• Home
  • Forum
  • Dictionary
  • Articles
  • Tutorials
  • Books
  • Directory
  • Share your work


Dictionary » A » Alpha-amylase

Alpha-amylase

Definition

noun, plural: alpha-amylases

A form of amylase in humans and other mammals that cuts alpha-bonds of large sugar molecules.


Supplement

In animals, the alpha-amylases are major digestive enzymes. The ptyalin (salivary amylase) and pancreatic amylase are examples of alpha-amylase. Ptyalin acts on linear α (1,4) glycosidic linkage to break large, insoluble starch molecules into soluble starches (amylodextrin, erythrodextrin, achrodextrin) producing successively smaller starches. Pancreatic α-amylase randomly cleaves the α (1-4) glycosidic linkages of amylose to yield dextrin, maltose or maltotriose. Alpha-amylases are calcium metalloenzymes, which means, they function only in the presence of calcium.

They are also found in plants, such as barley, and fungi (ascomycetes and basidiomycetes).


"Synonym: 1,4-α-D-glucan glucanohydrolase

Compare: beta-amylase


Please contribute to this project, if you have more information about this term feel free to edit this page



Results from our forum


Hyperadrenergic POTS

... pharmacological NET inhibition can recreate an orthostatic tachycardia phenotype in susceptible healthy volunteer subjects. Yohimbine, a central alpha-2 antagonist that will also increase synaptic norepinephrine, can also cause orthostatic tachycardia. How do you test for a genetic hNET mutation? ...

See entire post
by rmorrison
Wed Mar 19, 2014 5:38 pm
 
Forum: Human Biology
Topic: Hyperadrenergic POTS
Replies: 0
Views: 42

Re: Streptococcus sanguis??

Don;t understand why you wasted so much media and time with irrelevant tests. Please determine if this isolate shows alpha hemolysis on blood agar.

See entire post
by Cepacia
Sat Dec 21, 2013 1:22 pm
 
Forum: Microbiology
Topic: Streptococcus sanguis??
Replies: 1
Views: 806

Bacterial Taxonomy

... nitrogen gas to ammonia is unique to Cyanobacteria. Proteobacteria are very, very diverse and better discussed in terms of the individual classes alpha, beta, gamma, delta, and epsilon. Prosthecae indicate membership in alphaproteobacteria. And I'll leave it at that for now.

See entire post
by wildfunguy
Sat Oct 19, 2013 6:12 pm
 
Forum: Microbiology
Topic: Bacterial Taxonomy
Replies: 3
Views: 1530

Protein structure

Hi guys, I know that Protein structure related to their function. Certain protein usually have alpha helix is more prominent but certain protein have beta structure more prominent. My question is which amino acid is favourable to form alpha helix and beta structure? What ...

See entire post
by kanagasundar
Sat Sep 14, 2013 2:40 am
 
Forum: Cell Biology
Topic: Protein structure
Replies: 1
Views: 517

unbalanced gender ratios of offspring

... I am not sure on this. Even if primates organize into polygynous groups, the females probably won't remain faithful. Furthermore, nobody is alpha male for life. They get old, weak, and frail, and some young guy kicks their groin. One male impregnating several females reduces genetic diversity ...

See entire post
by wildfunguy
Sat Sep 07, 2013 10:47 pm
 
Forum: Human Biology
Topic: unbalanced gender ratios of offspring
Replies: 6
Views: 2761
View all matching forum results

This page was last modified 14:08, 10 August 2009. This page has been accessed 8,404 times. 
What links here | Related changes | Permanent link