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Introduction

Mycobacterium tuberculosis very-long-chain fatty acyl-CoA synthetase

Mycobacterium tuberculosis very-long-chain fatty acyl-CoA synthetase, also known as FadD13, is unique within its class in regards to its ability to house lipid substrates longer than itself. Most FadD class proteins exist as integral membrane proteins involved in lipid transport into the cell. FadD13 is unique structurally in that it exists as a peripheral protein on the inside of the cell membrane. This feature is key in the mechanistic basis for FadD13's transport of fatty acids of length C24-C26.

Mechanism

Structural basis for housing lipid substrates longer than the enzyme

Structure

General overview

FadD13 is composed of 503 amino acid residues divided into three main regions: The N-terminal domain (residues 1-395) and C-terminal domain (residues 402-503) which are connected via a flexible linker (residues 396-401).

Electrostatics

The electrostatics of FadD13 as seen in (figure...) illustrate the hydrophobic and positively charged regions that compose this protein. Experimental results from (Paper) revealed that the peripheral FadD13 attached to the membrane via positively charges interacting with the negatively charged cell membrane (image) located on the top portion of the N-terminal region.

Arginine Rich Lid-loop

Hydrophobic Tunnel

Active Site

Disease

Relevance

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