Bacterial chromosomal DNA replication

Reusable bacterial chromosome-replication module spanning origin initiation, fork unwinding and single-strand protection, RNA priming, DNA polymerase III synthesis and proofreading, sliding-clamp processivity, clamp loading, and Okazaki-fragment ligation. Verified Pseudomonas putida and Escherichia coli exemplars ground the conserved activities and complexes without restricting the module to either species.

MODULE:bacterial_chromosomal_dna_replicationDRAFTCONCRETEBiological Processmodules/bacterial_chromosomal_dna_replication.yaml
DNA replicationGO:0006260
GO:0006260
DNA replication
Grounds chromosome duplication by the bacterial replisome.
KEGG:ppu03030
Pseudomonas putida KT2440 DNA replication
Identifies the PSEPK replisome realization.
file:projects/P_PUTIDA/deep-research/PSEPK__bacterial_chromosomal_dna_replication__ppu03030-deep-research-openscientist.md
OpenScientist PSEPK chromosomal DNA-replication pathway review
The species-aware report finds all seven modeled parts satisfiable, supports HolA, HolB, and HolC in the DnaX-containing clamp loader, and distinguishes three non-core exonuclease/helicase candidates from the authentic replisome.

The module models the conserved chromosome-replication mechanism rather than every protein in the broad KEGG map. DNA polymerase I gap filling, RNase H, repair exonucleases, and DNA ligase B are adjacent replication/repair activities outside the focused replisome realization. Molecular functions are attached only to leaf annotons. The loader's psi assignment at PP_0978 and the presence or absence of a theta subunit remain uncertain and are not asserted as exact exemplars. OpenScientist proposed PP_1552 as a DnaC helicase loader, but current UniProt and local metadata instead identify Q88ML9 as an unnamed phage replication protein; no exact DnaC, DnaI, or DciA exemplar is therefore asserted.

8Nodes
7Parts
0Variant Sets
0Variants
12Annotons
6Connections

Derived QC

Recommended-field compliance

100.0% recommended fields populated

All recommended fields populated.

Module deep research

✗ none found

No MODULE:bacterial_chromosomal_dna_replication deep-research report alongside the module YAML.

Leaf nodes lacking representative members

✓ every leaf node grounds to a representative protein.

Template conformance

✓ every declared conforms_to bundle matches its template motif.

Reaction chaining (advisory)

✓ every PRECEDES step chains, or its break is acknowledged via chaining_status.

  • dnaa_origin_initiation → fork_unwinding_protection [NOT_CHECKED]
  • fork_unwinding_protection → dnag_priming [NOT_CHECKED]
  • poliii_core_synthesis → liga_nick_sealing [NOT_CHECKED]

Gene-review completeness (9/24 grounded genes reviewed)

8 complete review(s) · 0 with deep research · 15 missing review · 9 reviewed but lacking deep research

Gene Review Complete Deep research
dnaA P0A116 ✓ ✓ ✗
dnaB Q88DF2 ✓ ✓ ✗
dnaEA Q88MG5 ✓ 7/8 ✗
dnaG P0A118 ✓ ✓ ✗
dnaN P0A120 ✓ ✓ ✗
dnaQ Q88FF6 ✓ ✓ ✗
dnaX Q88F30 ✓ ✓ ✗
ligA Q88F25 ✓ ✓ ✗
Escherichia coli DnaA exemplar P03004 ✗ — —
Escherichia coli DnaQ exemplar P03007 ✗ — —
Escherichia coli DnaX exemplar P06710 ✗ — —
Escherichia coli DnaN exemplar P0A988 ✗ — —
Escherichia coli DnaG exemplar P0ABS5 ✗ — —
Escherichia coli DnaB exemplar P0ACB0 ✗ — —
Escherichia coli SSB exemplar P0AGE0 ✗ — —
Escherichia coli DnaE exemplar P10443 ✗ — —
Escherichia coli LigA exemplar P15042 ✗ — —
Escherichia coli HolA exemplar P28630 ✗ — —
Escherichia coli HolB exemplar P28631 ✗ — —
Escherichia coli HolC exemplar P28905 ✗ — —
PSEPK HolA exemplar Q88DM9 ✗ — —
PSEPK HolB exemplar Q88LG7 ✗ — —
PSEPK HolC exemplar Q88P74 ✗ — —
ssb Q88QK5 ✓ ✓ ✗

Details

Context
bacteriaNCBITaxon:2
Bacterial chromosomal DNA replicationBiological Processbacterial_chromosomal_dna_replication
DNA replicationGO:0006260
Context
bacteriaNCBITaxon:2

Connections

Part 1: replication initiation at the chromosomal origin
DnaA-dependent origin openingRegulatory Stepdnaa_origin_initiation

Annotons

DnaA replication initiator
dnaa_initiator
Participant: Family: bacterial DnaA family
Family:
bacterial DnaA familyPANTHER:PTHR30050:SF2
Representative Members: PSEPK DnaA exemplarUniProtKB:P0A116 Escherichia coli DnaA exemplarUniProtKB:P03004

Function

DNA replication origin bindingGO:0003688

Recognizes the chromosomal origin and promotes local duplex opening.

Part 2: fork unwinding and single-strand protection
DnaB helicase and SSB expose and protect templatesBiological Processfork_unwinding_protection

Annotons

DnaB replicative helicase
dnab_helicase
Participant: Family: bacterial DnaB helicase family
Family:
bacterial DnaB helicase familyPANTHER:PTHR30153:SF2
Representative Members: PSEPK DnaB exemplarUniProtKB:Q88DF2 Escherichia coli DnaB exemplarUniProtKB:P0ACB0

Function

5'-3' DNA helicase activityGO:0043139

Unwinds parental duplex DNA at the replication fork.

SSB single-strand protection
ssb_template_protection
Participant: Family: bacterial single-stranded DNA-binding protein family
Family:
bacterial single-stranded DNA-binding protein familyPANTHER:PTHR10302:SF27
Representative Members: PSEPK SSB exemplarUniProtKB:Q88QK5 Escherichia coli SSB exemplarUniProtKB:P0AGE0

Function

single-stranded DNA bindingGO:0003697

Coats exposed single-stranded templates and prevents secondary structure.

Part 3: RNA primer synthesis
DnaG primer synthesisReactiondnag_priming

Annotons

DnaG primase
dnag_primase
Participant: Family: bacterial DnaG primase family
Family:
bacterial DnaG primase familyPANTHER:PTHR30313:SF2
Representative Members: PSEPK DnaG exemplarUniProtKB:P0A118 Escherichia coli DnaG exemplarUniProtKB:P0ABS5

Function

DNA-directed RNA polymerase activityGO:0003899

Synthesizes RNA primers for leading- and lagging-strand DNA synthesis.

Part 4: processive DNA synthesis and proofreading
DNA polymerase III alpha-epsilon coreProtein Complexpoliii_core_synthesis

Annotons

DNA polymerase III alpha subunit
dnaea_polymerase
Participant: Family: bacterial DNA polymerase III alpha family
Family:
bacterial DNA polymerase III alpha familyPANTHER:PTHR32294:SF0
Representative Members: PSEPK DnaE alpha exemplarUniProtKB:Q88MG5 Escherichia coli DnaE exemplarUniProtKB:P10443

Function

DNA-directed DNA polymerase activityGO:0003887

Extends DNA primers using the template strand.

DNA polymerase III epsilon subunit
dnaq_proofreading
Participant: Family: bacterial DnaQ proofreading exonuclease family
Family:
bacterial DnaQ proofreading exonuclease familyPANTHER:PTHR30231:SF41
Representative Members: PSEPK DnaQ exemplarUniProtKB:Q88FF6 Escherichia coli DnaQ exemplarUniProtKB:P03007

Function

3'-5' exonuclease activityGO:0008408

Proofreads newly synthesized DNA within the polymerase III core.

Part 5: clamp loading and replisome coupling
DnaX-containing clamp-loader complexProtein Complexclamp_loader_activity

Annotons

DnaX tau/gamma clamp-loader ATPase contribution
dnax_clamp_loader
Participant: Family: bacterial DnaX clamp-loader family
Family:
bacterial DnaX clamp-loader family
Representative Members: PSEPK DnaX exemplarUniProtKB:Q88F30 Escherichia coli DnaX exemplarUniProtKB:P06710

Function

contributes to DNA clamp loader activityGO:0003689

Supplies the gamma/tau ATPase contribution to the multisubunit clamp loader; DnaX alone is not asserted to perform complete clamp loading.

HolA delta clamp-loader subunit
hola_clamp_loader_delta
Participant: Family: bacterial HolA delta family
Family:
bacterial HolA delta familyPANTHER:PTHR34388:SF1
Representative Members: PSEPK HolA exemplarUniProtKB:Q88DM9 Escherichia coli HolA exemplarUniProtKB:P28630

Opens and positions the beta clamp within the multisubunit loader.

HolB delta-prime clamp-loader subunit
holb_clamp_loader_delta_prime
Participant: Family: bacterial HolB delta-prime family
Family:
bacterial HolB delta-prime familyPANTHER:PTHR11669:SF8
Representative Members: PSEPK HolB exemplarUniProtKB:Q88LG7 Escherichia coli HolB exemplarUniProtKB:P28631

Provides a structural clamp-loader subunit that associates with DnaX and HolA.

HolC chi clamp-loader subunit
holc_clamp_loader_chi
Participant: Family: bacterial HolC chi family
Family:
bacterial HolC chi familyPANTHER:PTHR38767:SF1
Representative Members: PSEPK HolC exemplarUniProtKB:Q88P74 Escherichia coli HolC exemplarUniProtKB:P28905

Connects the clamp-loader assembly to single-stranded DNA-binding protein interactions.

Part 6: sliding-clamp processivity
DnaN beta sliding clampProtein Complexbeta_clamp_processivity

Annotons

DnaN beta clamp
dnan_sliding_clamp
Participant: Family: bacterial DNA polymerase III beta-clamp family
Family:
bacterial DNA polymerase III beta-clamp familyPANTHER:PTHR30478:SF0
Representative Members: PSEPK DnaN exemplarUniProtKB:P0A120 Escherichia coli DnaN exemplarUniProtKB:P0A988

Function

DNA polymerase processivity factor activityGO:0030337

Encircles DNA and tethers polymerase for processive synthesis.

Part 7: Okazaki-fragment nick sealing
LigA-dependent DNA ligationReactionliga_nick_sealing

Annotons

NAD-dependent DNA ligase LigA
liga_activity
Participant: Family: bacterial NAD-dependent DNA ligase family
Family:
bacterial NAD-dependent DNA ligase familyPANTHER:PTHR23389:SF9
Representative Members: PSEPK LigA exemplarUniProtKB:Q88F25 Escherichia coli LigA exemplarUniProtKB:P15042

Function

DNA ligase (NAD+) activityGO:0003911

Seals remaining nicks after lagging-strand primer replacement.