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1Wgy Lichtarge Lab 2006 Pages 1–4 1wgy Evolutionary trace report by report maker September 10, 2008 4.3.5 LaTex 4 4.3.6 Muscle 4 4.3.7 Pymol 4 4.4 Note about ET Viewer 4 4.5 Citing this work 4 4.6 About report maker 4 4.7 Attachments 4 1 INTRODUCTION From the original Protein Data Bank entry (PDB id 1wgy): Title: Ra domain of guanine nucleotide exchange factor for rap1 Compound: Mol id: 1; molecule: rap guanine nucleotide exchange factor 5; chain: a; fragment: ra domain; synonym: guanine nucleotide exchange factor for rap1, related to epac, repac, m-ras-regulated rap gef, mr-gef; engineered: yes Organism, scientific name: Homo Sapiens; 1wgy contains a single unique chain 1wgyA (104 residues long). This is an NMR-determined structure – in this report the first model in the file was used. CONTENTS 2 CHAIN 1WGYA 2.1 Q92565 overview 1 Introduction 1 From SwissProt, id Q92565, 100% identical to 1wgyA: 2 Chain 1wgyA 1 Description: Rap guanine nucleotide exchange factor 5 (Guanine 2.1 Q92565 overview 1 nucleotide exchange factor for Rap1) (Related to Epac) (Repac) 2.2 Multiple sequence alignment for 1wgyA 1 (M-Ras-regulated Rap GEF) (MR-GEF). 2.3 Residue ranking in 1wgyA 1 Organism, scientific name: Homo sapiens (Human). 2.4 Top ranking residues in 1wgyA and their position on Taxonomy: Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; the structure 1 Euteleostomi; Mammalia; Eutheria; Euarchontoglires; Primates; 2.4.1 Clustering of residues at 38% coverage. 2 Catarrhini; Hominidae; Homo. Function: Guanine nucleotide exchange factor (GEF) for RAP1A, 3 Notes on using trace results 2 RAP2A and MRAS/M-Ras-GTP. Its association with MRAS inhibits 3.1 Coverage 2 Rap1 activation. 3.2 Known substitutions 2 Subcellular location: Nuclear. 3.3 Surface 3 Alternative products: 3.4 Number of contacts 3 Event=Alternative splicing; Named isoforms=2; Name=1; 3.5 Annotation 3 IsoId=Q92565-1; Sequence=Displayed; Name=2; IsoId=Q92565-2; 3.6 Mutation suggestions 3 Sequence=VSP 007616; Note=No experimental confirmation availa- ble; 4 Appendix 3 Tissue specificity: Widely expressed with highest levels in brain. 4.1 File formats 3 Similarity: Contains 1 N-terminal Ras-GEF domain. 4.2 Color schemes used 3 Similarity: Contains 1 Ras-GEF domain. 4.3 Credits 3 About: This Swiss-Prot entry is copyright. It is produced through a 4.3.1 Alistat 3 collaboration between the Swiss Institute of Bioinformatics and the 4.3.2 CE 4 EMBL outstation - the European Bioinformatics Institute. There are 4.3.3 DSSP 4 no restrictions on its use as long as its content is in no way modified 4.3.4 HSSP 4 and this statement is not removed. 1 Lichtarge lab 2006 Fig. 1. Residues 1-104 in 1wgyA colored by their relative importance. (See Appendix, Fig.4, for the coloring scheme.) 2.2 Multiple sequence alignment for 1wgyA For the chain 1wgyA, the alignment 1wgyA.msf (attached) with 5 sequences was used. The alignment was assembled through combi- nation of BLAST searching on the UniProt database and alignment using Muscle program. It can be found in the attachment to this report, under the name of 1wgyA.msf. Its statistics, from the alistat program are the following: Format: MSF Number of sequences: 5 Total number of residues: 516 Fig. 2. Residues in 1wgyA, colored by their relative importance. Clockwise: Smallest: 100 front, back, top and bottom views. Largest: 104 Average length: 103.2 Alignment length: 104 Average identity: 71% Most related pair: 93% Most unrelated pair: 43% Most distant seq: 46% Furthermore, 37% of residues show as conserved in this alignment. The alignment consists of 80% eukaryotic ( 80% vertebrata) sequences. (Descriptions of some sequences were not readily availa- ble.) The file containing the sequence descriptions can be found in the attachment, under the name 1wgyA.descr. 2.3 Residue ranking in 1wgyA The 1wgyA sequence is shown in Fig. 1, with each residue colored according to its estimated importance. The full listing of residues in 1wgyA can be found in the file called 1wgyA.ranks sorted in the attachment. 2.4 Top ranking residues in 1wgyA and their position on the structure In the following we consider residues ranking among top 38% Fig. 3. Residues in 1wgyA, colored according to the cluster they belong to: of residues in the protein (the closest this analysis allows us to red, followed by blue and yellow are the largest clusters (see Appendix for get to 25%). Figure 2 shows residues in 1wgyA colored by their the coloring scheme). Clockwise: front, back, top and bottom views. The importance: bright red and yellow indicate more conserved/important corresponding Pymol script is attached. residues (see Appendix for the coloring scheme). A Pymol script for producing this figure can be found in the attachment. Table 1. 2.4.1 Clustering of residues at 38% coverage. Fig. 3 shows the cluster size member top 38% of all residues, this time colored according to clusters they color residues belong to. The clusters in Fig.3 are composed of the residues listed continued in next column in Table 1. 2 Table 1. continued the interface, as well as how many of them are realized through the cluster size member backbone atoms (if all or most contacts are through the backbone, color residues mutation presumably won't have strong impact). Two heavy atoms red 30 12,13,14,15,17,20,23,24,32 are considered to be “in contact” if their centers are closer than 5A˚ . 33,34,36,39,40,41,50,52,53 54,65,66,68,83,85,86,87,88 3.5 Annotation 92,93,94 If the residue annotation is available (either from the pdb file or blue 2 79,80 from other sources), another column, with the header “annotation” yellow 2 101,102 appears. Annotations carried over from PDB are the following: site (indicating existence of related site record in PDB ), S-S (disulfide Table 1. Clusters of top ranking residues in 1wgyA. bond forming residue), hb (hydrogen bond forming residue, jb (james bond forming residue), and sb (for salt bridge forming residue). 3.6 Mutation suggestions 3 NOTES ON USING TRACE RESULTS Mutation suggestions are completely heuristic and based on comple- 3.1 Coverage mentarity with the substitutions found in the alignment. Note that Trace results are commonly expressed in terms of coverage: the resi- they are meant to be disruptive to the interaction of the protein due is important if its “coverage” is small - that is if it belongs to with its ligand. The attempt is made to complement the following some small top percentage of residues [100% is all of the residues properties: small [AV GST C], medium [LP NQDEMIK], large in a chain], according to trace. The ET results are presented in the [W F Y HR], hydrophobic [LP V AMW F I], polar [GT CY ]; posi- form of a table, usually limited to top 25% percent of residues (or tively [KHR], or negatively [DE] charged, aromatic [W F Y H], to some nearby percentage), sorted by the strength of the presumed long aliphatic chain [EKRQM], OH-group possession [SDET Y ], evolutionary pressure. (I.e., the smaller the coverage, the stronger the and NH2 group possession [NQRK]. The suggestions are listed pressure on the residue.) Starting from the top of that list, mutating a according to how different they appear to be from the original amino couple of residues should affect the protein somehow, with the exact acid, and they are grouped in round brackets if they appear equally effects to be determined experimentally. disruptive. From left to right, each bracketed group of amino acid types resembles more strongly the original (i.e. is, presumably, less 3.2 Known substitutions disruptive) These suggestions are tentative - they might prove disrup- One of the table columns is “substitutions” - other amino acid types tive to the fold rather than to the interaction. Many researcher will seen at the same position in the alignment. These amino acid types choose, however, the straightforward alanine mutations, especially in may be interchangeable at that position in the protein, so if one wants the beginning stages of their investigation. to affect the protein by a point mutation, they should be avoided. For example if the substitutions are “RVK” and the original protein has 4 APPENDIX an R at that position, it is advisable to try anything, but RVK. Conver- 4.1 File formats sely, when looking for substitutions which will not affect the protein, one may try replacing, R with K, or (perhaps more surprisingly), with Files with extension “ranks sorted” are the actual trace results. The V. The percentage of times the substitution appears in the alignment fields in the table in this file: is given in the immediately following bracket. No percentage is given • alignment# number of the position in the alignment in the cases when it is smaller than 1%. This is meant to be a rough • guide - due to rounding errors these percentages often do not add up residue# residue number in the PDB file to 100%. • type amino acid type 3.3 Surface • rank rank of the position according to older version of ET • To detect candidates for novel functional interfaces, first we look for variability has two subfields: residues that are solvent accessible (according to DSSP program) by 1. number of different amino acids appearing in in this column 2 at least 10A˚ , which is roughly the area needed for one water mole- of the alignment cule to come in the contact with the residue. Furthermore, we require 2.
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