What's the structural formula of protein molecule?

Question

Does anyone knows about the stuctural formula of a protein molecule?

Answer 1

Which protein molecule in particular?

A protein molecule basically consists of a string of amino acids joined together via amino-carboxyl (i.e. amide linkages CO-NH) linkages known as peptide bonds.

Amino: NH(2) and Carboxyl: COOH.

Polypeptide is a term used to describe the linear form of a protein. The structural/chemical formula of even the most basic of proteins would be very large and bear no proper definition of structure etc. Consider the fact that a single amino acid would have a formula such as C(3)H(7)NO(2) [alanine].

Now imagine a protein consisting of around 1000 amino acids, the structural formula would be considerably long!

Probably the best derivative of a structural formula would be something like: HOOC{[AA]CO-NH[AA]}nNH(2). Where n is subscript (i.e. the length of the chain/number of amino acids connected together) and AA represents an amino acid. The COOH represents the carboxyl terminal and thus beginning: the amino acid connected at this end is called the 1st amino acid. Similarly, the NH(2) represents the amino terminal and occurs at the end of the polypeptide.

Contrary to the other poster, there is no backbone in the polypeptides. A backbone such as a phosphate one occurs in DNA/RNA but not in proteins. Also, proteins certainly exist that consist of more than one chain folded onto each other. Haemoglobin has four separate chains bound together via a haem group that sits in the middle.

For 3d structure: the way in which the protein is folded together will depend on the various structures within the chain. Some of these include alpha helices, beta sheets etc. I can provide you with more specifics on primary, secondary and tertiary structure if you like.

Hope that clears things up for you. Email me if you need any further help.

Answer 2

Protein Structural Formula

Answer 3

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RE:
What's the structural formula of protein molecule?
Does anyone knows about the stuctural formula of a protein molecule?

Answer 4

From http://en.wikipedia.org/wiki/Protein:
"All amino acids share common structural features including an alpha carbon to which an amino group, a carboxyl group, and a variable side chain are bonded. The amino acids in a polypeptide chain are linked by peptide bonds formed in a dehydration reaction. The linked series of carbon, nitrogen, and oxygen atoms are known as the main chain or protein backbone. "

So basically you have a long string of individual amino acids that attach together along the "backbone". The side groups stick out from the backbone and allow the protein to take on its secondary structure (curled up, folded etc).

The backbone is N-C-C-N-C-C-N-C-C and so on. Each N-C-C is from an individual amino acid. The side group attaches to the first C.

Answer 5

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bonds would be the easiest. nucleic acids will have a phosphodiester bond in a backbone, lipids will have ester bonds (and long aliphatic chains), aminoacids will have amine and carboxyl groups at the ends, proteins will have peptide bonds and carbohydrates will have lots of carbons and hydroxyls attached to them.

Answer 6

which protein?