Bonding Structure of Peptidoglycan

Bacterial Cell Wall Structure 
Location and Amount of Peptidoglycan in Gram+ vs. Gram- Bacteria

CLASS NOTES from Science Prof Online

GEN BIOCELL BIOMICROBIOLOGYHOMESCHOOL SCIENCEINSTRUCTORSABOUT SPO



Peptidoglycan (pep-tid-o-gly-can) is a molecule found only in bacterial cell walls  The rigid structure of peptidoglycan gives the bacterial cell shape, surrounds the plasma membrane and provides prokaryotes 
with protection from the environment.


Article Summary: The amount and location of peptidoglycan in the prokaryotic cell wall is what determines whether a bacterium is Gram-positive or Gram-negative.
Bacterial Cell Wall Structure: Gram + & Gram -
Virtual Microbiology
Classroom






You have free access to a large collection of materials used in two college-level introductory microbiology courses (8-week & 16-week). The Virtual Microbiology Classroom provides a wide range of free educational resources including PowerPoint Lectures, Study Guides, Review Questions and Practice Test Questions.
Prokaryotic Cell, Mariana Ruiz
Gram Positive Stained Staphylococcus Bacteria @ 1000xTM
Gram-positive Staphylococcus. Thick peptidoglycan cell wall retains crystal violet primary Gram stain. Go to > 
More Gram Stain Photos
Gram positive cell wall structure
facebook link
SPO twitter
Tamislinked in page
Page last updated 5/2015

SPO VIRTUAL CLASSROOMS
Peptidoglycan is a huge polymer of interlocking chains composed of similar monomers. The backbone of the 
Instructor's Corner
The SPO website is best 
viewed in Microsoft Explorer, Google Chrome or Apple Safari.
Continued ... Go to PAGE 2 >
Bonding Structure of Peptidoglycan
Gram-positive Cells
In Gram-positive cells, peptidoglycan makes up as much as 90% of the thick, compact cell wall, which is the outermost structure of Gram + cells.

peptidoglycan molecule is composed of two derivatives of glucose: NAG & NAM. Strands of NAG (N-acetylglucosamine) and NAM (N- acetylmuramic acid) are connected by interpeptide bridges.


See Page 2 for a diagram of the Gram-negative cell wall and a video on Gram Staining!