cell length medium

Edge evidence

• moderate growth rate feeds into growth-rate size law

  Moderate exponential growth rates engage the growth-rate size law.

  • DOI:10.1126/science.aaa1313 cell size scales with growth rate Supports growth rate as the input to the size-scaling relationship.
• growth-rate size law produces cell length medium METPO:2000202

  At moderate growth rates the size law produces medium cell length.

  • DOI:10.1126/science.aaa1313 cell size scales with growth rate Supports medium length as the expected size at moderate growth rates.
• cell length medium is a cell length rdfs:subClassOf

  Medium cell length is a quantitative bin of the cell-length phenotype.

  • DOI:10.1016/j.cub.2014.07.022 cell size is tightly controlled Supports medium length as a value within the regulated cell-length distribution.
• RodA-PBP2 complex enables peptidoglycan insertion during elongation RO:0002327

  RodA glycosyltransferase and PBP2 transpeptidase together enable peptidoglycan insertion that drives elongation.

  • DOI:10.1002/mbo3.1385 RodA is a glycosyltransferase and PBP2 a transpeptidase required for cell elongation; Rod-complex rotation supports even PG insertion along the cylinder (broadly curatable general rod-bacterium mechanism).
• MreC/MreD balance modulates PBP2 transpeptidase activity RO:0002211

  The balance between MreC and MreD modulates PBP2, the essential elongation transpeptidase.

  • DOI:10.1002/mbo3.1385 "the balance between MreC and MreD modulates PBP2 activity" - mechanistic edge for elongation control.
• Rod complex (elongasome) increases peptidoglycan density / mechanical strength RO:0002213

  An intact Rod complex builds dense peptidoglycan; loss yields PG with large holes and reduced mechanical strength.

  • DOI:10.1002/mbo3.1385 "The Rod complex may be a determinant not only for the whole shape of peptidoglycan but also for its highly dense structure."
• peptidoglycan density / mechanical strength maintains rod shape

  Dense peptidoglycan produced by the elongation machinery maintains rod shape, the morphology context for medium cell length.

  • DOI:10.1002/mbo3.1385 "PG determines bacterial cell shape" - elongation machinery and dense PG determine whole-cell rod shape.
• membrane synthesis balances with PG synthesis to maintain PG-membrane envelope balance

  Balanced membrane and peptidoglycan synthesis is critical; reducing membrane synthesis restores balance when PG capacity is limited.

  • DOI:10.1128/mbio.00475-23 "Balanced synthesis of the peptidoglycan cell wall and the cell membrane is critical" - broader envelope-balance mechanism affecting elongation and shape.