Difference Between Polar and Nonpolar Amino Acids

Key Difference – Polar vsNonpolar Amino酸

氨基酸可以根据polarityas polar amino acids and nonpolar amino acids. Thekey differencebetween polar and nonpolar amino acids is thatpolar amino acids have polarity whereas polarity is absent in nonpolar amino acids.

Amino acidare organic compounds. An amino acid is composed of anaminegroup (-NH₂),carboxylgroup (-COOH), thealkyl groupas a side chain (-R) and a hydrogen atom (-H). Therefore, an amino acid is formed from four basic chemical elements; C, H, O and N. Amino acids are the building blocks of proteins. Amino acids can be categorized in different ways based on the structure, synthesis, and properties such asessential and nonessential，极性和非极性。

内容

1.Overview and Key Difference
2.What is Polar Amino Acids
3.What is Nonpolar Amino Acids
4.Side by Side Comparison – Polar vs Nonpolar Amino Acids in Tabular Form
5.概括

What is Polar Amino Acids?

Polar amino acids are amino acids that have polarity. Polar amino acids can be found in three types as neutral amino acids, positively charged amino acids and negatively charged amino acids. Polar amino acids with no charge have no charge on the “R” group (side chain). These amino acids can be found participating in thehydrogen bondformation in protein molecules. Example, amino acids for this group, are serine, threonine,tyrosine,cysteine,谷氨酰胺，and asparagine.

Polar amino acids with a positive charge contain more amino groups than carboxylic groups. Then the amino acid becomes more basic. These amino acids have the positive charge on the “R” group. The examples for this category includelysine,arginine和组氨酸。

Polar amino acids with a negative charge have more carboxyl groups compared to amine groups. Then the amino acid becomes more acidic. The negative charge of these amino acids can be found in the “R” group. Examples of this group include aspartic acid and谷氨酸.

什么是非极性氨基酸？

非极性氨基酸是没有极性的氨基酸。那是因为这些氨基酸具有相等数量的羧酸基和胺基。这使这些非极性氨基酸具有中性电荷。他们对“ R”小组不收取任何费用。

非极性氨基酸的疏水性. Examples of nonpolar amino acids include alanine, valine, leucine, isoleucine, phenylalanine, glycine, tryptophan, methionine and proline.

What is the Difference Between Polar and Nonpolar Amino Acids?

极性与Nonpolar Amino Acids
Polar amino acids are amino acids that have polarity.	非极性氨基酸是没有极性的氨基酸。
极性
极性is present in polar amino acids.	非极性氨基酸不存在极性。
Hydrophobicity
Polar amino acids are hydrophilic.	非极性氨基酸的疏水性.
Examples
Examples of polar amino acids include serine, lysine and aspartic acid.	Alanine, valine, leucine, isoleucine, phenylalanine, glycine, tryptophan, methionine, proline.

概括–极性与Nonpolar Amino酸

Amino acids are the building blocks of proteins. There are several different ways of grouping amino acids based on the structure and properties. Polar amino acids and nonpolar amino acids are categorized based on the polarity of the amino acid. The difference between polar and nonpolar amino acids is that polar amino acids have polarity whereas polarity is absent in nonpolar amino acids.

Reference:

1.“Polar Amino Acids.” Polar Amino Acids, Non Polar Amino Acids |[电子邮件保护]Available here
2.“Amino Acid.” Wikipedia, Wikimedia Foundation, 16 Mar. 2018.Available here
3.Gorga, Frank R. “Non-Polar Amino Acids.” Non-Polar R Groups, 1999.Available here

Image Courtesy:

1.’Figure 03 04 02’ByCNX OpenStax,(CC BY 4.0)viaCommons Wikimedia