there are five levels of protein structure.
there are five levels of protein structure.
how many levels of protein structure are there?
five
protein structures range in size from tens to several thousand amino acids. by physical size, proteins are classified as nanoparticles, between 1–100 nm. very large aggregates can be formed from protein subunits. for example, many thousands of actin molecules assemble into a microfilament.









































a protein generally undergoes reversible structural changes in performing its biological function. the alternative structures of the same protein are referred to as different conformational isomers, or simply, conformations, and transitions between them are called conformational changes.









































section::::levels of protein structure.









































there are four distinct levels of protein structure.









































section::::levels of protein structure.:primary structure.
protein structure
in biology, a protein structure database is a database that is modeled around the various experimentally determined protein structures. the aim of most protein structure databases is to organize and annotate the protein structures, providing the biological community access to the experimental data in a useful way. data included in protein structure databases often includes three-dimensional coordinates as well as experimental information, such as unit cell dimensions and angles for x-ray crystallography determined structures. though most instances, in this case either proteins or a specific structure determinations of a protein, also contain sequence information and some databases even provide means for performing sequence based queries, the primary attribute of a structure database is structural information, whereas sequence databases focus on sequence information, and contain no structural information for the majority of entries. protein structure databases are critical for many efforts in computational biology such as structure based drug design, both in developing the computational methods used and in providing a large experimental dataset used by some methods to provide insights about the function of a protein.
protein structure database