lesson 4: using bioinformatics to analyze protein sequences powerpoint slides to accompany using...
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LESSON 4: Using Bioinformatics to Analyze Protein Sequences
PowerPoint slides to accompany
Using Bioinformatics: Genetic Research
Biological AnthropologistMichael Crawford, PhD
Place of Employment:
University of Kansas
Type of Work:
DNA analysis to study the history of human
population and migrations
Science was something that I was always excited about. I have one foot in anthropology as an anthropological geneticist; therefore I’m not strictly limited to a laboratory, but can go into the field for my work reconstructing the history of human populations and their origins based on population genetics.
DNA is Complementary and Anti-Parallel
5’- CCGATGTCATAAGAC - 3’
Gene or coding strand
DNA is Complementary and Anti-Parallel
5’- CCGATGTCATAAGAC - 3’3’- GGCTACAGTATTCTG - 5’
Gene or coding strand
Template or non-coding strand
Translating DNA into Proteins
5’- CCGATGTCATAAGAC - 3’
Gene or coding strand
3’- GGCTACAGTATTCTG - 5’Template or non-coding strand
Translating DNA into Proteins
5’- CCGATGTCATAAGAC - 3’
Gene or coding strand
3’- GGCTACAGTATTCTG - 5’Template or non-coding strand
5’- CCGAUGUCAUAAGAC - 3’mRNA
3’- - 5’tRNAs GGC UAC AGU AUU CUG
How Do We Know Where to Start Translation?
5’- CCGATGTCATAAGAC - 3’
Gene or coding strand
3’- GGCTACAGTATTCTG - 5’Template or non-coding strand
5’- CCGAUGUCAUAAGAC - 3’mRNA
3’- - 5’tRNAs GGC UAC AGU AUU CUG
The Codon Table
Valine (Val / V)
Alanine(Ala / A)
Aspartic Acid
(Asp / D)
Glutamic Acid
(Glu / E)
Glycine (Gly / G)
Arginine(Arg / R)
Serine(Ser / S)
Lysine(Lys / K)
Asparagine (Asn / N)
Threonine (Thr / T)
Methionine (Met/ M)
Isoleucine (Ile/ I)
Phenyl-alanine (Phe / F)
Leucine(Leu / L)
Serine(Ser / S)
Tyrosine (Tyr / Y)
STOP
Cysteine (Cys / C)
STOP
Leucine (Leu / L)
Proline(Pro / P)
Histidine(His / H)
Glutamine (Gln / Q)
Arginine (Arg / R)
Tryptophan (Trp / W)
Amino Acid Side Chains and Chemistry
O
H2N CH C OH
R
Amino Acid Backbone:
Amino Acid Side Chain (R-Group):
Valine (Val / V)
Alanine(Ala / A)
Aspartic Acid
(Asp / D)
Glutamic Acid
(Glu / E)
Glycine (Gly / G)
Arginine(Arg / R)
Serine(Ser / S)
Lysine(Lys / K)
Asparagine (Asn / N)
Threonine (Thr / T)
Methionine (Met/ M)
Isoleucine (Ile/ I)
Phenyl-alanine (Phe / F)
Leucine(Leu / L)
Serine(Ser / S)
Tyrosine (Tyr / Y)
STOP
Cysteine (Cys / C)
STOP
Leucine (Leu / L)
Proline(Pro / P)
Histidine(His / H)
Glutamine (Gln / Q)
Arginine (Arg / R)
Tryptophan (Trp / W)
Step 1
Step 2
Step 3
Step 4
DNA is Complementary and Anti-Parallel
5’- CCGATGTCATAAGAC - 3’3’- GGCTACAGTATTCTG - 5’
Gene or coding strand
Template or non-coding strand
DNA is Complementary and Anti-Parallel
5’- CCGATGTCATAAGAC - 3’3’- GGCTACAGTATTCTG - 5’
Gene or coding strand
Template or non-coding strand
What are Reading Frames?
“Gene” Sequence: thecatatetherat.
Reading Frame +1 starts at the first letter:the cat ate the rat.
Reading Frame +2 starts at the second letter: t hec ata tet her at.
Reading Frame +3 starts at the third letter: th eca tat eth era t.
Reading Frames -1, -2 & -3 would be like reading the sentence “backwards.”
The period at the end of the sentence is like a stop codon.
Open Reading Frame: the cat ate the rat.
How Do We Know Where to Start Translation?
5’- CCGATGTCATAAGAC - 3’3’- GGCTACAGTATTCTG - 5’
Reading Frame +1
How Do We Know Where to Start Translation?
5’- CCGATGTCATAAGAC - 3’3’- GGCTACAGTATTCTG - 5’
Reading Frame +1 P M S STOP
5’- CCGATGTCATAAGAC - 3’
How Do We Know Where to Start Translation?
5’- CCGATGTCATAAGAC - 3’3’- GGCTACAGTATTCTG - 5’
Reading Frame +1 P M S STOP
Reading Frame +2 R C H K
5’- CCGATGTCATAAGAC - 3’
How Do We Know Where to Start Translation?
5’- CCGATGTCATAAGAC - 3’3’- GGCTACAGTATTCTG - 5’
Reading Frame +1 P M S STOP
Reading Frame +2 R C H K
Reading Frame -1 R H STOP L V
Biological AnthropologistMichael Crawford, PhD
Place of Employment:
University of Kansas
Type of Work:
DNA analysis to study the history of human
population and migrations
Science was something that I was always excited about. I have one foot in anthropology as an anthropological geneticist; therefore I’m not strictly limited to a laboratory, but can go into the field for my work reconstructing the history of human populations and their origins based on population genetics.
CAREERS IN SPOTLIGHT:
Biological Anthropologist
What do they do?Also called Physical Anthropologists, Biological Anthropologists study the development of the human species in the context of other primates and fossils.
They:
• compare and contrast traits among species
• study why and when certain traits evolved or disappeared
What kind of training is involved?Bachelor’s or Master’s degree to work in the field. PhD to run your own lab.
What is a typical salary for a Biological Anthropologist?Bachelor’s Degree: $35,000 to $40,000 ($17.50–$19.00/hour) PhD, Full Professor: up to $150,000/year ($72.00/hour)
Source: Bureau of Labor and Statistics