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Industrial Micro LAB > PRELAB 3.6 Secondary structure > Flashcards

PRELAB 3.6 Secondary structure Flashcards

1
Q

This is proposed by
when

A

Linus Pauling
Robert Corey
1951

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2
Q

2° is held together by

A

carbonyl and amide group

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3
Q

Aside from alpha helix and beta-pleated sheet, it also has ____, ____, and _____

A

beta-bends
non-repetitive structures
super-secondary structures

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4
Q

__________ propose essential features of peptides units and polypeptide backbone

A

Linus pauling

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5
Q

In ____ he examined the nature of peptide bonds through AA using ______

A

1930
X-ray diffraction

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6
Q

Linus found out that

A

Amide group - rigid, planar due to resonance
Rotation bet C-N is not feasible (partial double bonds)
but can take place in C-N and C-C bonds

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7
Q

____ configuration is more stable that____ for R-groups at ____.

A

Trans more stable than Cis
at C

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8
Q

_______ is formed when a region of a polypeptide chain _____ around itself

A

Alpha helix
coils

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9
Q

Alpha helix forms through the bonding of ____ and ___ forming a _____ and is separated by ______amino acid residues

A

Carbonyl group and amide group

four

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10
Q

ALPHA HELIX
A. structure

A
  • spiral, tightly pack, coiled pp backbone core
  • side chain extends outwards
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11
Q

ALPHA HELIX
B. stabilization

A
  • stabilized by H bonding bet carbonyl oxygen and amide hydrogen
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12
Q

ALPHA HELIX
C. residues per turn

A

3.4 (4) residues per turn

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13
Q

ALPHA HELIX
D. are found in

A

globular proteins like myoglobin and troponin-C

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14
Q

in alpha helix the side chain of AA appears ____

A

polar

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15
Q

Beta sheet is formed when two parts of a polypeptide chain lie ______

A

side by side

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15
Q

B sheets are formed between several polypeptide strands which can be oriented ___________

A

parallel or antiparallel

16
Q

Individual polypeptide in beta sheet is called___________

A

Beta strand

17
Q

Stabilized by H bonds between

A

N-H and carbonyl of adjacent chains

Industrial Micro LAB (23 decks)

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