Chapter 24: Q28P. (page 1297)
Draw the complete structure of the following peptide Met-Ser-Gln-
Short Answer
Complete structure of the peptide
Chapter 24: Q28P. (page 1297)
Draw the complete structure of the following peptide Met-Ser-Gln-
Complete structure of the peptide
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Get started for freeDraw three-dimensional representation of the following amino acids:
(a) L-alanine
(b) L-Leucine
(c) D-serine
(d) D-glutamine
After treatment with peroxyformic acid, the peptide hormone vasopressin is partially hydrolyzed. The following fragments are recovered. Propose a structure for vasopressin.
Phe-Gln-Asn Pro-Arg-Gly.NH2 Cys-Tyr-Phe
Asn-Cys-Pro-Arg Tyr-Phe-Gln-Asn
A molecular weight determination has shown that an unknown peptide is a pentapeptide, and an amino acid analysis shows that it contains the following residues: one Gly, two Ala, one Met, one Phe. Treatment of the original pentapeptide with carboxypeptidase gives alanine as the first free amino acid released. Sequential treatment of the pentapeptide with phenyl isothiocyanate followed by mild hydrolysis gives the following derivatives:
Propose a structure for the unknown pentapeptide.
Show how you would use a Strecker synthesis to make
Answer
Draw the resonance forms of a protonated guanidino group and explain why arginine has such a strongly basic isoelectric point.
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