KP Ramirez Week 2
Allele Protein Structures
- Met non polar, hydrophobic. Ser polar uncharged. Asn polar uncharged. Arg polar uncharged. His Polar uncharged. Ile Nonpolar hydrophobic. Leu Nonpolar hydrophobic. Val Nonpolar hydrophobic. TYR polar uncharged. TRP nonpolar hydrophobic. Arg polar uncharged. Gln polar uncharged.
TYR-polar uncharged, CYS-polar uncharged
TRP-Nonpolar hydrophobic, CYS-polar uncharged
PHE-nonpolar hydrophobic CYS-Polar uncharged
Val-Nonpolar hydrophobic, CYS polar uncharged.
- Green green/green
- Green2 Blue/Yellow
- Red: Red/nothing
- White: White/White
Phenotypes & Genotypes
- Red -CrCr
- Blue -CbCb
- Orange-Needs yellow and red CrCy
- Purple -Needs Red and blue CrCb
- Black -Needs red and green CrCg
Charged, acidic (-) basic (+) form ionic bonds Uncharged polar form H-bonds Hydrophobic(nonpolar) hydrophobic interaction, van der waals
There are positions that are important, look at the characteristics of amino acid side chains. Figure out how to make the purple flowers, look at the properties and make an educated guess
- Question 1: What are the differences in the amino acid sequences of the proteins produced by the alleles you define in Part I? Hint: use the Compare menu to find the difference(s)between the amino acid sequences.
- This occurs for the amino acid sequence found at position 10 and 11
Green:Met-Ser-Asn-Arg-His-Ile-Leu-Leu-Val-Tyr-Trp-Arg-Gln Blue:Met-Ser-Asn-Arg-His-Ile-Leu-Leu-Val-Tyr-Cys-Arg-Gln Yellow:Met-Ser-Asn-Arg-His-Ile-Leu-Leu-Val-Trp-Cys-Arg-Gln Red:Met-Ser-Asn-Arg-His-Ile-Leu-Leu-Val-Phe-Cys-Arg-Gln White:Met-Ser-Asn-Arg-His-Ile-Leu-Leu-Val-Val-Cys-Arg-Gln
- Question 2: What features of the amino acid sequence make a protein pigmented?
- The amino acid side chains cause protein pigmentation as well as the structure. This in turn presents how light is reflected and perceived.
- Question 3: What features of the amino acid sequence make a protein a particular color?
- The differences in color between different proteins depends upon a protein's amino acid sequences as explained above. The particular pigment which is reflected by a given protein will likely be determined by the interaction between the aromaticity in the amino acid side chains.
- Question 4:How do the colors combine to produce an overall color? How does this explain the genotype-phenotype rules you found in part (I)?
Because we are working under the assumption that the two proteins (allele colors) found in a diploid organism work alone as monomers rather than dimers, each protein will be reflecting and absorbing its own specific wavelength of light. When two proteins of different colors are found in a diploid organism, either one color allele will be observed in the organism or a different, new color allele will be observed.
The following genotype/phenotypes were observed:
- Green 1: green/green
- Green 2: blue/yellow
- Green 3: green/yellow
- Green 4: green/blue
- Green 5: green/white
- Red: red
- Red 1: white/red
- White: white/white
- Black: green/red
- Purple: blue/red
- Orange: yellow/red
- Blue: blue/white
- Yellow: yellow/white
Because an observed color of white indicates that all color is absorbed and non is reflected, it makes sense that a white allele would become "hidden" and therefore not observed when combined with an allele of another color. In situations where two color alleles are combined, such as with blue/red, yellow/red, and blue/yellow, genetic co-dominance is observed in which the combination of two proteins which reflect and absorb different wavelengths of light cause a new color appearing as a "blend" of the two alleles to be observed. The green allele, when combined with all other color alleles except red, exhibits a genetic dominance. ASK
- Question 5: Which proteins are found in each of the four starting organisms?
- Question 6: Using this knowledge, construct a purple protein.
Met Ser Asn Arg His Ile Leu Leu Val Tyr Phe Cys Arg Gln
Met Ser Asn Arg His Ile Leu Leu Val Tyr Phe Arg Gln
Our group worked together to determine what would be the best way to go about finding a purple flower. The protein is purple because of the way in which Tyr and Phe this order was imperative. reflect and absorb light. Because both amino acids have aromatic side chains with alternating double and single bond ring structures, they reflect and absorb different wavelengths of light. Because the presence of Tyr tends to reflect blue light, as seen in the table below with the blue protein allele, and the presence of Phe tends to reflect red light, as seen in the table below with the red protein allele. Combined these two produced the purple pigment.
- Note: the following was the initial table completed in the computer lab, however, Janelle was able to provide a more detailed one seen below. Table of Color/Amino Acid Sequence
Met Ser Asn Arg His Ile Leu Leu Val Val Cys Arg Gln
Met Ser Asn Arg His Ile Leu Leu Val Phe Tyr Arg Gln
Met Ser Asn Arg His Ile Leu Leu Val Cys Cys Arg Gln
Met Ser Asn Arg His Ile Leu Leu Val Tyr Tyr Arg Gln
Met Ser Asn Arg His Ile Leu Leu Val Trp Tyr Arg Gln
When you add amino acids with non-aromatic side chains to these positions (10 and 11), you get a white protein. Also, though Phe and Tyr, which are amino acids with aromatic side chains, will yeild a purple protein when at postions 10 and 11, respectively, when you SWITCH Phe and Tyr, you get a white protein. Just Tyr (aromatic) and you get a white protein.
Met Ser Asn Arg His Ile Leu Leu Val Phe Trp Arg Gln
Met Ser Asn Arg His Ile Leu Leu Val Trp Phe Arg Gln
Met Ser Asn Arg His Ile Leu Leu Val Trp Phe Phe Arg Gln
Met Ser Asn Arg His Ile Leu Leu Val Phe Phe Arg Gln
Lots of Phe at those positions gives a red protein.
Met Ser Asn Arg His Ile Leu Leu Val Tyr Phe Trp Arg Gln
Met Ser Asn Arg His Ile Leu Leu Val Trp Tyr Phe Arg Gln
Met Ser Asn Arg His Ile Leu Leu Val Phe Tyr Trp Arg Gln
Having all three amino acids in any combination at between positions 9 and 12 yeilds a black protein.
Met Ser Asn Arg His Ile Leu Leu Val Trp Trp Arg Gln
Met Ser Asn Arg His Ile Leu Leu Val Trp Cys Arg Gln
If many Trps are added to these positions, get a yellow protein.
Lots of Tyr (aromatic) at these positions, and you get a blue protein.
It doesn’t seem to matter when you add non-aroamtic to the mix…. Stays the same color
Met Ser Asn Arg His Ile Leu Leu Val Tyr Trp Arg Gln
If you add a few more Tyr or Trp to these positions, get a green protein. If you switch Trp and Tyr, you get a white protein.
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