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The Structure and Main Functions of Aminopeptidase N

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Abstract:

Aminopeptidase N (APN)/CD13 is a type II metalloprotease that belongs to the M1 family of the MA clan, which consists of 967 amino acids with a short N-terminal cytoplasmic domain, a single transmembrane part, and a large cellular ectodomain containing the active site. APN has a molecular weight of 110,000. The APN exists in two forms namely the membrane aminopeptidase N and the soluble aminopeptidase N. Moreover, it exhibits the presence of various isozymes with different functions. APN is a ubiquitous enzyme present in a wide variety of human organs, tissues and cell types (endothelial, epithelial, fibroblast, leukocyte). It is a multifunctional enzyme, related with tumorigenesis, immune system, pain etc. Furthermore, it also serves as a receptor for coronaviruses and other human viruses. Besides the manifestation of various other functions, APN is also involved in the trimming of antigen and the process of antigen presentation. These functions facilitate the modulation of bioactive peptide responses (pain management, vasopressin release) and influence immune functions and major biological events (cell proliferation, secretion, invasion, angiogenesis) thereby providing treatment options for many kinds of diseases. This review will introduce the structure and main functions of APN briefly.

Keywords: Aminopeptidase N; NGR peptide; TNF; angiogenesis; cancer; enkephalins; immune cell; virus

Document Type: Research Article

DOI: http://dx.doi.org/10.2174/092986707780059571

Affiliations: Department of Medicinal Chemistry, School of Pharmaceutical Sciences, Shandong University, 44 West Culture Road, 250012 Ji’nan, Shandong, R.P. China.

Publication date: March 1, 2007

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  • Current Medicinal Chemistry covers all the latest and outstanding developments in medicinal chemistry and rational drug design. Each issue contains a series of timely in-depth reviews written by leaders in the field covering a range of the current topics in medicinal chemistry. Current Medicinal Chemistry is an essential journal for every medicinal chemist who wishes to be kept informed and up-to-date with the latest and most important developments.
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