Channel proteins

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m (I corrected some minor grammatical errors as well as adding in information about how the ione selectivity filter works due to its size. I also added a link to the 'potassium' page.)
 
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Channel proteins; these are one of the two classes of membrane transport [[Proteins|proteins<font color="#b00000">.</font>]] These proteins span the entire membrane, they are transmembranal, water-filled pores that allow specific water-soluble ions to pass. They only allow specific solutes to passively traverse [[Lipid bilayer|lipid bilayers]] through an [[Aqueous pore|aqueous pore]] due to the specific size of the ion selectivity filter; the narrowest part of the channel protein only allows specifically charged and sized molecules to pass through<ref>BiologyWise. A Face-off between carrier proteins vs. channel proteins. 2017. [cited 18/11/18]; Available from https://biologywise.com/carrier-proteins-vs-channel-proteins</ref>. For example the [http://en.m.wikipedia.org/wiki/Potassium_leak_channel potassium leak channels] will only allow [[Potassium|potassium]] to travel through them. Most solutes that pass through channel proteins have a specified [[Molecular weight|molecular weight]] and charge and are inorganic ions. The concentration and electrical gradients of charged ions determines the direction of flow of the ions and also the rate through the membrane; they move from an area of high to low concentration in processes known as either [[Passive transport|passive transport]] or [[Facilitated diffusion|facilitated diffusion]]. The movement of [[Ions|ions]] through transporters, the other class of membrane transport proteins, is mediated in contrast to channel proteins either actively or passively&nbsp;<ref>(Molecular Biology Of The Cell, Alberts, et al., 2008, 653)</ref>.&nbsp;<br>
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Channel proteins; these are one of the two classes of membrane transport [[Proteins|proteins.]] These proteins span the entire membrane, they are transmembranal, water-filled pores that allow specific water-soluble ions to pass. They only allow specific solutes to passively traverse [[Lipid bilayer|lipid bilayers]] through an [[Aqueous pore|aqueous pore]] due to the specific size of the ion selectivity filter; the narrowest part of the channel protein only allows specifically charged and sized molecules to pass through<ref>BiologyWise. A Face-off between carrier proteins vs. channel proteins. 2017. [cited 18/11/18]; Available from https://biologywise.com/carrier-proteins-vs-channel-proteins</ref>. For example the [http://en.m.wikipedia.org/wiki/Potassium_leak_channel potassium leak channels] will only allow [[Potassium|potassium]] to travel through them. Most solutes that pass through channel proteins have a specified [[Molecular weight|molecular weight]] and charge and are inorganic ions. The concentration and electrical gradients of charged ions determine the direction of flow of the ions and also the rate through the membrane; they move from an area of high to low concentration in processes known as either [[Passive transport|passive transport]] or [[Facilitated diffusion|facilitated diffusion]]. The movement of [[Ions|ions]] through transporters, the other class of membrane transport proteins, is mediated in contrast to channel proteins either actively or passively<ref>(Molecular Biology Of The Cell, Alberts, et al., 2008, 653)</ref>.  
  
 
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=== References  ===
  
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Latest revision as of 16:41, 7 December 2018

Channel proteins; these are one of the two classes of membrane transport proteins. These proteins span the entire membrane, they are transmembranal, water-filled pores that allow specific water-soluble ions to pass. They only allow specific solutes to passively traverse lipid bilayers through an aqueous pore due to the specific size of the ion selectivity filter; the narrowest part of the channel protein only allows specifically charged and sized molecules to pass through[1]. For example the potassium leak channels will only allow potassium to travel through them. Most solutes that pass through channel proteins have a specified molecular weight and charge and are inorganic ions. The concentration and electrical gradients of charged ions determine the direction of flow of the ions and also the rate through the membrane; they move from an area of high to low concentration in processes known as either passive transport or facilitated diffusion. The movement of ions through transporters, the other class of membrane transport proteins, is mediated in contrast to channel proteins either actively or passively[2].

References

  1. BiologyWise. A Face-off between carrier proteins vs. channel proteins. 2017. [cited 18/11/18]; Available from https://biologywise.com/carrier-proteins-vs-channel-proteins
  2. (Molecular Biology Of The Cell, Alberts, et al., 2008, 653)

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