I have a sequence of amino acids from a protein . This polypeptide chain has a predicted pI of 5.05 and appears to bind to another protein that is more basic. What can you predict from these data? HINT: What proteins do you know that bind to each other?a. This sequence may have a significant secondary structure. b. This sequence may be an acidic beta-sheet. c. This sequence may be an acidic alpha helix. d. All of the above are possible.

c

Explanation:

A polypeptide is any such polymer that is not folded into a secondary structure of a protein. A small protein containing up to 100 amino acids.

An alpha helix is a secondary structure found in many proteins, where the amino acids are arranged in a coil, or helix, with almost no free space on the inside and all side chains being pointed towards the outside.

This sequence may have significant secondary structure. This sequence may be an acidic alpha helix.

Secondary Structure of a protein is defined as the local conformation of protein backbone. Primary Structure-folding-Secondary.

It may have regular a helix and B sheet or made up of random coils, tight turns and budges.

1st step in prediction of protein structure..

Technique concerned with determination of secondary structure of given polypeptide by locating the Coils, Alpha Helix, Beta Strands in polypeptide chains..

Helix structures are made up >alanine,glutamine,leucine,methionine

Helix breaking acid involves proline and glycine

Beta sheet consist of isoleucine,valine,tyrosine

Beta breaking acid includes proline,aspargine,glutamine

Most Turn contains proline ,serine ,lysine, aspargine, Glycine, aspartic acid ,serine ,tyrosine in diminishing proportions respectively.

Amino acid like glycine can also disrupt alpha helix.

Based on the analysis above the sequence given is has a alpha helix structure of peptide sequence.

Single alpha helix can be as long as 35 amino acid residue.

The sequence above satisfies nearly every requirement needed form a alpha helix structure.

what bodys are there orbiting?