Raghad zoubi

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Introduction

The α-amylases (EC 3.2.1.1 ) (CAS# 9014-71-5) (alternative names: 1,4-α-D-glucan glucanohydrolase; glycogenase) are calcium metalloenzymes, completely unable to function in the absence of calcium. By acting at random locations along the starch chain, α-amylase breaks down long-chain carbohydrates, ultimately yielding maltotriose and maltose from amylose, or maltose, glucose and "limit dextrin" from amylopectin. Because it can act anywhere on the substrate, α-amylase tends to be faster-acting than β-amylase. In animals, it is a major digestive enzyme, and its optimum pH is 6.7–7.0.[3]

In human physiology, both the salivary and pancreatic amylases are α-amylases.

The α-amylases form is also found in plants, fungi (ascomycetes and basidiomycetes) and bacteria (Bacillus)

Disease

Relevance

Structural highlights

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