The reason for use of alpha helices in the membrane-spanning for the G-protein-coupled receptors needs to be explained. Concept Introduction : The structure of alpha-helix is a polypeptide chain like a coiled rod giving a spring like structure. These polypeptide chains are bonded together with hydrogen bonds. The beta strands are responsible for bonding in beta-pleated sheets where they linked in lateral manner with hydrogen bonds resulting formation of a backbone. The number of amino acids involved in beta strand or chain formation is from 3-10.

Question

9) Below, there is a representation of an SDS-PAGE gel. Assuming the samples in the MW standard have masses of: 66 kDa, 45 kDa, 36 kDa, 29 kDa, 24 kDa, 20.1 kDa, and 14.2 kDa, a) Figure 4: indicate where each of the measurements were taken and label as in II.6. figure 2 above. b) As in II.7. Table 1 above create Table 2 using the data below. Determine the r.f. values for the MW standards, plot the relative mobility versus the log of the mass for the standards, and use the best fit straight line to determine the molecular weights of the proteins in the whey, peak 1, and peak 2 lanes. (5 pts—this will be scaled up appropriately if your gel did not develop properly) dye MW Whey Peak 1 Peak 2

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Chapter 32, Problem 11P

Interpretation Introduction

Interpretation:

The reason for use of alpha helices in the membrane-spanning for the G-protein-coupled receptors needs to be explained.

Concept Introduction :

The structure of alpha-helix is a polypeptide chain like a coiled rod giving a spring like structure. These polypeptide chains are bonded together with hydrogen bonds. The beta strands are responsible for bonding in beta-pleated sheets where they linked in lateral manner with hydrogen bonds resulting formation of a backbone. The number of amino acids involved in beta strand or chain formation is from 3-10.

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