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Napin is one of the two most abundant seed storage proteins in the seeds of dicot crop mustard and rapeseed (Brassica napus L., B. juncea L. Czern., B. nigra L. W.D.J.Koch, B. rapa L. and Sinapis alba L.). They are water soluble low-molecular weight basic proteins classified as 2S or 1.7S proteins, representing 20–40% of total seed protein, and having a molecular weight in the range of 12–17 kDa. Their isoelectric point varies based on the method of extraction and the specific characteristics of the isoforms that exist. They are composed of two polypeptide chains, a 4.5 kDa small subunit and a large 10 kDa subunit, stabilized primarily by disulphide bonds. Their secondary structure shows a high α-helical content.
Properties
Arginine, lysine, and cysteine make napines excellent antibacterials, and since it is a basic protein, it can change its acidity to make it more effective. Some in silico and in vitro antimicrobial activity screening reported napins as antimicrobial and antifungal peptides.
= Structure
=As a basic protein, napin can be used to bind together and determine the shape, properties, and be able to synthesize when seeds develop.
Composition
In terms of molecular weights, napin polypeptide chains are made up of 9,900 and 4,000 amino acids held together by disulfide bonds .The amino acid sequence of napin cDNA clones and napin peptide fragments indicate napin starts as a 178-residue precursor.
= Solubility =
Napin is water soluble and soluble in a wide pH range.
References
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Napin - Wikipedia
Napin is one of the two most abundant seed storage proteins in the seeds of dicot crop mustard and rapeseed (Brassica napus L., B. juncea L. Czern., B. nigra L. W.D.J.Koch, B. rapa L. and …
The Biosynthesis, Structure and Properties of Napin - ScienceDirect
01 Apr 1999 · Various functional and structural data on napin, the 2S storage protein of rape (Brassica napus), have been accumulated. The primary structures of genes, eDNA as well as …
Structure of the rapeseed 1.7 S storage protein, napin, and its ...
05 Nov 1986 · Napin (1.7 S protein) is a basic, low molecular weight storage protein synthesized in rapeseed (Brassica napus) embryos during seed development. Napin is composed of two …
Structural Properties of Cruciferin and Napin of
These two storage proteins of B. napus have distinct molecular characteristics, therefore properties and functionalities they provide are contrasting rather than complementary. …
Structure of the Rapeseed 1.7 S Storage Protein, Napin, and …
Sequence analyses of napin polypeptide chains and of a cDNA clone encoding napin have enabled the elucidation of the primary structure of both the precursor and the mature napin …
Structural and Functional Annotation of Napin-Like Protein from
19 Jul 2021 · Bioinformatics analyses of napin gene and napin-like protein were performed to reveal their structural and functional gene annotations, physicochemical properties, 3D …
Napin from Brassica juncea: Thermodynamic and structural analysis of ...
01 Jul 2007 · Napin of B. juncea is a basic protein that is allergenic in nature. There are four aromatic residues – one tyrosine, one tryptophan and two-phenylalanine residues – in the …
UniProt
The small, basic, water-soluble napins are one of the two major kinds of storage proteins synthesized in the seed during its maturation. Curated
(PDF) Structure of the rapeseed 1.7 S storage protein, napin, and its ...
01 Des 1986 · Napin (1.7 S protein) is a basic, low molecular weight storage protein synthesized in rapeseed (Brassica napus) embryos during seed development.