (T-A) base pair and label the patterns of hydrogen bond acceptors, donors in the major groove of the TA base pair.List some of the possible combinations of α-helices and βsheets in supersecondary structures.Why proline encounters at the myoglobin and hemoglobin molecules where polypeptide chains turns a corner?
- A synthetic polypeptid made up of L-glutamic acid residues is in a random coil configuration at pH 7.0 but changes to alpha helical when the pH is lowered to 2.0. Explain this pH-dependent conformational transition.. Give two reasons to explain why a proline residue in the middle of an ahelix is predicted to be destabilizing to the helical structure1. Consider the following α helix from myoglobin at pH 7. Gln-Gly-Ala-Met-Asn-Lys-Ala-Leu-Glu-His-Phe-Arg-Lys-Asp-Ile-Ala-Ala-Lys-Tyr(a) Label amino acids in the polypeptide above as follows: p for polar and uncharged, np for non polar, – for negatively charged, and + for positively charged.(b) How many complete turns are there in this helix?(b) Which side chains are likely to be on the side of the helix that faces the aqueous solvent? Why?(c) Which side chains are likely to face the interior of the protein? Why?