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1. Alpha Helix
  • rod like
  • CO & NH of the mainchain are hydrogen bonded together, allowing the mainchain to be buried
  • n+4 H bonding scheme
  • all alpha carbons are H bonded and in line with each other
  • R groups are on the outside & backbone on the inside
  • always right handed (clockwise)
  • can be a single chain (usually less than 45 Angstroms)
  • Residues that are 1 & 2 residues apart are on opposite sides, while residues that are 3 & 4 residues apart are on the same side; this allows small steric hindrance
  • 1.5 Angstroms rise (from one alpha carbon to the second)
  • 100 degree rotation
  • 3.6 residues per turn
  • Ramachandran diagrams (1) Right handed: can only occur between -60, -60; little hindrance (2) Left handed: +60, +60; large hindrance
2. Beta Sheet
  • sheet like
  • Beta sheets are formed by linking 2 or more Beta strands by H bonds
  • side chain of adjacent residues point in opposite directions
  • only trans peptide bonds give R groups on opposite sides
  • cannot exist as a single Beta strand; must be 2 or more
  • in proteins, 4-5 strands make up a beta sheet; it is possible to be made of more than 10
  • 3.5 Angstroms rise between residues
  • 7 Angstroms between R groups
  • Arrow in pictures always points to the CO group
  • can be antiparallel, parallel, or mixed
  • anti: 1:1; alpha carbons are completely lined up across from each other; CO & NH of adjacent strands are H bonded together; chains are in opposite directions
  • parallel: strands are in the same direction; NH group of the first chain is bonded to the CO of the 2nd chain through H bond, then move two residues to the right and the CO of the first chain is H bonded to the NH of the 2nd chain.
  • Ramachandran diagrams: exists between -60 to -120, 100-190
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13y ago

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More answers

A beta strand is a single chain of amino acids with a specific conformation, while a beta sheet is formed when two or more beta strands align and hydrogen bond with each other. Beta strands are the building blocks of beta sheets, which are a common secondary structure in proteins.

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AnswerBot

9mo ago
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Alpha helix and beta pleated sheets both are held together with H bonds between carbonyl O and amino N. Alpha helix specifies with residues bind. Beta pleated sheets can happen between any 2 residues.

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Wiki User

10y ago
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Stabilized by hydrogen bonds, hydrogen bonding between amides groups

Polypeptide secondary structures.

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14y ago
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Beta sheets consist of beta strandsconnected laterally by at least two or three backbone hydrogen bonds, forming a generally twisted, pleated sheet.

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12y ago
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Secondary structure

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13y ago
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Q: What is the difference between beta strand and beta sheet?
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What is a beta pleated sheet in DNA?

A regular element of secondary structure in proteins, in which two or more extended strands of the polypeptide chain lie side by side (running either parallel or antiparallel), held together by a regular array of hydrogen bonds between backbone NH and C=O groups, to form a ridged planar surface. The amino-acid side chains alternately face to opposite sides of the sheet.


What level of molecular organization is a beta-folded sheet?

A beta-folded sheet is a secondary structure of a protein, which is the next level of molecular organization above the primary structure. It is formed by hydrogen bonding between adjacent segments of a polypeptide chain, creating a flat and elongated sheet-like structure.


What is the difference between a beta plus particle and a beta minus particle?

The difference between a beta plus and beta minus particle is the electrical charge. The charges are equal, but opposite. The beta minus particle is an electron with a negative charge, while the beta plus particle is an anti-electron or positron with a positive charge.


What do you call the 2 types of secondary protein structure which are evident in a polypeptide cha in?

The two types of secondary protein structure are alpha helix and beta sheet. In an alpha helix, the polypeptide chain is tightly coiled in a helical shape, while in a beta sheet, the polypeptide chain is folded into a sheet-like structure with hydrogen bonds between neighboring strands.


How many beta sheet hemoglobin have?

Hemoglobin does not contain beta sheets. It is a globular protein composed of four subunits - two alpha and two beta subunits in adults (hemoglobin A). Each subunit consists of alpha-helices, not beta sheets.