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Related Concept Videos

Structural Protein Function01:56

Structural Protein Function

Structural proteins are a category of proteins responsible for functions ranging from cell shape and movement to providing support to major structures such as bones, cartilage, hair, and muscles. This group includes proteins such as collagen, actin, myosin, and keratin.
Collagen, the most abundant protein in mammals, is found throughout the body. In connective tissue, such as skin, ligaments, and tendons, it provides tensile strength and elasticity.  In bones and teeth, it mineralizes to form...
Structural Protein Function01:56

Structural Protein Function

Structural proteins are a category of proteins responsible for functions ranging from cell shape and movement to providing support to major structures such as bones, cartilage, hair, and muscles. This group includes proteins such as collagen, actin, myosin, and keratin.
Collagen, the most abundant protein in mammals, is found throughout the body. In connective tissue, such as skin, ligaments, and tendons, it provides tensile strength and elasticity.  In bones and teeth, it mineralizes to form...
Inducible Operons: lac Operon01:25

Inducible Operons: lac Operon

The lac operon in Escherichia coli is a model for understanding inducible gene regulation and metabolic flexibility. It integrates local control by lactose and global regulation through catabolite repression, enabling E. coli to preferentially metabolize glucose when available and switch to lactose utilization when glucose is scarce.Structure and Function of the lac OperonThe lac operon contains three structural genes: lacZ (β-galactosidase), lacY (lactose permease), and lacA (thiogalactoside...
The Early Endosome: Endocytosis of Transferrin01:28

The Early Endosome: Endocytosis of Transferrin

Essential proteins such as insulin or low-density lipoprotein (LDL) and micronutrients such as iron enter a eukaryotic cell through receptor-mediated endocytosis. Subsequently, the early endosomes fuse with the vesicles containing such receptor-ligand complexes and play a vital role in sorting the incoming ligands and receptors. While the ligands are either degraded inside the vesicle or released into the cytosol, their receptors are returned to the plasma membrane for further rounds of...
Operons02:09

Operons

Prokaryotes can control gene expression through operons—DNA sequences consisting of regulatory elements and clustered, functionally related protein-coding genes. Operons use a single promoter sequence to initiate transcription of a gene cluster (i.e., a group of structural genes) into a single mRNA molecule. The terminator sequence ends transcription. An operator sequence, located between the promoter and structural genes, prohibits the operon’s transcriptional activity if bound by a repressor...
Operon Model01:23

Operon Model

The operon model represents a fundamental mechanism of gene regulation in prokaryotes, enabling coordinated expression of genes involved in related metabolic or functional pathways. Operons consist of structural genes, a promoter, and an operator, with transcription regulated by repressors, activators, and small effector molecules.Structure and Function of OperonsAn operon is a cluster of structural genes transcribed together under the control of a single promoter. The promoter region...

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Related Experiment Video

Updated: May 25, 2026

Immunofluorescence to Monitor the Cellular Uptake of Human Lactoferrin and its Associated Antiviral Activity Against the Hepatitis C Virus
06:28

Immunofluorescence to Monitor the Cellular Uptake of Human Lactoferrin and its Associated Antiviral Activity Against the Hepatitis C Virus

Published on: October 1, 2015

A structural perspective on lactoferrin function.

Heather M Baker1, Edward N Baker

  • 1School of Biological Sciences, University of Auckland, Private Bag 92019, Auckland, New Zealand.

Biochemistry and Cell Biology = Biochimie Et Biologie Cellulaire
|February 2, 2012
PubMed
Summary
This summary is machine-generated.

Human lactoferrin

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Immunology

Background:

  • Human lactoferrin's 3-D structure was determined in atomic detail in 1987.
  • Numerous functions beyond iron-binding have been proposed for lactoferrin.
  • Structural studies now encompass various forms (apo, iron-bound), mutants, and species.

Purpose of the Study:

  • To review current structural and functional information on human lactoferrin.
  • To demonstrate how 3-D structure aids understanding of lactoferrin's activities.
  • To identify research directions for elucidating lactoferrin's functions.

Main Methods:

  • Review of existing structural data (X-ray crystallography, etc.).
  • Analysis of structure-function relationships.
  • Focus on surface features and their role in protein activity.

Main Results:

  • The 3-D structure of lactoferrin serves as a framework for understanding its functions.
  • Lactoferrin scavenges and retains iron across a wide pH range.
  • Specific surface structural features are linked to lactoferrin's protective properties.

Conclusions:

  • Structural insights are crucial for understanding lactoferrin's diverse roles.
  • Further research into surface structure can reveal more about its protective functions.
  • Lactoferrin is a multifunctional protein with significant biological relevance.