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Mechanical Protein Functions

Mechanical Protein Functions

Proteins perform many mechanical functions in a cell. These proteins can be classified into two general categories- proteins that generate mechanical forces and proteins that are subjected to mechanical forces. Proteins providing mechanical support to the structure of the cell, such as keratin, are subjected to mechanical force, whereas proteins involved in cell movement and transport of molecules across cell membranes, such as an ion pump, are examples of generating mechanical force.

SN1 Reaction: Stereochemistry

S_N1 Reaction: Stereochemistry

This lesson provides an in-depth discussion of the stereochemical outcomes in an SN1 reaction.
In the first step of an SN1 reaction, the bond between the electrophilic carbon and the leaving group ionizes to generate the carbocation intermediate. The second step of the mechanism is the nucleophilic attack.
In the formed carbocation, the positively charged carbon is sp2 hybridized with a trigonal planar geometry. As all the three substituents lie on the same plane, a plane of symmetry for the...

SN1 Reaction: Kinetics

S_N1 Reaction: Kinetics

In an SN2 reaction, the reaction rate depends on both the type of nucleophile and the substrate. A hindered tertiary alkyl halide is practically inert to the SN2 mechanism despite using a strong nucleophile.
However, Sir Christopher Ingold and Edward D. Hughes, who studied the kinetics of various nucleophilic substitution reactions, noticed that a tertiary alkyl halide does undergo a nucleophilic substitution reaction in the presence of a weak nucleophile. While studying the substitution...

SN1 Reaction: Mechanism

S_N1 Reaction: Mechanism

Kinetic studies of ionization of a tertiary halide in a protic solvent suggest that only the substrate participates in the rate-determining step (slow step). The nucleophile is involved only after the slowest step. The SN1 reaction takes place in a multiple-step mechanism.
Firstly, the haloalkane ionizes to generate a carbocation intermediate and a halide ion. This heterolytic cleavage is highly endothermic with large activation energy. The ionization of the substrate, facilitated by a...

Acidity of 1-Alkynes

Acidity of 1-Alkynes

The acidic strength of hydrocarbons follows the order: Alkynes > Alkenes > Alkanes. The strength of an acid is commonly expressed in units of pKa — the lower the pKa, the stronger the acid. Among the hydrocarbons, terminal alkynes have lower pKa values and are, therefore, more acidic. For example, the pKa values for ethane, ethene, and acetylene are 51, 44, and 25, respectively, as shown here.

Functional Groups

Functional Groups

Functional groups are a group of atoms with characteristic properties, which when linked to the carbon skeleton of a molecule, alter the properties of that molecule. For example, the presence of certain functional groups on a molecule will make them hydrophilic, whereas others will make them hydrophobic. These functional groups are an indispensable part of organic chemistry and important components of biological molecules, such as carbohydrates, proteins, lipids, and nucleic acids. Each...

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Updated: Jan 23, 2026

Measurement of Chladni Mode Shapes with an Optical Lever Method

Measurement of Chladni Mode Shapes with an Optical Lever Method

Published on: June 5, 2020

シナプス小胞1型（Synaptotagmin-1）機能のレバーモデル

Josep Rizo^1,2,3, Yun-Zu Pan^1,2,3, Cyrus T Rastegar^1,2,3

¹Department of Biophysics, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.

Journal of cell science

|January 22, 2026

まとめ

カルシウムがシナプス小胞1型（神経伝達物質放出に不可欠なタンパク質）に結合すると、そのC2Bドメインが再配向し、SNARE複合体の操作を介した速い膜融合を誘発するレバーとして機能する。

キーワード:

コンプレキシン膜融合神経伝達物質放出 SNARE シナプス小胞1型

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関連する実験動画

Last Updated: Jan 23, 2026

Measurement of Chladni Mode Shapes with an Optical Lever Method

Measurement of Chladni Mode Shapes with an Optical Lever Method

Published on: June 5, 2020

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科学分野:

分子神経科学
細胞生物学
生物物理学

背景:

神経伝達物質放出は、シナプス小胞1型およびSNAREへのCa2+結合に依存する。
シナプス小胞1型の膜融合における役割は、C2ドメインの配向のために議論されている。
シナプス小胞1型C2BドメインのCa2+結合ループは、SNAREに結合したときに融合部位から離れる方向を向いている。

研究の目的:

神経伝達物質放出中のシナプス小胞1型C2Bドメインの配向に関するパラドックスを解決する。
シナプス小胞1型がSNARE媒介性膜融合をどのように促進するかを説明するモデルを提案する。

主な方法:

C2ドメインと融合部位近傍との影響を評価するための分子動力学シミュレーション。
Ca2+結合時のC2Bドメイン再配向を研究するための分光学的技術（EPR、NMR、蛍光）。
C2Bドメイン再配向の機能的重要性決定のための電気生理学的研究。

主要な成果:

Ca2+結合はシナプス小胞1型C2Bドメインの再配向を誘発する。
C2Bドメインは膜結合型SNARE複合体から部分的に解離することができる。
この再配向は、効率的な神経伝達物質放出に不可欠である。

結論:

シナプス小胞1型はレバーとして機能し、Ca2+誘発性のC2Bドメイン再配向がSNAREの構造変化を促進する。
この遠隔レバー作用が速い膜融合を誘発し、C2Bドメイン配向のパラドックスを説明する。
提案されたモデルは、構造的および機能的データを統合して、速い神経伝達物質放出のメカニズムを解明する。