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Amino acid analysis of a decapeptide revealed the presenceof:

Asp Glu Tyr Arg Met Pro Lys Ser Phe

The following facts were observed:

Carboxypeptidase A or B treatment of the decapeptide had anyeffect

Trypsin treatment yielded two tetrapeptides and free Lys

Clostripain treatment yielded a tetrapeptide and ahexapeptide.

Cyanogen bromide treatment yielded an octapeptide and adipeptide of sequence Asn and Pro.

Chymotripsin treatment yielded two tripeptides and atetrapeptide. The N terminal chymotryptic peptide had a charge of-1 at neutral pH and a net charge of -3 at pH=12.

One cycle of Edman degradation gave PTH-Ser.

What is the amino acid sequence?

Amino acid analysis of a decapeptide revealed the presenceof:

Asp Glu Tyr Arg Met Pro Lys Ser Phe

The following facts were observed:

Carboxypeptidase A or B treatment of the decapeptide had anyeffect

Trypsin treatment yielded two tetrapeptides and free Lys

Clostripain treatment yielded a tetrapeptide and ahexapeptide.

Cyanogen bromide treatment yielded an octapeptide and adipeptide of sequence Asn and Pro.

Chymotripsin treatment yielded two tripeptides and atetrapeptide. The N terminal chymotryptic peptide had a charge of-1 at neutral pH and a net charge of -3 at pH=12.

One cycle of Edman degradation gave PTH-Ser.

What is the amino acid sequence?

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Bunny Greenfelder
Bunny GreenfelderLv2
28 Sep 2019
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