Secondary Structure of Proteins | MCAT Biochemistry скачать в хорошем качестве

Secondary Structure of Proteins | MCAT Biochemistry

This video talks about the secondary structure of proteins. The secondary structure of proteins refers to the local spatial arrangements of the polypeptide chain. It is primarily characterized by regular, repeating structural patterns that result from hydrogen bonding between amino acids. The two main types of secondary structures are the alpha helix and the beta sheet. Alpha Helix: In an alpha helix, the polypeptide chain adopts a helical or spiral shape. The backbone of the helix is stabilized by hydrogen bonds formed between the carbonyl oxygen of one amino acid and the amino hydrogen of an amino acid located four residues down the chain. Alpha helices are common in regions of proteins that span cell membranes or in parts that require a compact and stable structure. Beta Sheet: In a beta sheet, the polypeptide chain folds back and forth on itself, forming a sheet-like structure. The backbone of the sheet is stabilized by hydrogen bonds formed between adjacent strands of the polypeptide chain. Beta sheets can be parallel (strands run in the same direction) or antiparallel (strands run in opposite directions), influencing the overall stability and structure of the protein. These secondary structures often coexist within a protein, and their arrangement contributes to the protein's tertiary structure (overall 3D shape). The secondary structure is crucial for understanding a protein's folding and function. This video will help you learn the basics and foundational knowledge needed to ace your exams! Timestamps 0:00 Intro 0.17 Intro to protein structures 0:35 Intro to secondary structures of proteins 0:56 Two types of secondary structures 1:11 Alpha helices of secondary protein structures 1:48 Beta sheets of secondary protein structures 2:31 Beta turns and loops 2:56 The impact of secondary structures of tertiary structures of proteins 3:21 Outro Thanks for watching! I hope this was helpful for you. ------------------------------------------------------------------------------------------------------------ **Subscribe for more free lessons:    / @themedtutor**   ------------------------------------------------------------------------------------------------------------ Check Out Some of Our Other Lessons Biochemistry Playlist:    • Biochemistry   Chemistry Playlist    • Chemistry   Anatomy Playlist    • Anatomy   Cell Biology Playlist    • Cell Biology   Amino Acids Playlist    • Amino Acids | MCAT Biochemistry