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Passage Antimicrobial Peptides Are an Important Component of Innate Immunity.  Since

Question 290

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Passage
Antimicrobial peptides are an important component of innate immunity.  Since their discovery in 1939, over 5,000 peptides with antimicrobial properties have been isolated from organisms in every domain of life.  They have demonstrated activity against enveloped viruses, bacteria, fungi, and even tumor cells and have recently gained interest for their potential in fighting antibiotic-resistant bacteria.  Most known antimicrobial peptides are positively charged, but some with negative charges have also been discovered.Frogs are known to secrete a variety of antimicrobial peptides as a major source of immunity.  Secretions from a new species of frog were collected and the peptides were separated by cation exchange chromatography.  Four of the isolated peptides demonstrated strong antibacterial activity and were characterized by isoelectric focusing and sequencing:
Passage Antimicrobial peptides are an important component of innate immunity.  Since their discovery in 1939, over 5,000 peptides with antimicrobial properties have been isolated from organisms in every domain of life.  They have demonstrated activity against enveloped viruses, bacteria, fungi, and even tumor cells and have recently gained interest for their potential in fighting antibiotic-resistant bacteria.  Most known antimicrobial peptides are positively charged, but some with negative charges have also been discovered.Frogs are known to secrete a variety of antimicrobial peptides as a major source of immunity.  Secretions from a new species of frog were collected and the peptides were separated by cation exchange chromatography.  Four of the isolated peptides demonstrated strong antibacterial activity and were characterized by isoelectric focusing and sequencing: <strong>Figure 1</strong>  Results of isoelectric focusing of four antimicrobial peptides<strong>Table 1</strong>  Amino Acid Compositions of Four Antimicrobial Peptides Adapted from Wang Z, Wang G. APD: the Antimicrobial Peptide Database. Nucleic Acids Res. 2004;32(Database issue) :D590-2. -Which amino acid residue is most likely responsible for the decreased isoelectric point of Peptide 2 relative to Peptide 3? A) Threonine B) Histidine C) Aspartate D) Glutamate Figure 1  Results of isoelectric focusing of four antimicrobial peptidesTable 1  Amino Acid Compositions of Four Antimicrobial Peptides
Passage Antimicrobial peptides are an important component of innate immunity.  Since their discovery in 1939, over 5,000 peptides with antimicrobial properties have been isolated from organisms in every domain of life.  They have demonstrated activity against enveloped viruses, bacteria, fungi, and even tumor cells and have recently gained interest for their potential in fighting antibiotic-resistant bacteria.  Most known antimicrobial peptides are positively charged, but some with negative charges have also been discovered.Frogs are known to secrete a variety of antimicrobial peptides as a major source of immunity.  Secretions from a new species of frog were collected and the peptides were separated by cation exchange chromatography.  Four of the isolated peptides demonstrated strong antibacterial activity and were characterized by isoelectric focusing and sequencing: <strong>Figure 1</strong>  Results of isoelectric focusing of four antimicrobial peptides<strong>Table 1</strong>  Amino Acid Compositions of Four Antimicrobial Peptides Adapted from Wang Z, Wang G. APD: the Antimicrobial Peptide Database. Nucleic Acids Res. 2004;32(Database issue) :D590-2. -Which amino acid residue is most likely responsible for the decreased isoelectric point of Peptide 2 relative to Peptide 3? A) Threonine B) Histidine C) Aspartate D) Glutamate Adapted from Wang Z, Wang G. APD: the Antimicrobial Peptide Database. Nucleic Acids Res. 2004;32(Database issue) :D590-2.
-Which amino acid residue is most likely responsible for the decreased isoelectric point of Peptide 2 relative to Peptide 3?


A) Threonine
B) Histidine
C) Aspartate
D) Glutamate

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