CPK Atomic Models, L-Amino Acid Functional Groups

CPK Atomic Models Amino Acid Functional Groups

Twenty amino acid functional groups enable assembly of polypeptide sequences with 67-8011 and 67-8045

Item# Description U.S. List Price Quantity
67-8128 CPK Atomic Models, L-Amino Acid Functional Group, L-Alanyl
67-3716 CPK Atomic Models, L-Amino Acid Functional Group, L-Arginyl
67-3732 CPK Atomic Models, L-Amino Acid Functional Group, L-Asparaginyl
67-3724 CPK Atomic Models, L-Amino Acid Functional Group, L-Aspartyl
67-3750 CPK Atomic Models, L-Amino Acid Functional Group, L-Cysteinyl
67-3765 CPK Atomic Models, L-Amino Acid Functional Group, L-Glutaminyl
67-3757 CPK Atomic Models, L-Amino Acid Functional Group, L-Glutamyl
67-8086 CPK Atomic Models, L-Amino Acid Functional Group, L-Histidyl
67-3799 CPK Atomic Models, L-Amino Acid Functional Group, L-Isoleucyl
67-3807 CPK Atomic Models, L-Amino Acid Functional Group, L-Leucyl
67-3815 CPK Atomic Models, L-Amino Acid Functional Group, L-Lysyl
67-3823 CPK Atomic Models, L-Amino Acid Functional Group, L-Methionyl
67-3831 CPK Atomic Models, L-Amino Acid Functional Group, L-Phenylalanyl
67-8094 CPK Atomic Models, L-Amino Acid Functional Group, L-Prolyl
67-3856 CPK Atomic Models, L-Amino Acid Functional Group, L-Seryl
67-3864 CPK Atomic Models, L-Amino Acid Functional Group, L-Threonyl
67-8102 CPK Atomic Models, L-Amino Acid Functional Group, L-Tryptophanyl
67-3890 CPK Atomic Models, L-Amino Acid Functional Group, L-Tyrosyl
67-3898 CPK Atomic Models, L-Amino Acid Functional Group, L-Valyl
67-6692 CPK Atomic Models, Individual Atom, Hydrogen
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These L-Amino Acid functional groups complement the 67-7948 L-Amino Acids Assortment. Further, the 67-8011 Pentapeptide Chain Unit and the 67-8045 Decapeptide H-Bonding Unit when used with the functional group, enable the assembly of polypeptide sequences.

Assembling or Taking Apart CPK Atomic Models is Easy

Assembly 
A Connector Link is placed in the well on the end of the handle of the 67-7120 Construction Tool. The Connector Link is then pressed into the female socket of the atom. The second atom is simply pressed onto the first with a slight twist, and the bond is made.

Taking Apart 
To remove a Connector Link, the forked end of the 67-7120 Construction Tool is slipped around the center groove of the link, and the tool is pried upward.

The atoms are held together with great tenacity. A force of 5 to 7 kg is required to separate them. This force is readily furnished by the levering blade of the 67-7120 Construction Tool.

The marked superiority of the CPK® Atomic Models derives largely from Dr. Koltun’s Connector Links. His analysis of the engineering problems involved led him to combine new plastic materials with innovative link designs which satisfy four critical requirements simultaneously.

Since bond distances and angles for particular atoms are known to vary even in similar structures, two special links, in addition to the standard link, are provided to increase or decrease the normal bond distance by +0.08Å or -0.05Å.

A special ‘gluing’ link is also available for permanently connecting atoms at standard bond distances.

The various link types are color-coded to aid identification.

 

 

Specifications67-6692
ColorWhite
Covalent Radii Single Bond0.33
Scale Metric1.25
van der Waals Radii1.00

Scale
1.25 cm/Å. Large enough to maintain high accuracy, yet small enough so that macromolecules are not unwieldy. For example, a model 20 x 40 x 100 Å can be built on a table top.

Accuracy
Bond Angles ±0°30’; Covalent radii ±0.01Å; van der Waals radii ±0.03Å. These are as they occur in most biomolecular structures, and these data agree generally with those published by Corey & Pauling. However, several changes reflecting recent observations have been incorporated.

Density
Less than 1.0 gram/ml for a molecule as a whole. For maximum strength with minimum weight, the atoms are hollow. Except for hydrogen, they are injection-molded in Implex, a hard and durable modified acrylic polyester. Hydrogen has an elastically-compressible polyethylene shell.

Color
Atoms and connectors are easily identified since each component is color-coded. The color cannot be worn away since it is an integral part of the plastic. Further, atom surfaces are satin-finished so that they can be lighted easily for vivid photography to illustrate journal articles.

Restricted Rotation
The rotation of certain atoms may be prevented with a special keyed link, see 67-7039 Connector Link, Locking. The rotation of tetrahedral carbons in C-C bonds may be hindered with a special carbon link to produce the three-fold rotational potential characteristic of such bonds, see 67-7047 Connector Link, Carbon.

Hydrogen Bonding
Linear and non-linear bonded hydrogen species provide functional H-bonds to the appropriate species of nitrogen and oxygen. H-bond distance is adjustable.

Special Atom Species
A user may construct additional atom species not offered as regular CPK Atomic Models and use them with the regular CPK Atomic Models by attaching the 67-7088 Socket. This Socket takes all seven of the connector links offered.