1rh9

Family GH5 endo-beta-mannanase from Lycopersicon esculentum (tomato)Family GH5 endo-beta-mannanase from Lycopersicon esculentum (tomato)

Structural highlights

1rh9 is a 1 chain structure with sequence from Solanum lycopersicum. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	X-ray diffraction, Resolution 1.5Å
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

MAN4_SOLLC Possesses endo-beta-mannanase and mannan transglycosylase activities. May be involved in cell wall degradation during fruit ripening.^[1] ^[2]

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

The three-dimensional crystal structure of tomato (Lycopersicon esculentum) beta-mannanase 4a (LeMAN4a) has been determined to 1.5 A resolution. The enzyme adopts the (beta/alpha)(8) fold common to the members of glycohydrolase family GH5. The structure is comparable with those of the homologous Trichoderma reesei and Thermomonospora fusca beta-mannanases: There is a conserved three-stranded beta-sheet located near the N terminus that stacks against the central beta-barrel at the end opposite the active site. Three noncanonical beta-helices surround the active site. Similar helices are found in T. reesei but not T. fusca beta-mannanase. By analogy with other beta-mannanases, the catalytic acid/base residue is E204 and the nucleophile residue is E318. The active site cleft of L. esculentum beta-mannanase most closely resembles that of the T. reesei isozyme. A model of substrate binding in LeMAN4a is proposed in which the mannosyl residue occupying the -1 subsite of the enzyme adopts the (1)S(5) skew-boat conformation.

Three-dimensional structure of (1,4)-beta-D-mannan mannanohydrolase from tomato fruit.,Bourgault R, Oakley AJ, Bewley JD, Wilce MC Protein Sci. 2005 May;14(5):1233-41. PMID:15840830^[3]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Bourgault R, Bewley JD. Variation in its C-terminal amino acids determines whether endo-beta-mannanase is active or inactive in ripening tomato fruits of different cultivars. Plant Physiol. 2002 Nov;130(3):1254-62. PMID:12427992 doi:http://dx.doi.org/10.1104/pp.011890
↑ Schroder R, Wegrzyn TF, Sharma NN, Atkinson RG. LeMAN4 endo-beta-mannanase from ripe tomato fruit can act as a mannan transglycosylase or hydrolase. Planta. 2006 Oct;224(5):1091-102. Epub 2006 Apr 29. PMID:16649044 doi:http://dx.doi.org/10.1007/s00425-006-0286-0
↑ Bourgault R, Oakley AJ, Bewley JD, Wilce MC. Three-dimensional structure of (1,4)-beta-D-mannan mannanohydrolase from tomato fruit. Protein Sci. 2005 May;14(5):1233-41. PMID:15840830 doi:14/5/1233

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OCA

[1] Bourgault R, Bewley JD. Variation in its C-terminal amino acids determines whether endo-beta-mannanase is active or inactive in ripening tomato fruits of different cultivars. Plant Physiol. 2002 Nov;130(3):1254-62. PMID:12427992 doi:http://dx.doi.org/10.1104/pp.011890

[2] Schroder R, Wegrzyn TF, Sharma NN, Atkinson RG. LeMAN4 endo-beta-mannanase from ripe tomato fruit can act as a mannan transglycosylase or hydrolase. Planta. 2006 Oct;224(5):1091-102. Epub 2006 Apr 29. PMID:16649044 doi:http://dx.doi.org/10.1007/s00425-006-0286-0

[3] Bourgault R, Oakley AJ, Bewley JD, Wilce MC. Three-dimensional structure of (1,4)-beta-D-mannan mannanohydrolase from tomato fruit. Protein Sci. 2005 May;14(5):1233-41. PMID:15840830 doi:14/5/1233

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