A beta helix is a tandem protein repeat structure formed by the association of parallel beta strands in a helical pattern with either two or three faces. The beta helix is a type of solenoid protein domain. The structure is stabilized by inter-strand hydrogen bonds, protein-protein interactions, and sometimes bound metal ions. Both left- and right-handed beta helices have been identified. These structures are distinct from jelly-roll folds, a different protein structure sometimes known as a "double-stranded beta helix". The first beta-helix was observed in the enzyme pectate lyase, which contains a seven-turn helix that reaches 34 Å (3.4 nm) long. The P22 phage tail spike protein, a component of the P22 bacteriophage, has 13 turns and in its assembled homotrimer is 200 Å (20 nm) in length. Its interior is close-packed with no central pore and contains both hydrophobic residues and charged residues neutralized by salt bridges. Both pectate lyase and P22 tailspike protein contain right-handed helices; left-handed versions have been observed in enzymes such as and archaeal carbonic anhydrase. Other proteins that contain beta helices include the antifreeze proteins from the beetle Tenebrio molitor (right-handed) and from the spruce budworm, Choristoneura fumiferana (left-handed), where regularly spaced threonines on the β-helices bind to the surface of ice crystals and inhibit their growth. Beta helices can associate with each other effectively, either face-to-face (mating the faces of their triangular prisms) or end-to-end (forming hydrogen bonds). Hence, β-helices can be used as "tags" to induce other proteins to associate, similar to coiled coil segments. Members of the pentapeptide repeat family have been shown to possess a quadrilateral beta-helix structure. (Wikipedia).
To start using Tab for a Cause, go to: http://tabforacause.org/minuteearth2 You might already know that proteins are a fundamental part of your diet, but they're much more than that. LEARN MORE ************** To learn more about this topic, start your googling with these keywords: - Amino
From playlist Biology
A Level Biology Revision "Protein Structure 1"
In this video we start looking at the first two levels of protein structure. These are called the primary structure and the secondary structure. We start by looking at how the primary structure and how this is critical for the function of a protein. We then explore what is meant by seconda
From playlist A Level Biology Biological Molecules
Beta minus and beta plus decay explained: from fizzics.org
Beta minus and beta plus (positron) decay is explained for 16 to 19 advanced level students. This includes the changes in the parent atom and the changes within individual neutrons and protons. Free notes to support this video ares here: Supporting notes can be copied from here: https://w
From playlist Radioactivity
We've been hearing about DNA since the third grade, and we all know that it's a double helix with little ladder rungs. But now we are ready to understand this molecule on a more fundamental level, which will enable to us to understand how this molecule can serve as the genetic code. Let's
From playlist Biochemistry
A description of beta particle decay and the weak interaction.
From playlist Nuclear Physics
What is DNA Structure? How to Make a Double Helix with a 3D Pen | Biology | Biochemistry
DNA is a double-helix - it looks like a twisted ladder. Its backbone is made of sugars (deoxyribose) and phosphate groups, and the rungs of the ladder are made from 4 nitrogenous bases: Guanine, Adenine, Thymine, and Cytosine. The order of the “rungs,” or bases, is what determines what t
From playlist Biology
Biology Quiz: What is DNA and what does it do?
Ready to make the grade in biology? Subscribe to our new Biology channel to get more quizzes and biology animations! https://bit.ly/3jHu5UP #biology #DNA #shorts
From playlist 1 Minute Biology Quizzes
AlphaFold Protein Structure Database
With EMBL-EBI, we're proud to launch the AlphaFold Protein Structure Database, which offers the most complete and accurate picture of the human proteome, doubling humanity’s accumulated knowledge of high-accuracy human protein structures - for free. Try it today: dpmd.ai/alphafolddb
From playlist The story of AlphaFold
Arthur Mallay Lesk, The architecture of proteins - 8 maggio 2019
https://www.sns.it/it/evento/the-architecture-of-proteins Colloquio della Classe di Scienze Arthur Mallay Lesk (Penn State University) The architecture of proteins Abstract Proteins present us with a great variety of three-dimensional structures, selected to adopt unique folding patter
From playlist Colloqui della Classe di Scienze
Proteins, levels of Structure, Non-covalent Forces, excerpt 2 | MIT 7.01SC Fundamentals of Biology
Instructor: Graham Walker View the complete course: http://ocw.mit.edu/7-01SCF11 Professor Walker explains the categories of amino acids, the levels of protein structure, the bonds and forces in each level, and how they can influence protein structure. License: Creative Commons BY-NC-SA
From playlist MIT 7.01SC Fundamentals of Biology
Lec 3 | MIT 7.014 Introductory Biology, Spring 2005
Biochemistry II (Prof. Graham Walker) View the complete course: http://ocw.mit.edu/7-014S05 License: Creative Commons BY-NC-SA More information at http://ocw.mit.edu/terms More courses at http://ocw.mit.edu
From playlist MIT 7.014 Introductory Biology, Spring 2005
Introduction to Chemical Biology 128. Lecture 11. Proteins and Amino Acid Conformations, Part 2.
UCI Chem 128 Introduction to Chemical Biology (Winter 2013) Lec 11. Introduction to Chemical Biology -- Proteins and Amino Acid Conformations -- Part 2 View the complete course: http://ocw.uci.edu/courses/chem_128_introduction_to_chemical_biology.html Instructor: Gregory Weiss, Ph.D. Lice
From playlist Chem 128: Intro to Chem Biology
Complete Sampling Methods for Predicting Structures of... (GPCRS) by William A Goddard III
PROGRAM STATISTICAL BIOLOGICAL PHYSICS: FROM SINGLE MOLECULE TO CELL ORGANIZERS: Debashish Chowdhury (IIT-Kanpur, India), Ambarish Kunwar (IIT-Bombay, India) and Prabal K Maiti (IISc, India) DATE: 11 October 2022 to 22 October 2022 VENUE: Ramanujan Lecture Hall 'Fluctuation-and-noise' a
From playlist STATISTICAL BIOLOGICAL PHYSICS: FROM SINGLE MOLECULE TO CELL (2022)
Radioactivity (3 of 16) Three Types of Radioactive Decay, An Explanation
Explains three types of radioactive decay including alpha, beta and gamma decay. Also includes worked examples for each type of decay. During alpha decay the nucleus emits an alpha particle which is the equivalent of a helium nucleus, during beta decay the nucleus emits an electron which i
From playlist Radioactivity
Lec 4 | MIT 7.014 Introductory Biology, Spring 2005
Biochemistry III (Prof. Graham Walker) View the complete course: http://ocw.mit.edu/7-014S05 License: Creative Commons BY-NC-SA More information at http://ocw.mit.edu/terms More courses at http://ocw.mit.edu
From playlist MIT 7.014 Introductory Biology, Spring 2005
Protein Structure - Primary, Secondary, Tertiary, & Quarternary - Biology
This biology video tutorial provides a basic introduction into the four levels of protein structure - primary, secondary, tertiary and quarternary structure. The primary structure of a protein is based on the sequence of amino acids. The secondary structure is based on localized shapes s
From playlist Biochemistry
How to model Helical and Herringbone Gears; pros and cons (Gears pt 3/7)
Topics covered: 0:00 Modelling a helical gear using sweep 2:10 Creating a herringbone gear using mirror and combine 3:15 Creating a double helical gear 4:41 How to compute the angle to put into the sweep command 7:28 Positive and negative twist angles, or handedness 9:34 Transverse and nor
From playlist All about gears
3. Structures of Amino Acids, Peptides, and Proteins
MIT 7.016 Introductory Biology, Fall 2018 Instructor: Barbara Imperiali View the complete course: https://ocw.mit.edu/7-016F18 YouTube Playlist: https://www.youtube.com/playlist?list=PLUl4u3cNGP63LmSVIVzy584-ZbjbJ-Y63 After wrapping up the lecture on lipids, Professor Imperiali moves on t
From playlist MIT 7.016 Introductory Biology, Fall 2018
Alpha Decay, Beta Decay, Gamma Decay - Electron Capture, Positron Production - Nuclear Chemistry
This nuclear chemistry video tutorial provides a basic introduction into radioactive decay such as alpha decay, beta decay, gamma decay, electron capture and positron production. It contains plenty of examples and practice problems. Here is a list of topics: 1. Beta Decay of the Carbon-
From playlist New AP & General Chemistry Video Playlist