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Amino Acids & Protein Structure

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L amino acid.

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L-cysteine

L-cysteine - ball and stick model

L-cysteine - ball and stick model

L-cysteine - space filling model

L-cysteine - space filling model

Cystine, showing disulfide bond

Cystine, showing disulfide bond

Glutathione.

L-glutamic acid

L-glutamic acid

L-glutamic acid - stick model

L-glutamic acid - stick model

L-glutamine

L-glutamine - stick model

L-glutamine - stick model

Glycine

Glycine - ball and stick model

Glycine - ball and stick model

Glycine - space filling model

Glycine - space filling model

Amino acid glycinate.

Amino acid glycinate.

IMC CC Noncommercial

L-histidine

L-histidine - stick model

L-histidine - stick model

Resonance in histidine

Resonance in histidine

Decarboxylation of histidine by histi...

Decarboxylation of histidine by histi...

The histidine bound heme group of suc...

The histidine bound heme group of suc...

L-isoleucine

L-isoleucine - stick model

L-isoleucine - stick model

L-leucine

L-leucine - stick model

L-leucine - stick model

L-lysine

L-lysine - stick model

L-lysine - stick model

L-lysine - zwitterion

L-lysine - zwitterion

L-methionine

L-methionine - stick model

L-methionine - stick model

Methionine biosynthesis

Methionine biosynthesis

L-phenylalanine

L-phenylalanine

L-phenylalanine - stick model

L-phenylalanine - stick model

Biosynthesis of phenylalanine. Prephe...

Biosynthesis of phenylalanine. Prephe...

L-phenylalanine can also be converted...

L-phenylalanine can also be converted...

L-proline

L-proline - stick model

L-proline - stick model

L-serine

L-serine - stick model

L-serine - stick model

L-threonine

L-threonine - stick model

L-threonine - stick model

Threonine biosynthesis

Threonine biosynthesis

L-tryptophan

L-tryptophan - stick model

L-tryptophan - stick model

Tryptophan biosynthesis

Tryptophan biosynthesis

Metabolism of L-tryptophan into serot...

Metabolism of L-tryptophan into serot...

L-tyrosine

L-tyrosine - stick model

L-tyrosine - stick model

Phe to Tyr conversion

Phe to Tyr conversion

Absorbance and fluorescence of tyrosi...

Absorbance and fluorescence of tyrosi...

Biosynthesis of tyrosine. Prephenate ...

Biosynthesis of tyrosine. Prephenate ...

L-valine

L-valine - stick model

L-valine - stick model

Two amino acids

Two amino acids

Bond angles for ? and ?

Bond angles for ? and ?

Dehydration synthesis (condensation) ...

Dehydration synthesis (condensation) ...

Donating an H-bond to the amide hydro...

Donating an H-bond to the amide hydro...

lectronegative substituent near the a...

lectronegative substituent near the a...

Cis-trans isomerization of an X-Pro p...

Cis-trans isomerization of an X-Pro p...

The condensation of two amino acids t...

The condensation of two amino acids t...

Protein folding

Protein folding

The purpose of the added reagents in ...

The purpose of the added reagents in ...

3-dimensional structure of hemoglobin...

3-dimensional structure of hemoglobin...

A Ramachandran plot generated from th...

A Ramachandran plot generated from th...

The structure hierarchy of Proteins

The structure hierarchy of Proteins

The left panel shows the hydrogen bon...

The left panel shows the hydrogen bon...

Alpha helix - Ball and stick model

Alpha helix - Ball and stick model

Alpha helix - Backbone

Alpha helix - Backbone

Alpha helix - Ribbon

Alpha helix - Ribbon

Side view of an ?-helix of alanine re...

Side view of an ?-helix of alanine re...

Top view of the same helix shown abov...

Top view of the same helix shown abov...

An example of the three-helix bundle ...

An example of the three-helix bundle ...

An example of the globin fold, the ox...

An example of the globin fold, the ox...

Example of homeodomain fold - The Ant...

Example of homeodomain fold - The Ant...

A trimer of the peridinin-chlorophyll...

A trimer of the peridinin-chlorophyll...

The hydrogen bond network in a 2-stra...

The hydrogen bond network in a 2-stra...

Diagram of ?-pleated sheet with H-bon...

Diagram of ?-pleated sheet with H-bon...

Illustration of the hydrogen bonding ...

Illustration of the hydrogen bonding ...

Illustration of the hydrogen bonding ...

Illustration of the hydrogen bonding ...

Representation of the beta hairpin of...

Representation of the beta hairpin of...

Beta-meander motif - Portion of outer...

Beta-meander motif - Portion of outer...

Representation of the Psi-loop motif.

Representation of the Psi-loop motif.

Example of an immunoglobulin domain, ...

Example of an immunoglobulin domain, ...

Ribbon diagram of the C-terminal WD40...

Ribbon diagram of the C-terminal WD40...

An example of a leucine-rich repeat p...

An example of a leucine-rich repeat p...

Flavodoxin fold - Ribbon diagram of C...

Flavodoxin fold - Ribbon diagram of C...

One molecule of human thioredoxin (PD...

One molecule of human thioredoxin (PD...

A deep trefoil knot in a Thermus ther...

A deep trefoil knot in a Thermus ther...

Ferredoxin fold - Ribbon diagram of a...

Ferredoxin fold - Ribbon diagram of a...

SH2 domain - Ribbon diagram of the SH...

SH2 domain - Ribbon diagram of the SH...

A canonical beta-barrel protein, a su...

A canonical beta-barrel protein, a su...

The human retinol-binding protein (RB...

The human retinol-binding protein (RB...

Top view of a triosephosphateisomeras...

Top view of a triosephosphateisomeras...

Side view of the same TIM barrel (PDB...

Side view of the same TIM barrel (PDB...

Ribbon diagram of the enzyme TIM, sur...

Ribbon diagram of the enzyme TIM, sur...

Membrane transport proteins in facili...

Membrane transport proteins in facili...

Membrane transport proteins in active...

Membrane transport proteins in active...

Ribbon-diagram showing carbonic anhyd...

Ribbon-diagram showing carbonic anhyd...

Diagram illustrating the induced fit...

Diagram illustrating the induced fit...

Space-filling model of the coenzyme NADH

Space-filling model of the coenzyme NADH

Diagram of a catalytic reaction, show...

Diagram of a catalytic reaction, show...

Mechanism for a single substrate enzy...

Mechanism for a single substrate enzy...

Saturation curve for an enzyme reacti...

Saturation curve for an enzyme reacti...

Competitive inhibitors bind reversibl...

Competitive inhibitors bind reversibl...

Types of inhibition. This classificat...

Types of inhibition. This classificat...

The coenzyme folic acid (left) and th...

The coenzyme folic acid (left) and th...

Phenylalanine hydroxylase. Created fr...

Phenylalanine hydroxylase. Created fr...

Lysozyme

Stabilization of the transition state...

Stabilization of the transition state...

The different mechanisms of substrate...

The different mechanisms of substrate...

Substrate, bound substrate, and trans...

Substrate, bound substrate, and trans...

Similar reactions will occur far fast...

Similar reactions will occur far fast...

Serine protease catalytic mechanism. ...

Serine protease catalytic mechanism. ...

Carboxypeptidase catalytic mechanism....

Carboxypeptidase catalytic mechanism....

Bacillus amyloliquefaciens proteins i...

Bacillus amyloliquefaciens proteins i...

A phosphorylated serine residue

A phosphorylated serine residue

HIV protease in a complex with the pr...

HIV protease in a complex with the pr...

Bacillus stearothermophilus phosphofr...

Bacillus stearothermophilus phosphofr...

Competitive inhibition: substrate (S)...

Competitive inhibition: substrate (S)...

Kinetic scheme for reversible enzyme ...

Kinetic scheme for reversible enzyme ...

Lineweaver–Burk diagrams of different...

Lineweaver–Burk diagrams of different...

Peptide-based protease inhibitor rito...

Peptide-based protease inhibitor rito...

Nonpeptidic protease inhibitor tipran...

Nonpeptidic protease inhibitor tipran...

Reaction of the irreversible inhibito...

Reaction of the irreversible inhibito...

Kinetic scheme for irreversible inhib...

Kinetic scheme for irreversible inhib...

Chemical mechanism for irreversible i...

Chemical mechanism for irreversible i...

Trypanothione reductase with the lowe...

Trypanothione reductase with the lowe...

Robots used for the high-throughput s...

Robots used for the high-throughput s...

The structure of a complex between pe...

The structure of a complex between pe...

Dihydrofolate reductase from E. coli ...

Dihydrofolate reductase from E. coli ...

The rate of reaction will increase as...

The rate of reaction will increase as...

Michaelis-Menten kinetics

Michaelis-Menten kinetics

IMC CC Noncommercial

Progress curve for an enzyme reaction...

Progress curve for an enzyme reaction...

Single-substrate mechanism for an enz...

Single-substrate mechanism for an enz...

Lineweaver–Burk or double-reciprocal ...

Lineweaver–Burk or double-reciprocal ...

Random-order ternary-complex mechanis...

Random-order ternary-complex mechanis...

Ping–pong mechanism for an enzyme rea...

Ping–pong mechanism for an enzyme rea...

Saturation curve for an enzyme reacti...

Saturation curve for an enzyme reacti...

Pre-steady state progress curve, show...

Pre-steady state progress curve, show...

Coupled assay for hexokinase using gl...

Coupled assay for hexokinase using gl...

Tropocollagen triple helix.

Tropocollagen triple helix.

Collagen

Julian Voss-Andreae's sculpture Unrav...

Julian Voss-Andreae's sculpture Unrav...

Microscopy of keratin filaments insid...

Microscopy of keratin filaments insid...

Schematic of 4 different protein sign...

Schematic of 4 different protein sign...

The bottom of this diagram shows the ...

The bottom of this diagram shows the ...

N-linked protein glycosylation (N-gly...

N-linked protein glycosylation (N-gly...

The eight sugars contained in glycopr...

The eight sugars contained in glycopr...

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