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Related Concept Videos

Mismatch Repair01:20

Mismatch Repair

Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
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The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
Mismatch Repair01:36

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Protein Complexes with Interchangeable Parts01:57

Protein Complexes with Interchangeable Parts

Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
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Protein Complexes with Interchangeable Parts01:57

Protein Complexes with Interchangeable Parts

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The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order to...
Point and Frameshift Mutations01:30

Point and Frameshift Mutations

Point mutations are genetic alterations involving the change of a single nucleotide base pair in DNA. Depending on how the alteration affects protein synthesis, they can lead to various consequences.Point mutations fall into the following types:Silent mutations occur when a nucleotide change does not alter the amino acid sequence due to the redundancy of the genetic code. For instance, changing ACC to ACA still encodes threonine, leaving the protein function unaffected. This occurs because...
Mutations01:39

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Updated: Jun 17, 2026

Stability and Structure of Bat Major Histocompatibility Complex Class I with Heterologous β2-Microglobulin
11:17

Stability and Structure of Bat Major Histocompatibility Complex Class I with Heterologous β2-Microglobulin

Published on: March 10, 2021

Mcl-1-Bim complexes accommodate surprising point mutations via minor structural changes.

Emiko Fire1, Stefano V Gullá, Robert A Grant

  • 1Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

Protein Science : a Publication of the Protein Society
|January 13, 2010
PubMed
Summary
This summary is machine-generated.

Mcl-1 protein structure reveals flexibility in its binding groove, accommodating mutations in Bim BH3 peptides. This adaptability is key for Mcl-1

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Area of Science:

  • Structural biology
  • Molecular interactions
  • Cancer biology

Background:

  • Mcl-1 is an anti-apoptotic protein crucial for cell survival, belonging to the Bcl-2 family.
  • Its function involves binding pro-apoptotic proteins via a surface groove, with specificity arising from groove variations.
  • Mcl-1 and related proteins are significant therapeutic targets in cancer treatment.

Purpose of the Study:

  • To elucidate the structural basis of Mcl-1's binding specificity.
  • To investigate Mcl-1's structural adaptability in response to mutations in its binding partners.
  • To provide insights for designing targeted Mcl-1 inhibitors.

Main Methods:

  • Determined the crystal structure of human Mcl-1 bound to a Bim BH3 peptide.
  • Analyzed structures of Mcl-1 complexes with mutated Bim BH3 peptides.
  • Surveyed structural variations in Mcl-1 and Bcl-x(L) complexes.

Main Results:

  • Mcl-1 exhibits structural flexibility, accommodating significant physicochemical changes in the Bim BH3 peptide.
  • Observed modest effects of mutations on complex stability, with Mcl-1 undergoing minor structural adjustments.
  • Identified specific side-chain and helix shifts in Mcl-1 to accommodate mutant ligands.

Conclusions:

  • Mcl-1's moderate structural flexibility is critical for interacting with diverse BH3-only proteins.
  • Understanding Mcl-1's adaptability aids in comprehending Bcl-2 family protein function and specificity.
  • These structural insights can guide the development of novel Mcl-1-targeting cancer therapies.