Startsida
Hjälp
Sök i LIBRIS databas

     

 

Sökning: onr:22571996 > Conformational Chan...

Conformational Changes during Potassium-Channel Gating / Jakob Renhorn

Renhorn, Jakob, 1981- (författare)
Elinder, Fredrik 1966- (preses)
Engblom, David 1975- (preses)
Pless, Stephan (opponent)
Linköpings universitet Institutionen för klinisk och experimentell medicin (utgivare)
Alternativt namn: IKE
Alternativt namn: Linköping University. Department of Clinical and Experimental Medicine
Alternativt namn: Linköping University. Faculty of Health Sciences. Department of Clinical and Experimental Medicine
Linköpings universitet Medicinska fakulteten (utgivare)
Publicerad: Linköping Department of Clinical and Experimental Medicine, Linköping University, 2018
Engelska 1 onlineresurs (69 sidor)
Serie: Linköping University Medical Dissertations, 0345-0082 ; 1614
Läs hela texten (Sammanfattning och ramberättelse från Linköping University Electronic Press)
Läs hela texten
Läs hela texten
  • E-bokAvhandling(Diss. (sammanfattning) Linköping : Linköpings universitet, 2018)
Sammanfattning Ämnesord
Stäng  
  • Voltage-gated ion channels have a paramount importance in many physiological processes such as cell-to-cell communication, action potential-propagation, and cell motility. Voltage-gated ion channels are characterized by their ability to sense membrane voltage and to greatly change channel activity in response to small changes in the voltage. The ability to sense voltage resides in the four voltage-sensor domains (VSDs) surrounding the central ion-conducting pore. Membrane depolarization causes the inside of the membrane to become positively charged, electrostatically repelling the positively charged fourth transmembrane segment (S4), or voltage sensor, in the VSD, causing the voltage sensor to move outwards. This motion provides necessary energy to open the pore and allow ion conductivity. Prolonged channel activation leads to alterations in the selectivity filter which cease ion conductivity, in a process called slow inactivation. In this thesis, we investigated the movement of S4 during activation of the channel. We also studied the communication between the four subunits during activation as well as the communication between the pore domain and VSD during slow inactivation. We have shown that voltage sensors move approximately 12 Å outwards during activation. The positively charged amino acid residues in S4 create temporary salt bridges with negative counter-charges in the other segments of the VSD as it moves through a membrane. We have also shown that the movement of one of the four voltage sensors can affect the movement of the neighboring voltage sensors. When at least one voltage sensor has moved to an up-position, it stabilizes other voltage sensors in the up-position, increasing the energy required for the voltage sensor to return to the down position. We have also shown reciprocal communication between the pore domain and the VSDs. Alterations in the VSD or the interface between the pore and the VSD cause changes in the rate of slow inactivation. Likewise, modifications in the pore domain cause changes to the voltage-sensor movement. This indicates communication between the pore and the VSD during slow inactivation. The information from our work could be used to find new approaches when designing channel-modifying drugs for the treatment of diseases caused by increased neuronal excitability, such as chronic pain and epilepsy. 

Ämnesord

Neurons  (MeSH)
Ion Channels  (MeSH)
Electrophysiology  (MeSH)
Medical and Health Sciences  (hsv)
Basic Medicine  (hsv)
Neurosciences  (hsv)
Medicin och hälsovetenskap  (hsv)
Medicinska och farmaceutiska grundvetenskaper  (hsv)
Neurovetenskaper  (hsv)

Indexterm och SAB-rubrik

ion-channel
electrophysiology
neuron
Jonkanal
neurologi
elektrofysiologi
neuron
aktionspotential

Klassifikation

573.8536 (DDC)
Ug.033 (kssb/8 (machine generated))
Inställningar Hjälp

Titeln finns på 1 bibliotek. 

Bibliotek i östra Sverige (1)

Ange som favorit
Om LIBRIS
Sekretess
Blogg
Hjälp
Fel i posten?
Kontakt
Teknik och format
Sök utifrån
Sökrutor
Plug-ins
Bookmarklet
Anpassa
Textstorlek
Kontrast
Vyer
LIBRIS söktjänster
SwePub
Sondera
Uppsök

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

Copyright © LIBRIS - Nationella bibliotekssystem

 
pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy