Protein Flashcards

1
Q

Aromatic amino acids

A

Tyrosine
Tryptophan
Phenylalanine

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2
Q

Most basic and most acidic protein

A

Basic - Arginine
Acidic - Aspartate

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3
Q

Amino acid per residues and pitch of alpha helix

A

3.6 amino acid per residues
Pitch - 0.54nm

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4
Q

Axial rise of alpha and beta protein

A

1.5 Å and 3.5 Å

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5
Q

Amino acid in Collegen

A

Glycine, proline and hydroproline/ hydroxylysine

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6
Q

Amino acid helps in hydroxylation of Collegen

A

Ascorbic acid

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7
Q

Amino acid of Elastin and Keratins

A

Glycine and Proline
Cysteine

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8
Q

Molecular chaperone and eg.

A

Proteins that help in interaction with other protein and aid in their folding.
Eg. Foldases and holdases.

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9
Q

Two subcomplex of proteasome

A

20S core and 19S proteasome forms 26 S or 30 S Proteasome.

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10
Q

Ubiquitin binds to protein by which bond and by which residue.

A

Covalent bond and by lysine residue

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11
Q

Ring of the following
Phenylalanine
Tryptophan
Cysteine
Histidine

A

Phenylalanine - Phenyl ring
Tryptophan - Indole ring
Cysteine - Sulfhydryl or thiol group
Histidine - Imidazole ring

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12
Q

Deamination of 5 methyl cytosine
Cytosine
Adenine
Guanine

A

Thymine
Uracil
Hypoxanthine
Xanthine

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13
Q

Degrons

A

Aka degradation signal guides the metabolic stability of proteins.

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14
Q

N degron

A

The first amino acid present in the n terminal that causes degradation

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15
Q

N end rule pathway

A

Proteins with degrons degrade protein by this pathway by ubiquitination

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16
Q

Reagents used to determine n terminal amino acid

A

1 fluoro 2,4 dinitrobenzene, Phenylisothiocyanate (Edman Reagent) and dansyl chloride

17
Q

Method to determine sequence of amino acid of n terminal and name the chemical

A

Edman degradation method
Chemical - Phenylisothiocyanate (edman reagent)

18
Q

Which amino acid is not found in its primary form and what is it called

A

Proline or imino acid is found in its secondary form only

19
Q

What is isoelectric precipitation

A

Proteins and its isoelectric points are not soluble in water hence they get precipitated

20
Q

Which bonds are responsible for tertiary structure

A

Hydrophobic bond (major bond)
Electostatic interaction or salt bridges or ionic bond
Hydrogen bond
Van der waal forces

21
Q

What is a protein found in hemoglobin

A

Histidine