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Visualizing hla-aw with protein explorer

Protein Explorer is designed as a user-friendly but fairly full-featured visualizer. It is not as scriptable or as powerful as some other visualizers such as VMD and PyMol, but it is one of the quickest and easiest to get started with. It is used through a web browser, either by accessing it through the Protein Explorer website (via the Quick-Start Protein Explorer link), or as an offline version, downloadable from this page . Both versions require the MDL Chime molecular viewing plugin, which you can download from here (registration required).

As with VMD above, a human leukocyte-associated antigen, HLA-AW (PDB structure ID 2HLA), will be shown in various renditions.

Upon opening, Protein Explorer will load a default molecule and display it (this feature may be disabled via a setting under "preferences" in the lower left frame):

Protein explorer at startup

The interface contains three areas. The frame on the right contains the rendering window, where the molecule is displayed. The lower left frame contains an input box for text commands and a text box that displays general text output from the program: What commands have been executed, what the program is currently doing, etc. The top left frame generally contains the user interface in the form of buttons and links. Its exact contents vary with use.

Clicking on the "PE Site Map" link pops up a window containing Protein Explorer's top-level menu:

Protein explorer site map window

Each option contains a helpful tooltip which can be seen by hovering the mouse cursor over it. "New Molecule" allows the user to load a molecule either directly from the PDBor from the local filesystem. "Reset Session" returns to the default view and rendering style, which can be a useful shortcut. "Quick Views" opens up a menu from which the user canselect how the molecule is rendered.

Once a molecule is loaded, the "Quick Views" menu allows the user to control how it is displayed:

Protein explorer quickviews interface

The "SELECT" pulldown menu allows the user to pick a group of atoms based on their properties, their location, the structural elements in which they are involved, or by directly clicking them.The "DISPLAY" pulldown menu then allows the user to determine the style in which the selected atoms are rendered. Most of the styles available through VMD are also available in Protein Explorer. The "COLOR" pulldown menuallows the user to determine how the atoms are colored. Options include coloring by secondary structure elements, atom type, subunit (chain), a spectrum from end to end of the protein, and by properties such ascharge and polarity.

Protein explorer: hla-aw backbone rendering

This rendering mode shows the protein backbone (no side chains) through the alpha carbons of each amino acid residue. It gives the user a sense of how the chains fold to form the structure, but not it's full shape, since all side chain atoms have been removed. The yellow bars are disulfide bonds, which are covalent bonds that lock distant parts of the chain together to help maintain the structure.

Protein explorer: hla-aw cartoon style

Cartoon rendering works as for VMD. As in the backbone rendering above, side chains are ignored, and the protein backbone is rendered as a smoothly curving tube. Beta sheets appear as flattened arrows, and alpha helices appear as spiraling ribbons.

Protein explorer advanced explorer menu

More advanced rendering methods are available through the Advanced Explorer Menu.

Protein explorer surfaces menu

The Surfaces menu allows the user to display the surface of the protein. Several variable are available, including the radius of the probe used to define the surface, as well as several methods of coloring the surface based onchemical and physical properties.

Protein explorer: hla-aw surface rendering

This rendering style shows the surface of the protein accessible to water. This image is tilted 90 degrees toward the viewer from the previous images.

Protein explorer: hla-aw superimposed images

By setting the surface to be transparent, it is possible to superimpose another rendering style over it, and see how it fits into the surface. This can convey an idea of how the fold of the chain relates to the overall three-dimensional shape of the protein.

  • A detailed introduction to protein structure and function can be found in most introductory biochemistry textbooks. For example, Lehninger Principles of Biochemistry, 4th Edition, by D. L. Nelson and M. Cox (sections 2.1, 3.1-3.5, 4.1-4.4, 5.1-5.3).
  • The Structures of Life at the NIH web site. This site is an introduction to protein structure, structure determination methods, drug design techniques, and other applications of structural biology.
  • Protein Structure and Function , by Gregory A. Petsko and Dagmar Ringe. This book provides an overview of the basic biochemistry of structural biology. Topics covered include protein structure, mechanisms of protein function, regulation of protein function, and case studies of the kinds of problems that arise in structural biology.
  • The MIT Biology Hypertextbook . This online textbook provides introductory level coverage of the field of microbiology. It includes cell biology, protein biochemistry, genetics, metabolism, and molecular biology. New content is typically added over time.
  • Artificial Intelligence and Molecular Biology . This online book includes chapters on classifying protein structures, predicting protein structure, and analyzing crystallographic and NMR data to determine protein structure. Of particular interest to readers of the current page who have a computer science background but need to understand more of the basic underlying biology is Chapter 1: Molecular Biology for Computer Scientists .

Questions & Answers

where we get a research paper on Nano chemistry....?
Maira Reply
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
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Source:  OpenStax, Geometric methods in structural computational biology. OpenStax CNX. Jun 11, 2007 Download for free at http://cnx.org/content/col10344/1.6
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