Characterization of insulin crystalline form in isolated beta-cell secretory granules

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14740%2F22%3A00128509" target="_blank" >RIV/00216224:14740/22:00128509 - isvavai.cz</a>

Výsledek na webu

<a href="https://royalsocietypublishing.org/doi/10.1098/rsob.220322" target="_blank" >https://royalsocietypublishing.org/doi/10.1098/rsob.220322</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1098/rsob.220322" target="_blank" >10.1098/rsob.220322</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Characterization of insulin crystalline form in isolated beta-cell secretory granules

Popis výsledku v původním jazyce

Insulin is stored in vivo inside the pancreatic beta-cell insulin secretory granules. In vitro studies have led to an assumption that high insulin and Zn2+ concentrations inside the pancreatic beta-cell insulin secretory granules should promote insulin crystalline state in the form of Zn2+-stabilized hexamers. Electron microscopic images of thin sections of the pancreatic beta-cells often show a dense, regular pattern core, suggesting the presence of insulin crystals. However, the structural features of the storage forms of insulin in native preparations of secretory granules are unknown, because of their small size, fragile character and difficult handling. We isolated and investigated the secretory granules from MIN6 cells under near-native conditions, using cryo-electron microscopic (Cryo-EM) techniques. The analysis of these data from multiple intra-granular crystals revealed two different rhomboidal crystal lattices. The minor lattice has unit cell parameters (a similar or equal to b similar or equal to 84.0 angstrom, c similar or equal to 35.2 angstrom), similar to in vitro crystallized human 4Zn(2+)-insulin hexamer, whereas the largely prevalent unit cell has more than double c-axis (a similar or equal to b similar or equal to c similar or equal to 96.5 angstrom) that probably corresponds to two or three insulin hexamers in the asymmetric unit. Our experimental data show that insulin can be present in pancreatic MIN6 cell granules in a microcrystalline form, probably consisting of 4Zn(2+)-hexamers of this hormone.

Název v anglickém jazyce

Characterization of insulin crystalline form in isolated beta-cell secretory granules

Popis výsledku anglicky

Insulin is stored in vivo inside the pancreatic beta-cell insulin secretory granules. In vitro studies have led to an assumption that high insulin and Zn2+ concentrations inside the pancreatic beta-cell insulin secretory granules should promote insulin crystalline state in the form of Zn2+-stabilized hexamers. Electron microscopic images of thin sections of the pancreatic beta-cells often show a dense, regular pattern core, suggesting the presence of insulin crystals. However, the structural features of the storage forms of insulin in native preparations of secretory granules are unknown, because of their small size, fragile character and difficult handling. We isolated and investigated the secretory granules from MIN6 cells under near-native conditions, using cryo-electron microscopic (Cryo-EM) techniques. The analysis of these data from multiple intra-granular crystals revealed two different rhomboidal crystal lattices. The minor lattice has unit cell parameters (a similar or equal to b similar or equal to 84.0 angstrom, c similar or equal to 35.2 angstrom), similar to in vitro crystallized human 4Zn(2+)-insulin hexamer, whereas the largely prevalent unit cell has more than double c-axis (a similar or equal to b similar or equal to c similar or equal to 96.5 angstrom) that probably corresponds to two or three insulin hexamers in the asymmetric unit. Our experimental data show that insulin can be present in pancreatic MIN6 cell granules in a microcrystalline form, probably consisting of 4Zn(2+)-hexamers of this hormone.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10608 - Biochemistry and molecular biology

Projekt

<a href="/cs/project/LM2018127" target="_blank" >LM2018127: Česká infrastruktura pro integrativní strukturní biologii</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Open Biology

ISSN

2046-2441

e-ISSN

—

Svazek periodika

12

Číslo periodika v rámci svazku

12

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

10

Strana od-do

220322

Kód UT WoS článku

000900974200003

EID výsledku v databázi Scopus

2-s2.0-85144273379