GO_REF:0000002

Gene Ontology annotation through association of InterPro records with GO terms

CipA carries cohesin (IPR002102), CBM3 (IPR001956), and dockerin (IPR002105) InterPro signatures, which drive InterPro2GO inferences of cellulose binding and cellulosome localization. The scaffoldin itself is non-catalytic, so process-level inferences are indirect (it organizes catalytic dockerin-bearing enzymes).

GO_REF:0000043

Gene Ontology annotation based on UniProtKB/Swiss-Prot keyword mapping

UniProtKB keyword KW-0136 (Cellulose degradation) maps to GO:0030245 (cellulose catabolic process); applied to CipA by association with the cellulosome rather than direct catalysis.
UniProtKB keyword KW-0961 (Cell wall biogenesis/degradation) maps to GO:0071555 (cell wall organization); applied to CipA via its cellulosomal cell-surface scaffolding role rather than direct cell wall remodeling.

GO_REF:0000044

Gene Ontology annotation based on UniProtKB/Swiss-Prot Subcellular Location vocabulary mapping

UniProt Subcellular Location "Secreted" (SL-0243; with note "Remains at the cell surface") maps to GO:0005576 (extracellular region); for CipA the more specific GO:0043263 (cellulosome) reflects its role as the primary cellulosomal scaffoldin anchored to the cell surface via a type II dockerin-cohesin interaction.

GO_REF:0000120

Combined Automated Annotation using Multiple IEA Methods

Combined evidence sources (InterPro2GO signatures IPR002102/IPR002105/IPR016134/IPR036439 plus UniProtKB-KW:KW-0624) converge on GO:0000272 (polysaccharide catabolic process); for the non-catalytic CipA scaffoldin this reflects cellulosome association rather than direct catalysis.

PMID:14623971

Cellulosome assembly revealed by the crystal structure of the cohesin-dockerin complex

First crystal structure of type I cohesin-dockerin complex at 2.2 A resolution

"Here we report the structure of the cohesin-dockerin complex from Clostridium thermocellum at 2.2-A resolution."
Demonstrates structural basis for cellulosome assembly via cohesin-dockerin interaction

"This megadalton catalytic machine organizes an enzymatic consortium on a multifaceted molecular scaffold whose "cohesin" domains interact with corresponding "dockerin" domains of the enzymes."
Shows dockerin internal symmetry suggesting dual binding mode

"Significantly, internal sequence duplication within the dockerin is manifested in near-perfect internal twofold symmetry, suggesting that both "halves" of the dockerin may interact with cohesins in a similar manner"

PMID:16384918

Mechanism of bacterial cell-surface attachment revealed by the structure of cellulosomal type II cohesin-dockerin complex

Crystal structure of type II cohesin-dockerin complex with ultra-high affinity

"Here, we report the structure of an ultra-high-affinity (K(a) = 1.44 x 10(10) M(-1)) complex between type II Doc, together with its neighboring X module from the cellulosome scaffold of Clostridium thermocellum, and a type II Coh module associated with the bacterial cell surface."
X module enhances dockerin stability and cohesin recognition

"Identification of X module-Doc and X module-Coh contacts reveal roles for the X module in Doc stability and enhanced Coh recognition."

PMID:17360613

Evidence for a dual binding mode of dockerin modules to cohesins

Demonstrates dual binding mode imparts plasticity to cellulosome structure

"The dual binding mode is predicted to impart significant plasticity into the orientation of the catalytic subunits within this supramolecular assembly"

cipA-deep-research-falcon.md

Deep research summary of CipA function

Comprehensive literature synthesis confirms CipA is a non-catalytic scaffoldin

"CipA is a non-catalytic structural organizer that assembles multiple cellulases and hemicellulases into a multienzyme complex through high-affinity type I cohesin-dockerin interactions"