Science Forums Biology Forum Molecular Biology Forum Physics Chemistry Forum

Science Forums Biology Forum Molecular Biology Forum Physics Chemistry Forum (http://www.molecularstation.com/forum/)
-   Peptide Forum (http://www.molecularstation.com/forum/peptide-forum/)
-   -   How to draw the structural formula to amino acid peptide? (http://www.molecularstation.com/forum/peptide-forum/84341-how-draw-structural-formula-amino-acid-peptide.html)

Crowe 12-19-2011 10:18 PM

How to draw the structural formula to amino acid peptide?
 
I'm confused by what my microbiology teacher wants me to do with the following problem:
"Consider the following peptide:
lysine-valine-threonine-
cysteine-leucine-proline-
gluamine-glutamic acid-aspartic acid-tryptophan, with lysine as the amino-terminal acid and tryptophan as the carboxy-terminal amino acid in the peptide.

Draw out the complete structural formula of the peptide and determine the overall ionic charge on the peptide at pH 7.0. Charge at acid pHs? Charge at alkaline pHs?"

Can someone help me figure out how to draw this structure and figure out the ionic charges?

Kunal Pandya 12-20-2011 08:57 AM

Re: How to draw the structural formula to amino acid peptide?
 
1 Attachment(s)
Ionic charge at acidic pH 2~3

Lys-Val-Thr-Cys-Leu-Pro-Gln-Glu-Asp-Trp
+2 + 0 + 0 + 0 + 0 + 0 + 0 +0 + 0 (-1) = + 1

Ionic charge at acidic pH 5~6

Lys-Val-Thr-Cys-Leu-Pro-Gln-Glu-Asp-Trp
+2 + 0 + 0 + 0 + 0 + 0 + 0+(-1)+(-1)+(-1) = -1

Ionic charge at neutral pH 7

Lys-Val-Thr-Cys-Leu-Pro-Gln-Glu-Asp-Trp
+2 + 0 + 0 + 0 + 0 + 0 + 0+(-1)+(-1)+(-1) = -1
Ionic charge at basic pH 12

Lys-Val-Thr-Cys-Leu-Pro-Gln-Glu-Asp-Trp
0 + 0 + 0+(-1)+ 0 + 0 + 0 +(-1)+(-1)+(-1) = -4

Regards
Kunal Pandya


All times are GMT. The time now is 11:41 PM.

Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright 2005 - 2012 Molecular Station | All Rights Reserved

Page generated in 0.08985 seconds with 11 queries