6. Poly-L-glutamate can form -helical structure, but only below pH 2. Explain.
6. Poly-L-glutamate can form -helical structure, but only below pH 2. Explain.
Homework Answers
The α-helix is a right-handed helix with the peptide bonds located on the inside and the side chains extending outward. It is stabilized by the regular formation of hydrogen bonds parallel to the axis of the helix; they are formed between the amino and carboxyl groups of every fourth peptide bond. Glutamic acid has an extra carboxylic group in its side chain. so it is called acidic amino acid. At lowPh (below 2) all the carboxylic side groups remain protonated form and thus they form hydrogen bond which is necessary for alpha helix formation.
Add Answer to:
6. Poly-L-glutamate can form -helical structure, but only below
pH 2. Explain.
Draw the predominant form for glutamate in a solution with each pH listed below. Draw the...
Draw the predominant form for glutamate in a solution with each pH listed below. Draw the mooecule including charges where needed, do not draw a fischer projection. pH=0 pH=3 pH=6 pH=11
Explain in detail: Why does DNA form a double-helical structure?
Explain in detail: Why does DNA form a double-helical structure?
(2%) Indicate which secondary structure or structures (α -helix, β -pleated, random coil) will the following...
(2%) Indicate which secondary structure or structures (α -helix,
β -pleated, random coil) will the following peptide adopt in an
aqueous solution at pH 7
(2%) The unfolding of the alpha helix of a polypeptide to a
randomly coiled conformation is accompanied by a large decrease in
a property called specific rotation, a measure of
a solution’s capacity to rotate circularly polarized light.
Polyglutamate, a polypeptide made up of only L-Glu residues, has
the alpha helical
conformation at pH 3....
1. Explain why polyaspartatic acid (a peptide containing only aspartic acid residues) does NOT form an...
1. Explain why polyaspartatic acid (a peptide containing only aspartic acid residues) does NOT form an alpha helix at pH 7.0 but can at pH 2. 6. 2. What kind of non-covalent interaction would the following pairs of amino acids have in the three dimensional structure of a protein at pH 7.0? a) His-Asp b) Tyr-Asp c) Val-Leu d) Trp-Gln 3. Explain how the difference in structure of hemoglobin and myoglobin contribute to their different functions.
a) Draw helical wheels for each of the following two sequences. 1) E-L-K-D-L-S-K-S 2) L-R-K-L-E-R-S-L b....
a) Draw helical wheels for each of the following two sequences. 1) E-L-K-D-L-S-K-S 2) L-R-K-L-E-R-S-L b. In the diagram above show likely interactions between each sequence. C What is the name of the secondary structure this may form
one sequence contains E-L-K-D-L-S-K-S and the other contains L-R-K-L-E-R-S-L. please draw helical wheels and identify the...
one sequence contains E-L-K-D-L-S-K-S and the other contains L-R-K-L-E-R-S-L. please draw helical wheels and identify the interactions between the 2 wheels. What secondary structure does this form?
Draw the structure of the predominant form of CH3CH2NH3+ (pKa = 11.0) at pH = 6.
Draw the structure of the predominant form of CH3CH2NH3+ (pKa = 11.0) at pH = 6.
please draw and explain quetion 7 and explain Question 8 Question 7 The structure shown below...
please draw and explain quetion 7 and explain Question 8
Question 7 The structure shown below corresponds to: NH 0/1 point 1) keto tautomeric form of cytosine 2) enol tautomeric form of cytosine 3) imino tautomeric form of uracil 4) imino tautomeric form of cytosine Question 8 1/1 point For the oligoribonucleotide CGTAAGCCG (bearing a phosphate group at the 5' end and an OH group at the 3' end), the net charge at physiological pH i.e. pH = 7.4) is:...
1a. Explain how bacteria can have poly cistronic mRNAs. 1b. Explain why eukaryotes don't have poly...
1a. Explain how bacteria can have poly cistronic mRNAs. 1b. Explain why eukaryotes don't have poly cistronic mRNAs. 2. Draw all the parts of a typical sliced out mRNA lariat, showing the donor (gu) and acceptor (ag) nucleotides, and the conserved branch point A. Indicate any unusual base pair linkages and explain where and what they are (arrows and a few words!). 3. Give the levels of B-galactosidase activity (+ or -) expected for the following partial diploids for the...
1. (a) Draw the structure of L-glutamic acid and show its one letter and three letter...
1. (a) Draw the structure of L-glutamic acid and show its one letter and three letter code. (1 pt) (b) Show the calculation for its isoelectric point. (HINT: Check the pKa of the R group also.) (2 pt) (c) Draw the forms of glutamic acid at pH 1, 6 and 10. (3 pt) (d) To which electrode would glutamic acid migrate in electrophoresis at pH 7 buffer, the anode (+) or cathode (-)? (1 pt) (e) MSG (monosodium glutamate) is...
(2%) Indicate which secondary structure or structures (α -helix,
β -pleated, random coil) will the following peptide adopt in an
aqueous solution at pH 7
(2%) The unfolding of the alpha helix of a polypeptide to a
randomly coiled conformation is accompanied by a large decrease in
a property called specific rotation, a measure of
a solution’s capacity to rotate circularly polarized light.
Polyglutamate, a polypeptide made up of only L-Glu residues, has
the alpha helical
conformation at pH 3....
a) Draw helical wheels for each of the following two sequences. 1) E-L-K-D-L-S-K-S 2) L-R-K-L-E-R-S-L b. In the diagram above show likely interactions between each sequence. C What is the name of the secondary structure this may form
please draw and explain quetion 7 and explain Question 8
Question 7 The structure shown below corresponds to: NH 0/1 point 1) keto tautomeric form of cytosine 2) enol tautomeric form of cytosine 3) imino tautomeric form of uracil 4) imino tautomeric form of cytosine Question 8 1/1 point For the oligoribonucleotide CGTAAGCCG (bearing a phosphate group at the 5' end and an OH group at the 3' end), the net charge at physiological pH i.e. pH = 7.4) is:...
1a. Explain how bacteria can have poly cistronic mRNAs. 1b. Explain why eukaryotes don't have poly cistronic mRNAs. 2. Draw all the parts of a typical sliced out mRNA lariat, showing the donor (gu) and acceptor (ag) nucleotides, and the conserved branch point A. Indicate any unusual base pair linkages and explain where and what they are (arrows and a few words!). 3. Give the levels of B-galactosidase activity (+ or -) expected for the following partial diploids for the...
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