Source 1primary paper2008Proceedings of the National Academy of Sciences
Toolkit/alpha-helical domain linker
alpha-helical domain linker
Also known as: helical "allosteric lever arm"
Taxonomy: Mechanism Branch / Architecture. Workflows sit above the mechanism and technique branches rather than replacing them.
Summary
The alpha-helical domain linker is a construct pattern in which a rigid alpha-helical segment is placed between fused protein domains to couple their functions. In the cited design context, it is proposed to act as a helical allosteric lever arm that transmits conformational information between domains.
Usefulness & Problems
Why this is useful
This construct pattern is useful for engineering communication between fused protein functions when a geometrically defined, rigid connection is desired. The cited source specifically supports its use as a conduit for allosteric signals in designed multidomain proteins.
Problem solved
It addresses the protein engineering problem of how to couple two protein domains so that a conformational change in one domain can influence the function of the other. The source frames the alpha-helical linker as a general scheme for transmitting allosteric signals across a fusion junction.
Problem links
A rigid helical linker is at least an actionable construct pattern for transmitting geometry between fused protein domains, which could matter in engineered protein assemblies that need controlled relative positioning. The evidence provided does not show use for nanoscale fabrication or direct positional chemistry, so this is only a weak, enabling link.
Taxonomy & Function
Primary hierarchy
Mechanism Branch
Architecture: A reusable architecture pattern for arranging parts into an engineered system.
Techniques
Computational DesignTarget processes
No target processes tagged yet.
Implementation Constraints
cofactor dependency: cofactor requirement unknownencoding mode: genetically encodedimplementation constraint: context specific validationoperating role: actuatorswitch architecture: uncaging
The supported implementation feature is the use of an alpha-helical linker with rigidity and defined geometry between fused protein domains. The supplied evidence does not specify linker sequence, length, host system, cofactors, or delivery considerations.
The available evidence is limited to a single design-principle statement and a brief mechanistic rationale from one 2008 study. Quantitative performance, sequence design rules, domain compatibility limits, and breadth of validation across multiple protein pairs are not provided in the supplied evidence.
Validation
Cell-freeBacteriaMammalianMouseHumanTherapeuticIndep. Replication
Supporting Sources
Ranked Claims
The ready success of the rational design strategy suggests that a helical allosteric lever arm is a general scheme for coupling the function of two proteins.
The ready success of our rational design strategy suggests that the helical "allosteric lever arm" is a general scheme for coupling the function of two proteins.
The ready success of the rational design strategy suggests that a helical allosteric lever arm is a general scheme for coupling the function of two proteins.
The ready success of our rational design strategy suggests that the helical "allosteric lever arm" is a general scheme for coupling the function of two proteins.
The ready success of the rational design strategy suggests that a helical allosteric lever arm is a general scheme for coupling the function of two proteins.
The ready success of our rational design strategy suggests that the helical "allosteric lever arm" is a general scheme for coupling the function of two proteins.
The ready success of the rational design strategy suggests that a helical allosteric lever arm is a general scheme for coupling the function of two proteins.
The ready success of our rational design strategy suggests that the helical "allosteric lever arm" is a general scheme for coupling the function of two proteins.
The ready success of the rational design strategy suggests that a helical allosteric lever arm is a general scheme for coupling the function of two proteins.
The ready success of our rational design strategy suggests that the helical "allosteric lever arm" is a general scheme for coupling the function of two proteins.
The ready success of the rational design strategy suggests that a helical allosteric lever arm is a general scheme for coupling the function of two proteins.
The ready success of our rational design strategy suggests that the helical "allosteric lever arm" is a general scheme for coupling the function of two proteins.
The ready success of the rational design strategy suggests that a helical allosteric lever arm is a general scheme for coupling the function of two proteins.
The ready success of our rational design strategy suggests that the helical "allosteric lever arm" is a general scheme for coupling the function of two proteins.
Approval Evidence
1 source1 linked approval claimfirst-pass slug alpha-helical-domain-linker
the rigidity and defined geometry of an alpha-helical domain linker would make it effective as a conduit for allosteric signals
Source:
design principlesupports
The ready success of the rational design strategy suggests that a helical allosteric lever arm is a general scheme for coupling the function of two proteins.
The ready success of our rational design strategy suggests that the helical "allosteric lever arm" is a general scheme for coupling the function of two proteins.
Source:
Comparisons
Source-backed strengths
The cited rationale is that the rigidity and defined geometry of an alpha-helical domain linker make it effective for allosteric signal transmission. The source further states that the success of a rational design strategy suggests this helical allosteric lever arm could be a general coupling scheme for two proteins.
Compared with KnChR
alpha-helical domain linker and KnChR address a similar problem space.
Shared frame: same top-level item type; shared mechanisms: conformational_uncaging
Strengths here: looks easier to implement in practice; may avoid an exogenous cofactor requirement.
Compared with SPACECAT
alpha-helical domain linker and SPACECAT address a similar problem space.
Shared frame: same top-level item type; shared mechanisms: conformational_uncaging
Strengths here: looks easier to implement in practice.
alpha-helical domain linker and tetraphenylethylene self-assembled monolayer mechano-optoelectronic molecular switch address a similar problem space.
Shared frame: same top-level item type; shared mechanisms: conformational_uncaging
Ranked Citations
- 1.