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Proteomic knowledge of human aquaporins
Fulvio Magni1, Cecilia Sarto, Davide Ticozzi
1Department of Experimental, Environmental Medicine and Medical Biotechnologies, University of Milano-Bicocca, Monza, Italy.
Proteomics
|October 18, 2006
Summary
Aquaporins (AQPs) are essential proteins that facilitate water and solute transport in the human body. This review covers their genomics, structure, function, and clinical relevance, particularly AQP1 in disease.
Area of Science:
- Molecular Biology
- Biochemistry
- Cell Biology
Background:
- Aquaporins (AQPs) are integral membrane proteins crucial for transmembrane water and small solute transport.
- The human genome encodes 13 AQPs, categorized by their transport selectivity (water-only or water/solute).
- Key conserved features include sequence similarity and two NPA (Asp-Pro-Ala) motifs.
Purpose of the Study:
- To provide a comprehensive overview of aquaporin genomics, structure, and function.
- To discuss proteomic methodologies for AQP identification and characterization.
- To highlight the clinical significance of aquaporins, with a focus on AQP1 in human diseases.
Main Methods:
- Literature review of genomic, structural, and functional studies on aquaporins.
- Discussion of proteomic techniques, including SDS-PAGE and Mass Spectrometry (MS) for AQP analysis.
- Review of clinical research implicating aquaporins in various pathologies.
Main Results:
- Detailed classification of 13 human AQPs into water-specific and broader solute transporters.
- Emphasis on proteomic approaches for identifying and characterizing AQP expression profiles.
- Established roles of specific AQPs, especially AQP1, in physiological processes and disease pathogenesis.
Conclusions:
- Aquaporins represent a vital protein family with diverse transport functions and significant implications for human health.
- Proteomic analyses are instrumental in understanding AQP roles and their dysregulation in disease.
- Targeting aquaporins, particularly AQP1, holds therapeutic potential for various human diseases.
Related Concept Videos
01:25Aquaporins
Aquaporins or AQPs are a family of integral membrane proteins whose primary function is to transport water, while some called aquaglyceroporins also transport glycerol. In addition, aquaporins have also been suspected to be involved in transporting volatile substances, such as carbon dioxide and ammonia, across membranes. Such AQPs that act as gas channels are often highly expressed in cells involved in the gaseous exchange, such as red blood cells, epithelial cells, and pulmonary capillaries.
01:44The Significance of Membrane Transport
The transport of solutes across the cell membrane is essential for metabolic processes, like maintaining cell size and volume, generating the action potential, exchanging nutrients and gases, etc. Membrane transport can be either passive or active. It can be simple diffusion, facilitated, or mediated transport aided by transport proteins such as transporters and channels.
Transporters facilitate either an active or passive movement of solutes. They can allow a single-molecule transport down its...
Transporters facilitate either an active or passive movement of solutes. They can allow a single-molecule transport down its...
01:26Reabsorption and Secretion in the DCT and Collecting Duct
The early phase of the DCT manages the reabsorption of approximately 10-15% of filtered water, 5–10% of filtered sodium, and 5–10% of filtered chloride. This process is facilitated by Na+–Cl− symporters in apical membranes and sodium-potassium pumps, as well as Cl− leakage channels in basolateral membranes. The early DCT also stands out as a site where parathyroid hormone (PTH) stimulates calcium reabsorption, depending on the body's requirements.
The distal part of the DCT, along with the...
The distal part of the DCT, along with the...
01:33Proteomics
A proteome is the entire set of proteins that a cell type produces. We can study proteomes using the knowledge of genomes because genes code for mRNAs, and the mRNAs encode proteins. Although mRNA analysis is a step in the right direction, not all mRNAs are translated into proteins.
Proteomics is the study of proteomes' function. It involves the large-scale systematic study of the proteome to denote the protein complement expressed by a genome. Scientist Mark Wilkins coined the term proteomics...
Proteomics is the study of proteomes' function. It involves the large-scale systematic study of the proteome to denote the protein complement expressed by a genome. Scientist Mark Wilkins coined the term proteomics...
01:17Pore Transport and Ion-Pair Transport
Pore transport and ion-pair formation are critical mechanisms for the absorption and distribution of drugs in the body.
Pore transport, also known as convective transport, is a process where small molecules like urea, water, and sugars rapidly cross cell membranes as though there were channels or pores in the membrane. Although direct microscopic evidence is limited but the concept of pores or channels is widely accepted based on physiological evidence. Despite the lack of direct microscopic...
Pore transport, also known as convective transport, is a process where small molecules like urea, water, and sugars rapidly cross cell membranes as though there were channels or pores in the membrane. Although direct microscopic evidence is limited but the concept of pores or channels is widely accepted based on physiological evidence. Despite the lack of direct microscopic...
01:29Primary Active Transport
In contrast to passive transport, active transport involves a substance being moved through membranes in a direction against its concentration or electrochemical gradient. There are two types of active transport: primary active transport and secondary active transport. Primary active transport utilizes chemical energy from ATP to drive protein pumps embedded in the cell membrane. With energy from ATP, the pumps transport ions against their electrochemical gradients—a direction they would not...