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Updated: Feb 17, 2026

Measurement of Heme Synthesis Levels in Mammalian Cells

Measurement of Heme Synthesis Levels in Mammalian Cells

Published on: July 9, 2015

Molluscan hemocyanin: structure, evolution, and physiology.

Sanae Kato¹, Takashi Matsui², Christos Gatsogiannis³

¹Faculty of Fisheries, Kagoshima University, 4-50-20 Shimoarata, Kagoshima, 890-0056, Japan. kato@fish.kagoshima-u.ac.jp.

Biophysical Reviews

|December 14, 2017

Summary

Molluscs have blue blood due to hemocyanin, a large copper-binding protein. This review details hemocyanin

Keywords:

Electron cryo-microscopy Evolution Glycoprotein Molluscan hemocyanin Oxygen transporter Structure X-ray crystallography

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A Method for Extracting Pigments from Squid Doryteuthis pealeii

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Published on: November 9, 2016

Area of Science:

Biochemistry
Structural Biology
Molecular Biology

Background:

Molluscs possess blue blood owing to hemocyanin, a copper-binding protein responsible for oxygen transport.
Molluscan hemocyanins are exceptionally large, multimeric glycoproteins found dissolved in hemolymph, with masses up to 13.5 MDa.
These proteins assemble into complex structures, including decamers and multi-decamers, from smaller subunits.

Purpose of the Study:

To provide a comprehensive review of molluscan hemocyanin, focusing on its molecular and structural characteristics.
To elucidate the structure of the functional unit and the architecture of the large multimeric hemocyanin complex.
To discuss the evolutionary implications and physiological significance of molluscan hemocyanin.

Main Methods:

Utilized single particle electron cryo-microscopy for analyzing the overall structure of hemocyanin.
Employed high-resolution X-ray crystallography for detailed structural investigation of the functional unit.
Reviewed existing literature on hemocyanin structure and function, with a specific mention of squid hemocyanin's complete crystal structure.

Main Results:

Described the molecular characteristics of molluscan hemocyanin, emphasizing its structural features.
Detailed the organization of functional domains and their assembly into decamers, di-decamers, and tri-decamers.
Introduced the relationship between functional unit composition, tertiary structure, and the potential roles of associated carbohydrates.

Conclusions:

Molluscan hemocyanin represents one of the largest known protein structures, with intricate assembly and functional units.
Structural insights reveal key aspects of its evolutionary trajectory and physiological importance in molluscs.
Further research into carbohydrate functions and detailed structural variations can enhance our understanding.